2023 | Sustainability Report

SUSTAINABILITY 2023 REPORT

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Message from Management Management 1. Overview This year we celebrate Kiewit's 140th anniversary. Through decades of Summit (Pg. 61) and Thurgood Marshall College Fund Immersion Program About Kiewit change, our growth has been driven by long-term strategic vision and (Pg. 63), and reimagine how we train our newly hired entry-level engineers Sustainability at Kiewit a commitment to doing business the right way. (Pg. 73), there were a lot of exciting developments at Kiewit last year. It’s Our Projects We’ve grown from a small masonry contractor in Omaha, Nebraska, to important work that we continue to build upon to ensure the long-term being one of North America’s largest and most respected construction and success of our organization. 2. Governance engineering firms, serving eight major markets. The same entrepreneurial I’m proud to work alongside this generation of Kiewit leaders and Corporate Governance employees. We’re guided by our Core Values – People, Integrity, Supply Chain spirit that led to our expansion beyond vertical building into public infrastructure nearly 100 years ago, is evident in Kiewit teams tackling Excellence and Stewardship – and committed to doing what’s right for 3. Environmental the increasingly complex energy transition and infrastructure projects our all our stakeholders, including employees, clients, business partners Environmental Stewardship communities need today. and the communities we support. Greenhouse Gases & You can see this long-term vision not only in our expansion into new On behalf of everyone at Kiewit, thank you for reading our 2023 Energy Consumption markets and geographies, but also in the way we operate our business. Sustainability Report. 4. Social When our Kiewit predecessors began requiring hard hats in the 1940s and Health & Safety full-time safety supervisors on projects in the 1950s, it was considered RICK LANOHARICK LANOHA Diversity, Equity & Inclusion forward-thinking. Today, using data-driven solutions to predict and prevent President and Chief Executive O昀昀icer Talent & Workforce safety incidents that could happen on our jobs is changing the way we Development train our people to ensure Nobody Gets Hurt. Community Engagement In this report, we share highlights from throughout 2023 about what we Appendix design and build and how we operate our business. From the continued e昀昀orts to reduce the carbon impact of our equipment fleet (Pg. 44), diversify our workforce through programs like our Future Women in Kiewit 2222

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Overview Development Community Engagement About Kiewit / Appendix Sustainability at Kiewit / 1Our Projects / 3333

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT About Kiewit Message from Management Kiewit is one of North America’s largest and most respected construction and engineering organizations. 2023 REVENUE2023 REVENUE 2023 EMPL2023 EMPLOOYEEYEESS 1. Overview Our roots date back to 1884 when we got our start as a About Kiewit masonry contractor in Omaha, Nebraska. 11 7.7.11 31,31,100100 Sustainability at Kiewit Today, we o昀昀er construction and engineering services Our Projects in a variety of markets including transportation; BILLIONBILLION EMPLEMPLOOYEEYEESS oil, gas and chemical; power; marine; water; building; 2. Governance industrial; and mining. Corporate Governance ENGINEERING NEWENGINEERING NEWSS-RE-RECORD RANKINGSCORD RANKINGS Kiewit is one of the largest privately held, employee- Supply Chain owned firms in North America. We value our reputation 3. Environmental as a true meritocracy. #2#2 #1#177 Environmental Stewardship We operate through a network of subsidiaries in the TTOP 400OP 400 TTOP 500OP 500 United States, Canada, Mexico and Guam. CONTRACONTRACCTTORSORS DEDESIGN FIRMSSIGN FIRMS Greenhouse Gases & Energy Consumption 4. Social ON-ON-SITE RANKINGSITE RANKING Health & Safety Diversity, Equity & Inclusion #7#7 Talent & Workforce TTOP 40OP 40 Development CONTRACONTRACCTTORSORS Community Engagement IN CIN CANADANADAA Appendix 4444

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20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Sustainability Mission sMission sttaattemenement:t: WWe are are building fe building for North or North AmericaAmerica’s fut’s futururee. . WWe conduce conductt our business in a wour business in a waay thay that sust susttains the naains the natturural enal envirvironmenonment, the prt, the prosperiosperittyy Message from Management at Kiewit oof our emplof our employyees and communiees and communities and our economic grties and our economic groowwth.th. Our Sustainability program is defined under three core pillars – Environmental, Social and Governance – with a defined 1. Overview objective and material topics for each pillar. About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & ENVIRONMENTAL SOCIAL GOVERNANCE Energy Consumption Be responsible stewards of the environment Ensure the safety, wellbeing and success Conduct our operations responsibly and 4. Social and pursue opportunities to operate our of our workforce, business partners and with integrity to build a stronger organization Health & Safety business more sustainably communities for future generations of Kiewit employees Diversity, Equity & Inclusion Talent & Workforce MAMATERIALTERIAL T TOPICSOPICS MAMATERIALTERIAL T TOPICSOPICS MAMATERIALTERIAL T TOPICSOPICS Development Community Engagement ■ Environmental Stewardship ■ Health & Safety ■ Corporate Governance Appendix ■ Greenhouse Gases & Energy ■ Diversity, Equity & Inclusion ■ Supply Chain Consumption ■ Talent Development ■ Community Engagement 5555

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & Sustainability Governance Sustainability Committee Energy Consumption Consistent with our core values, Kiewit has a strong Responsibility for the ongoing planning and and provides progress reports and assessments to the record of upholding high standards of governance, ethics, implementation of the company’s sustainability program Executive Committee, which in turn informs and consults 4. Social compliance and risk management. Our governance belongs to Kiewit’s Sustainability Committee. This group with the company’s Board of Directors. The foundation Health & Safety framework for sustainability begins with our Board of operational and functional leaders includes on which Kiewit’s sustainability program is built is the Diversity, Equity & Inclusion Executive Committee, which is responsible for the direction representation from construction and engineering company’s compliance and risk management programs, Talent & Workforce and oversight of our programs and strategic e昀昀orts. The operations, accounting, communications, compliance, which provide operations and legal governance on key Development Executive Committee is ultimately responsible for how we corporate giving, environmental, equipment, human areas of business- and project-specific risks. Kiewit manage sustainability and ESG-related issues and risk. resources, legal, safety, supply chain and procurement, performs periodic reviews, enterprise risk assessments and Community Engagement technology and other key disciplines. The Sustainability project-specific risk identification and mitigation measures Appendix Our Sustainability Policy outlines our sustainability pillars Committee, under oversight of the Executive Committee, to supplement and enforce its compliance programs. and how this commitment is further supported through defines Kiewit’s sustainability material topics, identifies our Core Values and additional policies to ensure key strategies and deliverables, and analyzes data to make sustainability principles in our company. This includes informed decisions to ensure continued progress toward addressing how we work with our supply chain partners our sustainability goals. This committee meets monthly to drive sustainable practices. 6666

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Our Projects MarkMarkeettss BuildingBuilding 4%4% Message from Management We’re building for North America’s future. We partner with our clients to deliver projects that improve IndusIndustrialtrial 2%2% 1. Overview livelihoods. Our goal is to transform our construction MarineMarine 10%10% and engineering expertise into projects that have a MiningMining 2%2% About Kiewit positive impact on the quality of life in communities Sustainability at Kiewit across North America — today and in the future. Oil, Gas & ChemicalOil, Gas & Chemical 22%22% Our Projects PowePowerr 23%23% The diversity across our projects in terms of the 2. Governance markets we serve, contract size, contract model TTrransportansportaationtion 26%26% and geographic location, helps ensure the long-term WaWatteerr 11%11% Corporate Governance stability of our business. Supply Chain Highlighted on the following pages are some of the ConContrtracact Sizt Sizee 3. Environmental projects awarded, underway or completed by Kiewit teams in 2023. These projects demonstrate how Kiewit, < $< $1M1M 3%3% Environmental Stewardship alongside our clients, is helping to improve livelihoods Greenhouse Gases & in the communities where we work and live. $$1-1-10M10M 21%21% Energy Consumption $$10-50M10-50M 10%10% 4. Social $50-$50-100M100M 28%28% Health & Safety $$100-100-250M250M 10%10% Diversity, Equity & Inclusion > $250M> $250M 28%28% Talent & Workforce Development Community Engagement DelivDelivery Modelsery Models Bid BuildBid Build 40%40% Appendix CMGCCMGC 13%13% Design Build/EPCDesign Build/EPC 42%42% DesignDesign 5%5% 7777

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 259259 MORE THANMORE THAN 1. Overview WWAATER PROJETER PROJECCTTS S 66,200 MW,200 MW 40+40+ COMPLETED OR IN PROGRECOMPLETED OR IN PROGRESSSS About Kiewit SINCE SINCE 20201919, T, TOOTTALING ALING MORE THANMORE THAN OF SOLAR PROJEOF SOLAR PROJECCTTS S HYDROGEN PROJEHYDROGEN PROJECCTTS S Sustainability at Kiewit $$11.11.5 BILLION 5 BILLION COMPLETED OR IN PROGRECOMPLETED OR IN PROGRESSSS EEXEXECUTEDCUTED Our Projects SINCE 20SINCE 201919 IN IN CONTRACONTRACCTT V VALALUEUE 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion 129 MILE129 MILESS Talent & Workforce 98 98 OF BEAOF BEACH RENOURISHMENTCH RENOURISHMENT Development 75+75+ RAILRAIL PROJE PROJECCTTSS PROJEPROJECCTTSS AND AND Community Engagement CCARBON MANAARBON MANAGEMENTGEMENT COMPLETED OR IN PROGRECOMPLETED OR IN PROGRESSSS 77,,4449 A49 ACRECRES S Appendix PROJEPROJECCTTS AS AWWARDEDARDED SINCE SINCE 20201919, T, TOOTTALING ALING MORE THANMORE THAN IN IN THE THE LALASSTT THREE THREE YEARSYEARS $$1313..7 BILLION 7 BILLION OF MARSH HABITOF MARSH HABITAATT IN IN CONTRACONTRACCTT V VALALUEUE CREACREATED OR RETED OR RESSTTORED ORED SINCE 20SINCE 201919 8888

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Behavioral Health & Wellness Center at Children’s, Nebraska Message from Management Under the leadership of the Mental Health Innovation Foundation, Kiewit Building Group Inc. 1. Overview is leading the design-build process for the new Behavioral Health & Wellness Center at Children’s, About Kiewit located on the campus of Children’s Nebraska Sustainability at Kiewit in Omaha. Our Projects The 107,250-square-foot, four-story mental health 2. Governance center for ages 5-18 will increase mental health services for children, adolescents and young adults. Corporate Governance The state-of-the-art facility will include 38 single- Supply Chain occupancy inpatient beds, a partial hospitalization program, outpatient consultation o昀昀ices, an 3. Environmental outpatient eating disorder program, and a crisis assessment and triage center, which will be the Environmental Stewardship first of its kind in the region. The RiverFront, Nebraska Between all three parks, there are more than 150,000 Greenhouse Gases & plants and trees scattered throughout, five children’s Energy Consumption Other world-class features include indoor activity In 2023, the final phase of the Omaha RiverFront play areas, five acres of grass lawn, a pedestrian space so children can participate in physical Revitalization project was completed, wrapping overlook and ten miles of pedestrian walkways and 4. Social activity year-round, enhanced safety and security up more than four years of construction on three paths. And that’s just a handful of new features. features and dedicated sta昀昀 spaces to promote city parks. Health & Safety wellness and reduce fatigue. Each existing park was completely removed and built Diversity, Equity & Inclusion Heartland of America Park in Downtown Omaha back from scratch. Kiewit Infrastructure Co. was the Talent & Workforce Work began in 2023 and the new facility will open now features a 100,000-square-foot event lawn, construction manager for the 72-acre project. Development in early 2026. space for rollerblading and ice skating in the winter Community Engagement and an amphitheater. A pedestrian bridge connects visitors from the FIRSFIRSTT PROJE PROJECCTT Appendix Heartland of America Park to Lewis and Clark IN NEBRAIN NEBRASKASKA TTO EARNO EARN Landing, where families can enjoy a destination ENVISIONENVISION children’s playground, an urban beach and the CERCERTIFICTIFICAATIONTION Kiewit Luminarium. The first phase of the project, the Gene Leahy Mall, opened in the summer of 2022. FROM FROM THE INSTHE INSTITUTE FTITUTE FOROR SUSSUSTTAINABLE INFRAAINABLE INFRASSTRUCTRUCTURETURE 9999

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Living Breakwaters, New York In response to Superstorm Sandy, the Living also provide a range of habitat spaces for oysters, Message from Management Breakwaters project on the southern shoreline of fin fish and other marine species. Kiewit Corporation Staten Island, launched by the U.S. Department of subsidiary Weeks Marine, Inc. is part of a multi- Housing and Urban Development (HUD), will provide disciplinary team and is responsible for the transportation 1. Overview a multifaceted approach to reducing and reversing and placement of the breakwater materials. About Kiewit the damaging e昀昀ects of erosion and storm waves. The program is an innovative coastal green infrastructure Weeks deployed a W537 Equilibrium crane, accompanied Sustainability at Kiewit by floating amphibious excavators and barges to Our Projects that will also serve to improve the ecosystem health of Raritan Bay, encourage stewardship of coastlines construct this armored coastal infrastructure which and generally enhance people’s experience of the is composed of rubble mound (rock) structures with 2. Governance shoreline in this part of Staten Island. a stone core, a base layer (bedding stone or marine Corporate Governance mattress, depending on the breakwater) and outer Houston Ship Channel Supply Chain Consisting primarily of 2,400 linear feet of near-shore layers consisting of armor stones and ecologically breakwaters, partially submerged structures built of enhanced concrete armor units. Once the breakwaters Expansion — Project 11, Texas 3. Environmental stone and ecologically-enhanced concrete units, this are constructed, the Billion Oyster Project will install live In 2023, Kiewit Corporation subsidiary Weeks infrastructure will reduce and eventually reverse the oysters to inhabit the “reef ridges” and “reef Marine, Inc. continued work on the Port of Environmental Stewardship negative impact of erosion and storm waves, and will streets” creating a diverse marine habitat environment. Houston’s Project 11. The project involves Greenhouse Gases & widening 8.3 miles of the Houston and 4 miles of Energy Consumption the Bayport ship channels using Weeks’ 30-inch 4. Social hydraulic cutter dredge, the C.R. McCaskill, in one of the nation’s busiest waterways. Health & Safety Diversity, Equity & Inclusion Weeks is using the dredging material to construct 3 Bird Island, a marsh habitat in Trinity Bay. When Talent & Workforce complete, the 3 Bird Island will create 6 acres Development of new bird habitat, 5.4 acres of oyster reef and Community Engagement 11,550 linear feet of armored dikes connecting each of the three points of the island. Appendix The completion of this project enhances Port Houston’s capacity to handle more cargo and larger ships and contributes to the conservation and restoration of local wildlife habitats. 10101010

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects Genera Sustainable Biomaterials Rodeo Renewable Fuels Facility, South Fork Offshore 2. Governance Campus, Tennessee California Wind, New York Corporate Governance In 2023, TIC - The Industrial Company, a subsidiary Cherne Contracting Corporation, a subsidiary of Kiewit Construction of the first American-built o昀昀shore wind Supply Chain of Kiewit Corporation, was announced as the engineering, Corporation, is the primary general contractor for the substation was completed at the Kiewit O昀昀shore Services procurement and construction contractor for the expansion Rodeo Renewable Fuels project. To meet the growing facility in Ingleside, Texas in 2023. The 1,500-ton, 60-foot 3. Environmental of Genera's existing Sustainable Biomaterials Campus. demand for renewable fuels, the client is converting a tall structure then traveled across the Gulf of Mexico and Environmental Stewardship refinery into one of the world’s largest renewable fuels up to the East Coast for installation at the South Fork The 150,000-square-foot expansion will increase plants, with the capacity to produce 800 million gallons Wind project site. The substation now resides on a Greenhouse Gases & manufacturing, production and distribution operations of per year of renewable diesel, gasoline and sustainable monopile foundation within the wind farm, collecting Energy Consumption Genera’s circular, compostable packaging solutions and aviation fuel. This project will reduce the plant’s greenhouse power produced by the wind turbines and connecting it biomaterials. The expansion will provide space for more gas emissions by 50% to enable the client to meet local to the grid. 4. Social than 60 robotic thermoforming machines, autonomously regulations and standards. South Fork Wind is the first completed utility-scale o昀昀shore Health & Safety guided vehicles and automated packaging lines. Diversity, Equity & Inclusion The project scope includes constructing new facilities wind farm in federal waters and will be New York’s first The sustainable packaging is for food and consumer for renewable feedstocks handling, pre-treatment and o昀昀shore wind farm. It can power 70,000 New York homes Talent & Workforce products, retail and food service. The products are treatment, reconfiguring hydro-processing, utilities and each year with clean energy. Development created from locally grown regenerative grasses instead Community Engagement tankage. Mass. Electric Construction Co., a subsidiary of of plastic alternatives. Kiewit Corporation, is also involved on the project. Appendix FIRSFIRSTT Read more about Rodeo Renewable Fuels Facility AMERICAMERICAN-BUILAN-BUILTT in Kieways OFFOFFSHORESHORE WIND WIND SUBSSUBSTTAATIONTION 11111111

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects Madison Fields Solar, Ohio Gemini Solar and Storage, Nevada Electric Bus Infrastructure, 2. Governance Texas The Madison Fields Solar Project in Pike Township in In 2023 Kiewit Power Constructors Co. completed its Corporate Governance Madison County, Ohio — about 30 miles west of Columbus EPC contract for Primergy’s Gemini project outside of In 2022, Houston Metro received funding to purchase Supply Chain — is a 234-megawatt solar-powered generating facility. Las Vegas, Nevada. Gemini includes a 967-MW solar farm 20 electric buses. This was Houston Metro's first step It’s located on 1,100 acres of a 1,932-acre project area and and a 380 MW, four-hour battery energy storage system. It towards procuring only zero-emission buses by fiscal 3. Environmental is expected to generate power for up to 35,000 households. is one of the largest solar facilities in the U.S. The project is year 2030. To accommodate the new electric buses, Environmental Stewardship Working with project owner Savion Energy, Kiewit Power carefully sited on less than 7,000 acres. upgrades were required at Houston Metro’s Kashmere, Greenhouse Gases & Constructors Co. started an EPC contract in November Polk and Westpark bus operating facilities. 2022. The project reached completion in December 2023. The project included placing almost 15,000 racks and Energy Consumption over 1,790,000 solar modules. Additional scope included Mass. Electric Construction Co. (MEC), a subsidiary The project scope included 15 miles of access roads to constructing a multiple 34.5kV overhead collection circuit of Kiewit Corporation, installed 20 Heliox Flex 180KW 4. Social the power blocks, driving 80,000 piles to support the that will tie the new solar field back to the substation. chargers, 26 charger columns and four Heliox 50 KW Health & Safety racking system that holds and tracks the photovoltaic (PV) mobile chargers at three bus operating facilities. The modules, installing 420,000 bifacial PV modules to produce Gemini has the capacity to power 260,000 homes during scope of work included installing all underground duct Diversity, Equity & Inclusion super peak periods. power, running over 2 million linear feet of DC and AC banks, foundation work, equipment installation, testing Talent & Workforce cable and placing 45,000 linear feet of permanent fencing. and commissioning support and all other associated Development infrastructure work to support the Heliox chargers. The Community Engagement work was completed in 2023. ONE OF ONE OF THE LARGETHE LARGESSTT SOLAR SOLAR Appendix FFAACILITIECILITIES IN S IN THE UTHE U.S.S.,., As an organization, Kiewit continues broader e昀昀orts Read more about the Madison Fields Project WITH THE WITH THE CCAPAPAACITCITYY T TO O POPOWER WER UP TUP TOO to support transit agencies during their transition from in Kieways 260260,,000 000 HOMEHOMESS diesel to zero emissions buses. 12121212

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Highway 5 Reinstatement, British Columbia November 15, 2023, marked the two-year anniversary of 4,500 native plants at these sites to help return the Message from Management the atmospheric river and subsequent historic flooding environment to its natural landscape. and landslides that caused extensive damage to Highway 5, also known as the Coquihalla Highway, in British This project was completed in an alliance model 1. Overview Columbia. Less than two years after the historic event, partnership between Kiewit, the Ministry of About Kiewit all final permanent bridges opened to public tra昀昀ic in Transportation and Infrastructure and Emil Anderson permanent four-lane configuration. Construction (EAC) Inc., providing design and Sustainability at Kiewit re-construction of the infrastructure far more quickly Our Projects Work included new bridges at three sites. Crews than conventional bid-build or design-build models. Chicago Transit Authority (CTA) and local Indigenous communities planted around Congress Blue Line Repair, Illinois 2. Governance Chicago Transit Authority’s Blue Line is a 24/7 Corporate Governance rapid train service connecting Downtown Chicago Supply Chain The project received the 2023 PMI Large and Mega Project Award from the Project Management Institute. This prestigious with the Illinois Medical District. honor recognizes project management practices, innovation, working with partners across multiple sectors and the team 3. Environmental making positive impacts to the community through this project’s recovery work. In 2023, Kiewit Infrastructure Co. crews completed the first phase of the CTA’s Forest Park Branch Environmental Stewardship Rebuild, a multi-year, multi-phased investment Greenhouse Gases & to make service faster, safer, more reliable and Energy Consumption accessible for all riders. 4. Social Once the CTA shut down the rail line in late July, our crews immediately began working around the Health & Safety clock to meet the tight schedule. The UIC Halsted Diversity, Equity & Inclusion Station and subway were quickly returned to Talent & Workforce service one month after the outage began, and the Development remaining work was completed just in time for the Community Engagement big marathon in Chicago. Appendix Read more about the CTA Congress Blue Line Repair in Kieways 13131313

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit The project was recognized with an Engineering News-Record Our Projects Mid-Atlantic Award of Merit in Airport and Transit. 2. Governance Coastal 29, Washington WMATA Yellow Line Repairs, Tres Rios Wastewater Corporate Governance Kiewit Infrastructure West Co.'s scope of work on the Washington, D.C. Reclamation Facility (WRF), Arizona Supply Chain Coastal 29 project includes correcting 29 fish passage After eight months of safety and critical construction Kiewit Infrastructure West Co. is building a new biosolids barriers. The barriers hinder fish from moving up or repairs, Washington Metropolitan Area Transit Authority’s solar drying facility in Tucson, Arizona, that will be a model 3. Environmental downstream. Correcting these barriers will help with (WMATA) Yellow Line rail reopened to residents in 2023. of sustainability. Environmental Stewardship salmon recovery, restore access to fish habitats and comply with the federal injunction. This train service crosses the Potomac River between The facility is for the Pima County Regional Wastewater Greenhouse Gases & Virginia and downtown D.C. faster and includes travel to Reclamation Department at its Tres Rios Wastewater Energy Consumption The project is broken into five di昀昀erent bundles, with Ronald Reagan Washington National Airport. Reclamation Facility (WRF). The project will reduce 4. Social one or two bundles being built each summer. The team the volume of biosolids while producing higher-quality completed construction on Bundle 1 in 2023, which The 24/7 Yellow Line construction started in September Class A biosolids, which are among the most sought out Health & Safety consists of six di昀昀erent sites. With each site, crews have 2022. Leak mitigation started quickly to enable the for compost and fertilizer with no restrictions. Diversity, Equity & Inclusion to move tra昀昀ic by detouring drivers onto existing roads necessary structural repairs to the tunnel as well as stop or constructing a temporary road bypass around the site. the major tunnel water infiltration. The project will also use 100% renewable resources, Talent & Workforce Then, they install a temporary stream bypass, remove utilizing thermal and solar technologies to maximize Development More than 1,000 individual steel plates were welded into waste heat recovery. It is expected to be complete by Community Engagement the existing culvert and install a new culvert, which the deteriorated sections of the steel tunnel, and over opens up water flow and allows for fish migration. the end of 2024. 14,000 new bolts were installed at steel flanges and ribs. Appendix Work concludes with construction of new stream habitat and roadway restoration. Bridge work over the Potomac included the replacement of 88 deteriorated bearings, a new fire suppression system, new bridge grounding systems and the replacement of critical communication cables and devices. 14141414

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Prospect Lake Clean Water Center, Florida Message from Management In 2023, Kiewit Water Facilities Florida Co. was selected to design and build the Prospect Lake 1. Overview Clean Water Center in Fort Lauderdale, Florida. A groundbreaking ceremony took place in early 2024. About Kiewit Sustainability at Kiewit This new water treatment plant will deliver the majority of fresh water for the city and replace Our Projects an existing 70-year-old plant. It will feature state-of-the-art technology and produce 50 million 2. Governance gallons of water per day. It’s also designed to Corporate Governance withstand a Category 5 hurricane. Construction is Supply Chain expected to be complete by 2026. 3. Environmental Environmental Stewardship Salton Sea Species Conservation Habitat, California Greenhouse Gases & At the Salton Sea, California’s largest lake, drought and will have been covered, suppressing dust, and providing Energy Consumption evolving water agreements have caused water levels to much-needed habitat for wildlife. recede and salinity to increase. More lakebed is being 4. Social exposed, impacting both wildlife and humans. Fewer fish Excavated material was used to build embankments can survive in the saltier water, reducing the available and form a wetland habitat. The habitat includes three Health & Safety food source for birds, and increased dust from the large ponds of varying water levels, ranging from a few Diversity, Equity & Inclusion exposed lakebed causes harmful pollution. To address inches to 10 feet. A new diversion structure diverts water Talent & Workforce these concerns, the Salton Sea Management Program from the New River to mixing basins, where it is mixed Development (SSMP) was created as part of California’s strategic plan with water that’s pumped from the Salton Sea, before Community Engagement to improve environmental conditions at the Salton Sea. entering the habitat’s ponds. Appendix Kiewit Infrastructure West Co. is the design-build contractor for the Species Conservation Habitat (SCH), the first of many projects in the SSMP. Read more about the Salton Sea Species When the SCH project is complete, 4,000 acres of Conservation Habitat in Kieways exposed lakebed at the southern end of the Salton Sea 15151515

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT A leading carbon management solutions provider Message from Management 175+175+ Through the emergence of e昀昀ective carbon management 1. Overview solutions, government policies and incentives, and other carbon management market drivers, many power, industrial and oil, gas & engineering staff About Kiewit chemical (OGC) facilities have the potential to reduce Sustainability at Kiewit their carbon dioxide emissions significantly, with many Our Projects targeting reductions of 95 percent. 75+75+ Kiewit has experience supporting projects across the carbon management projects 2. Governance carbon management spectrum. This includes carbon awarded in the last 3 years Corporate Governance capture to prevent CO from entering the atmosphere, 2 carbon removal to neutralize CO that has already entered Supply Chain 2 the atmosphere, and bio-energy with carbon capture and 3. Environmental sequestration (BECCS) for a carbon-negative solution. 1010 Environmental Stewardship Our experience supporting carbon management projects pilots and first-of-a-kind ranges from initial studies through full engineering, OEM-sponsored or Greenhouse Gases & DOE-funded CO projects Energy Consumption procurement, construction (EPC) contracts. We have 2 worked with top corporations in the power, industrial 4. Social and OGC markets to deploy carbon management strategies across a variety of industries. 80+ MILLION80+ MILLION Health & Safety metric tons engineered per Diversity, Equity & Inclusion Importantly, our long-standing relationships with best- annum of CO captured and Talent & Workforce in-class technology providers for commercially proven 2 CO2 removed Development technologies allows us to provide the best solution for Community Engagement all facility types. Working closely with each client’s selected technology provider, our engineers account for 8 MILLION8 MILLION Appendix the unique elements of each technology throughout the design phases to optimize constructability in the field metric tons process across and e昀昀iciency during facility operations. industrial, power and OGC markets 16161616

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Governance Community Engagement Appendix Corporate Governance / Supply Chain / 2 171717171717

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Corporate Governance Message from Management CorCore Ve Valuesalues Over the years, we have refined these principles into a set of core values built around our People, Integrity, Excellence Learn more about our Core 1. Overview Kiewit has thrived on a strong foundation of principles and Stewardship. CORE since our inception. As our company evolves, we must VALUES Values: Core Values Handbook About Kiewit address that the environment in which we operate is Our Core Values help drive ethical and sustainable Sustainability at Kiewit more global, diverse and complex. business decisions — decisions that are right for our Our Projects company, employees, clients, partners and communities. Our principles provide us guidance when we are faced Values remain our company’s cornerstone and, along with 2. Governance with changing elements and ethical questions. Along with their expected behaviors, these values clarify relevant company policies, are the sum of our business and communicate our view, passed from one generation to ethics conduct, including how we operate as a responsible Corporate Governance the next, about how to do the right thing. Today, our Core and engaged corporate citizen. Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & PEOPLE EXCELLENCE Energy Consumption 4. Social INTEGRITY STEWARDSHIP Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 18181818

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20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects PEOPLE INTEGRITY EXCELLENCE STEWARDSHIP 2. Governance We care for the well-being of our We conduct our business to the We commit to excellence in all We preserve Kiewit’s unique culture Corporate Governance people and help them grow in their highest ethical standards and take we do with a focus on quality and to build a stronger organization for ability to be successful. responsibility for our actions. continuous improvement. future generations of employees. Supply Chain EXPECTED BEHAVIORS EXPECTED BEHAVIORS EXPECTED BEHAVIORS EXPECTED BEHAVIORS 3. Environmental ■ We begin everything with safety. ■ We deal fairly with everyone ■ We seek to be the best in ■ We prosper by managing Environmental Stewardship in an honest and everything we do. to our values. Greenhouse Gases & ■ We make our health and that of our families a priority. straightforward manner. ■ We deliver the highest value ■ We make a positive impact Energy Consumption ■ We treat everyone with dignity ■ We honor our commitments. to our clients with a sense on our communities. 4. Social and respect. ■ We avoid conflicts of interest. of urgency. ■ We develop each new Health & Safety ■ We train and mentor at all levels. ■ We adhere to the laws, ■ We encourage new ideas and generation of leaders. regulations and policies seek continuous improvement. ■ We never sacrifice long-term Diversity, Equity & Inclusion ■ We communicate in an open, Talent & Workforce constructive and candid manner. governing our activities. ■ We are competitive and goals for short-term gain. Development ■ We refuse to make or solicit welcome a challenge. ■ We embrace the principles ■ We support each other’s e昀昀orts Community Engagement as one team. improper payments. ■ We are entrepreneurial and of broad-based employee ■ We maintain operational and demonstrate initiative in seeking ownership. Appendix financial records accurately new opportunities. ■ We conduct our business and truthfully. ■ We build our work right the in a sustainable manner. first time and meet or exceed client expectations. 19191919

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Company Policies Our Sustainability Policy outlines our sustainability pillars If we suspect or are aware of misconduct, or if we have a and how this commitment is further supported through question about what is the right thing to do, we use any of In addition to our Core Values, our employees are our Core Values and additional policies to ensure the following resources: Message from Management expected to conduct business pursuant to our corporate sustainability principles in our company. This includes policies and procedures. These policies and procedures addressing how we work with our supply chain partners ■ Contact management and/or the Legal department 1. Overview include (but are not limited to) key areas of our to drive sustainable practices. ■ Report through the Compliance Reporting Line; sustainability program. available 24/7 for people to report concerns and issues About Kiewit Our Human Rights Policy applies to our employees and Sustainability at Kiewit ■ Environmental the companies with which we do business via our Vendor There is no tolerance for retaliation at Kiewit. Reports can Our Projects ■ Safety Code of Conduct. The policy outlines expectations for be made anonymously through our reporting line, and ■ Anti-Harassment and Discrimination preventing human rights violations and reporting any every call received is reviewed and addressed. 2. Governance suspected violations of human rights, such as modern ■ Human Rights slavery, human tra昀昀icking and child/forced labor. Antitrust and anti-corruption trainings are topics included Corporate Governance ■ Anti-Bribery and Corruption, Antitrust in our annual compliance trainings for sta昀昀 employees. Supply Chain Ethical Behavior Kiewit projects undergo a standardized process to identify ■ Diversity Contracting specific compliance risks and to develop mitigation action ■ Sustainability We strive to know what’s expected of us to ensure we build 3. Environmental our work right the first time so that we meet and exceed plans. Depending upon the likelihood and severity of the risk, the mitigation action plan may include specific tasks Environmental Stewardship our clients’ expectations. We have policies, procedures and initiatives that safeguard this excellence. Keeping each designed to minimize risk. These associated tasks may Greenhouse Gases & include training, monitoring and/or additional procedures Energy Consumption Kiewit is an active and founding member other accountable is part of what we do. This means we must report perceived unethical or illegal behavior. It is our to address the risk. of the Construction Industry Ethics and 4. Social Compliance initiative. duty to Kiewit, our coworkers and our clients to report all suspected or actual violations of our Core Values, company Health & Safety policies or the law. Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 20202020

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Compliance Kiewit has always set a high standard to ensure its ■ Ensuring that regulatory agency visits, findings and 2023 Metrics Message from Management clients, partners and other key constituents know that notices of violations are reported to appropriate ethical and honest behavior is what they should expect managers for follow-up from every Kiewit employee. Kiewit sta昀昀 employees are 1. Overview 100% trained annually on job-specific compliance topics. Kiewit projects undergo a standardized process to identify Completion of Anti-Bribery About Kiewit Kiewit’s focus and commitment to compliance excellence specific compliance risks and to develop mitigation action and Corruption Training Sustainability at Kiewit helps separate us from the competition, while giving plans. Depending upon the likelihood and severity of Our Projects those we work with confidence that we are protecting the risk, the mitigation action plan may include specific their business as we protect our own. procedures to be followed to avoid or minimize the risk, 2. Governance training, monitoring methods and monitoring frequency. 100% The overall goal of Kiewit’s Compliance Program is to Corporate Governance help the company and its employees to comply with Our Corporate Compliance Council includes the chief Completion of Supply Chain regulatory requirements that apply to the company’s compliance o昀昀icer, who is also an executive vice president Antitrust Training business and operations. The program includes and member of the Board of Directors, the chief legal 3. Environmental e昀昀icient and e昀昀ective company controls that ensure o昀昀icer and chief financial o昀昀icer. The council meets three compliance with laws, regulations, contract requirements, times a year to review the program with other company Environmental Stewardship policies and procedures, and is fundamentally responsible stakeholders and provide oversight and guidance to ensure 100% Greenhouse Gases & for the following: the program is e昀昀ective. The council reports to the board Energy Consumption of directors twice a year. Items discussed at the meetings Completion of ■ Providing a process through which projects can include regulatory matters (new and in process), company Core Values Training 4. Social identify and mitigate compliance risks and develop policies and procedures, and other items related to a mitigation action plan for those risks regulatory compliance, ethics, and Core Values. Health & Safety Diversity, Equity & Inclusion ■ Tracking assessments performed by our operating business units to evaluate the e昀昀ectiveness and 100% Talent & Workforce execution of the plan Development Completion of Diversity Community Engagement Contracting Training Appendix 21212121

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Board of Directors reviewing the company’s annual audited and interim unaudited financial statements); the audit process; and the BoarBoard od of Dirf Dirececttororss Kiewit’s Board of Directors consists of 14 directors who independent auditor’s qualifications and independence. Message from Management serve annual terms. As a privately owned company, the The Audit Committee also is responsible for appointing the InIntternal Dirernal Dirececttororss Board consists of directors who are or were employed by company’s independent auditor, which in 2023 is KPMG Richard A. Lanoha 1. Overview Kiewit — internal directors — and also external directors. LLP. The Compensation Committee reviews and approves President and Chief Executive O昀昀icer Board Committees all compensation to be paid to employee-directors; and Bruce E. Grewcock About Kiewit reviews and approves the ownership of the company’s Sustainability at Kiewit The Board has an Audit Committee, a Compensation securities by the employee-directors. The Executive Chairman Our Projects Committee and an Executive Committee. The Audit Committee exercises, to the maximum extent permitted Kenneth E. Stinson Committee consists of two or more external directors by law, all powers of the Board between Board meetings, Chairman Emeritus 2. Governance to help the board fulfill its oversight responsibilities for except those functions assigned to specific committees. H.E. (Hank) Adams Corporate Governance the company’s financial reporting process (including Walter L. (Ben) Bentley Supply Chain David A. Flickinger William D. (Doug) Glaser 3. Environmental Gregory A. Hill Environmental Stewardship David J. Miles Greenhouse Gases & Thomas S. Shelby Energy Consumption 4. Social EExxtternal Dirernal Dirececttororss Neil W. Du昀昀in Health & Safety Diversity, Equity & Inclusion Lynn L. Elsenhans Talent & Workforce Michael R. McCarthy Development Douglas R. Oberhelman Community Engagement Appendix 22222222

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Strategies Our Projects ■ Screen suppliers against social and 2. Governance Supply Chain environmental criteria ■ Outline vendor, supplier and Corporate Governance subcontractor expectations in a Vendor Supply Chain ObjecObjectivtive:e: Ensur Ensure re responsibleesponsible This team of 400 professionals provides expertise to Code of Conduct enenvirvironmenonmenttal and social pral and social pracacticestices develop and maintain strong relationships with vendors, ■ Provide diverse, small and local business 3. Environmental wiwithin our supply chainthin our supply chain troubleshoot issues e昀昀iciently and share knowledge to enterprises an equal opportunity to Environmental Stewardship support all of Kiewit’s projects across North America. participate in the performance of our Our projects are supported by thousands of suppliers, clients' projects Greenhouse Gases & subcontractors and vendors each year. Kiewit Supply Kiewit is committed to conducting business with Energy Consumption the highest integrity and in compliance with all Network manages the supply chain for goods and 4. Social services needed for our operations, from highly applicable laws. Health & Safety technical equipment and materials to o昀昀ice supplies. Our Vendor Code of Conduct (VCC) outlines the of all tiers, and each of their respective employees Diversity, Equity & Inclusion expectations for vendors, suppliers and subcontractors and any other third parties involved with the execution Talent & Workforce of Kiewit’s work. Development Our intent is to provide diverse, small and local Community Engagement 2023 Metrics business enterprises an equal opportunity to participate in the performance of our clients’ projects. Appendix 12% Our commitment to supplier diversity provides $1,068,055,756 Percentage of overall the structure to ensure that all available business Spent with DBE firms — U.S. spend that went enterprises have an equal opportunity to compete to DBE firms for and participate in the work on the project. 23232323

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT 2023 Highlights ■ We issued an updated Vendor Code of Conduct to ■ We implemented process improvements for analyzing ■ We updated the supplier page on Kiewit.com to Message from Management clarify expectations related to anti-money laundering spend with disadvantaged business enterprises (DBE) provide a more user-friendly experience for suppliers. and the procurement of wood products. across the United States. The improvements allow This webpage o昀昀ers many resources to our partners to for more streamlined reporting on a project and streamline our business interactions. It includes state- 1. Overview ■ We continue to implement process improvements for corporate basis. of-the-art solutions to simplify the way suppliers and About Kiewit tracking spend with Indigenous suppliers in Canada subcontractors interact with the organization, from to enable more streamlined reporting on a project ■ We began developing sustainability training for our Sustainability at Kiewit Kiewit Supply Network personnel and intend to begin finding diverse supplier opportunities to expediting and corporate basis. invoice payments. Since its launch, we’ve analyzed Our Projects training in 2024. feedback and will continue to prioritize continuous ■ We engaged key suppliers to better understand how improvement of this webpage. Our goal is to improve 2. Governance CODE OF our supplier relationships can be leveraged to support access and accessibility to information as we Corporate Governance CONDUCT View our Vendor Code of Conduct our sustainability e昀昀orts. We will continue to refine strengthen partnerships in our supply chain. Supply Chain our approach to collecting qualitative and quantitative feedback from these vendors, specifically targeting ■ We worked with diversity organizations to support those that supply materials with the most significant local networking events and engage with suppliers. 3. Environmental environmental footprint. Read more beginning on Pg. 25. Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 24242424

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Featured Stories Environmental Stewardship Greenhouse Gases & Project team adapts to meet supplier diversity goals Energy Consumption The San Fernando Groundwater Basin Remediation Project The project had a goal to ensure 15% small business trucking, potholing and tra昀昀ic control. They laid the 4. Social consists of two plant sites: North Hollywood Central and enterprise/disabled veteran business enterprise groundwork for multiple construction scope quote Tujunga Well Field Response Action Treatment Facilities. (SBE/DVBE) utilization over the term of the contract. solicitations as design progressed. Health & Safety San Fernando is part of Los Angeles Department of Water The project exceeded this goal, with SBEs and DVBEs Diversity, Equity & Inclusion and Power's (LADWP’s) comprehensive, long-term plan accounting for more than $75 million in contracts. The team adjusted to continue their outreach online Talent & Workforce to remove contaminated groundwater at sites across through the worst of the COVID-19 pandemic, including Development the 175-square-mile San Fernando Groundwater Basin, The project received its notice to proceed in November additional events hosted by the City and County of Los Community Engagement enhance drinking water production and reduce imported 2019. Initial supplier diversity events were held in person, Angeles, US Veteran Business Alliance and the National water dependence. Pumping and treating this vast supply including participation at a U.S. Veteran Business Alliance Association of Minority Contractors, SoCal chapter. When Appendix of groundwater over the next 20 to 30 years will remove Event and City of Los Angeles Matchmaking Event. the team was awarded the construction scope in fall of and prevent migration of contaminants, restore beneficial These events kicked o昀昀 early community engagement 2020, they were ready to award contracts. More than 70 use of the basin and contribute to the improvement of and opportunities to educate xBEs on the nuances of the xBE subs and vendors contributed to the project’s supplier public health in this densely populated area. It is LADWP’s progressive design-build model. The outreach activities diversity program. Certified participating firms included: inaugural progressive design-build project. helped identify subcontractors and vendors to perform small, women-owned, minority-owned, disabled-veteran- design support scopes like geotechnical services, owned and disadvantaged business enterprises. 25252525

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Continuous relationship building ■ Women’s Business Enterprise National Council Our participation with these groups includes sponsoring with supplier diversity organizations (WBENC) and attending events hosted by the organizations 1. Overview and associations in the U.S. ■ Conference of Minority Transportation O昀昀icials and serving in leadership positions on boards. As an About Kiewit (COMTO) example, in June, Kiewit hosted the Mountain Plains Throughout 2023, Kiewit teams engaged with many national, Minority Supplier Development Council for a Nebraska Sustainability at Kiewit regional and local organizations focused on supplier diversity, ■ Hispanic Contractors of Colorado (HCC) Diversity Business Luncheon. More than 60 attendees Our Projects including – but not limited to – those listed below. ■ BuildOut California joined in our auditorium facility to hear from the chapter's ■ National Minority Supplier Development Council ■ TriState Minority Supplier Development Council – leadership, local businesses representatives and 2. Governance Nashville, Tennessee members of University of Nebraska at Omaha faculty. Corporate Governance ■ Mountain Plains Minority Supplier Development Council The event included panel discussions, presentations ■ National Veterans Business Development Council ■ Mid-South Minority Business Continuum – and networking opportunities. Supply Chain Memphis, Tennessee (NVBDC) 3. Environmental ■ Golden Triangle Minority Business Council (GTMBC), Inc. – Beaumont, Texas Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Partnering with industry peers to Health & Safety connect with Denver’s supplier included a listening session allowing the small business Diversity, Equity & Inclusion community during Construction representatives to tell the general contractors what they Talent & Workforce Inclusion Week should know about working with them. Development In October, Kiewit joined many of our peers in the general Kiewit employees assisted in planning the event, Community Engagement contracting community in Denver, Colorado, to participate participated and networked with attendees, and helped in a Supplier Diversity Summit. The event took place during facilitate sessions. Appendix Construction Inclusion Week. The Supplier Diversity Summit was an opportunity for small and diverse suppliers to network with many large general contractors in one place. The agenda included breakout sessions on topics like bidding and managing risk. It also 26262626

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Engaging nationally and regionally In 2023, Kiewit and its employees supported COMTO by: with the Conference of Minority ■ Attending COMTO’s national annual conference 1. Overview Transportation Officials (COMTO) ■ Engaging local and regional chapters in the About Kiewit Kiewit is proud to support the Conference of Minority communities where we work, including attending Bembry leads the CITY committee, which sponsored six Sustainability at Kiewit Transportation O昀昀icials (COMTO), the leading national and sponsoring chapter events interns in 2023. Through her engagement with the national Our Projects advocate for employment diversity, inclusion and ■ Serving as members on local chapter boards committee beginning in 2012, Bembry has helped mentor contracting opportunities in the multi-modal, multi-billion- over 100 student interns. Bembry has a special connection 2. Governance dollar transportation industry. We have invested Colean Bembry, a quality manager with Mass. Electric to the CITY Program — she began her career with Mass as a corporate partner at the national level, enabling us Construction Co., a subsidiary of Kiewit Corporation, Electric Construction Co. in 2006 as a CITY intern. Corporate Governance to further our support of COMTO’s national programming, continued her long-time service as the national chair Kiewit Infrastructure Engineers Business Development Supply Chain initiatives, and key events, while deepening our visibility of COMTO Careers in Transportation for Youth (CITY) and engagement with diverse leaders and businesses in & Strategy Director Kelli Kelly also supported the program 3. Environmental Internship Program. The CITY Program provides minority by hosting a webinar with the CITY interns. The the transportation industry. undergraduate and graduate students with a unique paid workshop included guidance on conduct in a professional Environmental Stewardship opportunity to gain professional and practical experiences environment, professional attire and communication. Greenhouse Gases & in the transportation industry. Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 27272727

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories Message from Management CONTINUEDCONTINUED 1. Overview Building relationships with survey and recording skills. The course is five days long One of the monitors joined the project’s Craft Voice in Indigenous communities in Canada and includes daily classroom and field components. Safety (CVIS) program. About Kiewit Sustainability at Kiewit In Canada, we value our relationships with local Indigenous Upon successful completion, participants are registered communities, as demonstrated on the Highway 5 project in with the province and receive a certificate signed by the The monitors worked closely with Kiewit to identify areas Our Projects British Columbia and the Little Long Dam and Smoky Falls Archaeology Branch. for inclusion of Indigenous culture onsite. 2. Governance Safety Projects in Ontario. The RISC training o昀昀ered by the project team built ■ On National Indigenous Peoples Day, an Indigenous Corporate Governance Highway 5 Reinstatement, long-term capacity of the Indigenous community members Elder visited the site to share stories with the team. who attended by providing opportunities for them to Kiewit acknowledged National Day for Truth & Supply Chain British Columbia perform similar roles on future projects. The course was Reconciliation, with everyone wearing orange shirts 3. Environmental The Highway 5 project was located in the traditional conducted at full capacity and was the best attended designed by a local First Nation artist. territories of the Nlaka’pamux, Stó:lō, and Syilx People. training course provided. ■ Prior to work on the Juliet Creek site, an Elder from Environmental Stewardship the community of Coldwater Band visited the job site Greenhouse Gases & Employment & Training Kiewit engaged with local Indigenous communities to provide employment opportunities. As a result, 10.5% to say a prayer over the water and the fish. He shared Energy Consumption Kiewit worked closely with the local Indigenous the history of an ancient trail used by their ancestors communities to identify training opportunities that would of the total labour hours worked on the project were by Indigenous employees. and traders that existed through this area hundreds of 4. Social support access to jobs in the construction industry. This years before the Coquihalla Highway existed. Health & Safety included inviting community members to on-site training Subcontracting and hosting trainings specifically for community members. Kiewit awarded 30% of the $83 million total value of Following the project’s completion, a meeting was held Diversity, Equity & Inclusion Kiewit visited the local First Nation community of Nooaitch with the Indigenous monitors and the project management Talent & Workforce subcontracts equaling $25.2 million to Indigenous to provide small tools training as well as hosted first aid businesses and partners. Scopes awarded included team to gain feedback. The monitors commented that Development training in the local town of Merritt, BC. Highway 5 was the best project they had worked on as they Community Engagement medics, trucking and waste disposal. Through engagement with communities, the project team felt respected and valued as part of the project team. The learned that many members were interested in Resources Indigenous Monitors monitors suggested a weekly meeting between monitors Appendix Monitors from the local communities were onsite daily and the construction team for future projects, which has Information Standards Committee Archaeological and at each of the bridge locations. In consultation with the CMT Inventory Training for Crew Members (RISC Training), been implemented on the Highway 1 Nicomen Project. however, the tuition was a barrier. The project team o昀昀ered monitors and communities, the project team ensured that this training to local community members at no cost. The there was clear communication and processes on the project that respected the wishes of the local communities. 'Building relationships with Indigenous RISC Training course teaches basic site identification, communities in Canada' continued on next page 28282828

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED In addition to project-level engagement, we are Message from Management aligned with the following national organizations: 1. Overview About Kiewit Sustainability at Kiewit Our Projects Canadian Council for Aboriginal Business 2. Governance (CCAB): Kiewit is registered as a Committed Member of the CCAB Progressive Aboriginal Corporate Governance Relations (PAR) certification program. The Supply Chain PAR program demonstrates a company’s commitment to prosperity in Indigenous 3. Environmental communities and confirms corporate performance in Indigenous relations. Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Little Long Dam and Smoky Falls Dam Safety Projects, Ontario Health & Safety The Little Long Dam and Smoky Falls Dam Safety Projects Scopes included aggregate and sand supply, Diversity, Equity & Inclusion for Ontario Power Generation are improving dam safety security and fencing, road maintenance, camp Talent & Workforce on the Lower Mattagami River in Ontario. The Little Long supply and maintenance, concrete supply, busing First Nations Major Project Coalition (FNMPC): Development project consists of expanding and rehabilitating the existing and tree clearing. Kiewit is a Sustaining Partner of FNMPC. FNMPC Community Engagement Adams Creek spillway to increase overall spill capacity. ■ At the end of 2023, 48 First Nations craft were is national non-profit organization established to The Smoky Falls project includes the rehabilitation of working on the project. A total of 200,000 hours advance First Nation equity positions in major Appendix the spillway and sluiceway structures at the 100-year-old of 2 million total hours have been worked by projects across Canada. As a Sustaining Partner, Smoky Falls Generating Station. The projects are located in First Nations employees, including sta昀昀, craft and Kiewit participated in the Annual Conference and Moose Cree First Nation territory. subcontractors. a panel talk on BC Hydro’s Call for Power. ■ The project has awarded approximately $85 million in ■ The project team participated in and sponsored the subcontracts to Indigenous businesses and partners. Summer 2023 Moose Cree Gathering of our People. 29292929

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Environmental Community Engagement Appendix Environmental Stewardship / Greenhouse Gases & Energy Consumption / 3 30303030

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Environmental Stewardship Message from Management ObjecObjectivtive:e: Conduc Conduct our business in an ent our business in an envirvironmenonmenttally susally susttainable mannerainable manner Strategies ■ Track all environmental incidents and 1. Overview The projects we build are found in urban, suburban Our corporate environmental leadership, environmental evaluate environmental incident trends About Kiewit and rural areas across the U.S., Canada and Mexico. managers across North America, and on-site to use lessons learned to improve Each new location has its own unique surroundings, environmental specialists on every project lead these environmental training and performance Sustainability at Kiewit Our Projects from open fields to dense neighborhoods. We take our e昀昀orts and work to train all employees to ensure they ■ Improve tracking water use and reuse on role as environmental stewards seriously, and work to understand rules, regulations and expectations for our projects and in our o昀昀ices 2. Governance understand our surroundings on each new site. our work. We frequently engage third-party experts ■ Improve tracking waste generation and We’re diligent in our e昀昀orts to build responsibly to support our internal environmental professionals. disposal on our projects and in our o昀昀ices Corporate Governance Supply Chain and monitor the impacts of our work. We track all Their expertise on sensitive environmental matters, ■ Complete project waste diversion studies environmental incidents, evaluate trends and use like endangered species protection, helps ensure we each year 3. Environmental these lessons to improve our training and ultimately operate responsibly. ■ Coordinate environmental stewardship our overall performance. We continue to improve our volunteer activities in our communities Environmental Stewardship Our focus on environmental stewardship also extends Greenhouse Gases & data collection processes to improve understanding to our o昀昀ice facilities. We continue to identify and ■ Manage o昀昀ice recycling programs Energy Consumption of our environmental performance and identify demonstrate opportunities to improve our operating ■ Manage project recycling programs opportunities for continuous improvement. Further, e昀昀iciencies and minimize the environmental footprint ■ Minimize the use of single-use plastics in 4. Social under the company's environmental compliance of our o昀昀ice operations. our o昀昀ices Health & Safety program, we conduct annual reviews of company ■ Pilot the use of recycled materials on our Diversity, Equity & Inclusion projects and facilities. construction projects Talent & Workforce Development Community Engagement Appendix 3131

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview 2023 Progress About Kiewit Sustainability at Kiewit Projects Our Projects ■ We continued to partner with clients, subcontractors ■ We completed waste diversion studies on a ■ At our Kiewit Headquarters and Kiewit University and other third-parties to execute our project- transportation project and solar project. The intent is shared cafeteria facilities, we reintroduced reusable 2. Governance based environmental management programs. Some to identify waste diversion best practices for projects dishes and utensils as an option for food service. Corporate Governance examples of these e昀昀orts begin on Pg. 33. of similar scopes. These studies were done early in the O昀昀ering reusable plates, cups and silverware is Supply Chain ■ Project teams are empowered to identify and project lifecycle, which allows more time to implement an opportunity to minimize waste and cost. We implement new ideas for how to build our work, which recommended improvements. Regular waste diversion also introduced composting with a goal of further 3. Environmental often results in environmental and other benefits. studies help us continue to build up a database of minimizing the amount of waste produced in the Beginning on Pg. 36, read about a few such practices vendors that can support our projects. kitchen facility. Environmental Stewardship on our projects that minimized environmental impacts. ■ Our Envision Community of Practice grew to ■ Over the past several years, we have made significant Greenhouse Gases & include nearly 60 employees from across the changes to our real estate portfolio to better serve our Energy Consumption ■ We’re improving how we measure water use and reuse on our projects. To pilot these processes, we organization. This group meets regularly to discuss employees and operate more e昀昀iciently. One important 4. Social were intentional to select some of our largest projects best practices and lessons learned for projects standard is the use of demountable wall systems. which are likely to have the highest overall water seeking Envision certification from the Institute This allows us to reconfigure o昀昀ice space with less Health & Safety consumption. We also selected a major project in the for Sustainable Infrastructure. waste. In 2023, many o昀昀ice upgrades were made using Diversity, Equity & Inclusion Southwest U.S., where water scarcity is an important these systems. Talent & Workforce issue in our communities. The intent is to continue Offices ■ In Omaha, Nebraska, we acquired an o昀昀ice facility Development to define reporting processes and get more projects ■ We’re improving how we measure water use and formerly occupied by another company. We began Community Engagement engaged in formally tracking their water consumption multistream recycling at our fixed facilities. We the process of relocating employees from an existing and reuse each year. regularly review data provided by our recycling facility we leased to this new facility. On Pg. 37, Appendix ■ We continued to increase the number of projects vendors. Based on these reports, there is opportunity read how we are prioritizing sustainability as we collecting waste and recycling data. The intent is to to improve how much waste is diverted and recycled. make the move. continue to define reporting processes and get more We continue to engage our vendors and facility projects engaged in formally tracking their waste coordinators to discuss opportunities for improvement. generation and disposal each year. 3232

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories Message from Management Protecting the desert tortoise in the Nevada desert 1. Overview In the Nevada desert, Kiewit Power Constructors crews on Primergy’s Gemini solar project are responsible About Kiewit for following protective measures in coordination Sustainability at Kiewit with Primergy and third-party consultants to project Our Projects the endangered tortoise and its habitat. Some of the measures implemented include: 2. Governance ■ Tortoise fence keeps any tortoise that makes it back Corporate Governance to the construction site from getting into work areas. Supply Chain The fence is installed in a 12-inch trench, whereas typical silt fence would sit in a 4- to 6-inch trench. 3. Environmental ■ Tortoise crossings go underneath roadways and Environmental Stewardship provide tortoises with safe passage. Greenhouse Gases & ■ 360-walk-arounds are required before getting into Energy Consumption any vehicles or equipment to ensure no tortoises are in harm’s way. A 15 mile per hour speed limit is 4. Social also in place. Health & Safety Diversity, Equity & Inclusion Gemini’s Environmental team covers environmental protective measures in detail during onboarding for sta昀昀, Talent & Workforce craft and subcontractors. Development Community Engagement Training delivery drivers also became a big emphasis for Gemini. Many arrive to make deliveries to both Kiewit and Appendix the client, Primergy. Fliers in both English and Spanish help inform the drivers of requirements such as the 15 mile per hour speed limit, 360-walk-arounds, and the importance of ensuring vehicles stay on marked paths. Tortoise crossing Tortoise fence 3333

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Protecting snakes – and people – A creative solution minimizes After a thorough review, the prototype was approved. in the Nevada mountains waste and creates animal habitat It turned out, the prototype materials are better for the owls than the materials in initial plans. The prototype Message from Management In a mountainous region of Nevada, venomous snakes The Kiewit Infrastructure West Co. team on the Salton was made of concrete and those material properties are often spotted on a large solar project site. Some of Sea Species Conservation Habitat Project found a are better suited for temperature regulation and 1. Overview the measures implemented by the team in coordination creative reuse for excess electrical pull boxes that breathability than the wood or plastic which were with the client and third-party consultants to protect would have otherwise gone to a landfill. part of the initial habitat plans. About Kiewit workers and snakes include: Sustainability at Kiewit The boxes, which were either surplus or damaged, The project team built one extra artificial habitat, ■ Everyone on the job wears snake chaps as a were used to create artificial burrowing owl habitat which will be used as an educational piece during Our Projects barrier to keep snake fangs from penetrating skin installed on site. The burrowing owl is native to the community engagement events. in the event of a bite. region where the project is located. Some habitat had 2. Governance to be disrupted during the project, but a commitment ■ The phrase “Kick it before pick it” reminds workers Corporate Governance to check for rattle snakes prior to picking up solar was made to create two artificial habitats for every one Supply Chain panels. The vibration from a quick kick can stir that was displaced. up the snakes and alert workers of their presence. A field engineer noticed the electrical pull boxes on site 3. Environmental ■ Environmental awareness and compliance is one day and had the idea to use one for a prototype for Environmental Stewardship reviewed during onboarding for sta昀昀, craft the artificial burrowing owl habitat. First, a hole was cut Greenhouse Gases & and subcontractors. into each side of the pull box. Next, pipe left from the Energy Consumption project’s dewatering operations were connected to use as tunnels to access the habitat inside the boxes. Gap 4. Social filler foam was used to fill in cracking that had made the pull boxes defective for their original intended use. Health & Safety A new fiberglass lid was installed to allow access to the Diversity, Equity & Inclusion habitat for maintenance as needed. Talent & Workforce Development The next step was to review the prototype with Community Engagement project partners. That include the ornithologist – a person who studies Appendix or is an expert on birds – who works for the subcontractor overseeing biological monitoring and permit compliance, and California Department of Fish and Wildlife, which is responsible for maintaining the habitat when the project is complete. 3434

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT One project’s commitment to environmental stewardship includes 30 sheep and a cemetery Message from Management TIC – The Industrial Company, a subsidiary of Kiewit 1. Overview Corporation, reached substantial completion of Dominion Energy’s Piney Creek solar project in Virginia on Aug. About Kiewit 15, 2023. From early permitting and site clearing, to final Sustainability at Kiewit stabilization, the project team had many environmental Our Projects priorities on the project. Pictured left: This was the only legible tombstone the team discovered at the gravesite. It Planning and early works belonged to a former pastor of a local church, which is still active today. The church has been 2. Governance notified of the discovery. The project site was previously a re-plantable timber farm Pictured above: When viewing the site from above, you can see where solar arrays were Corporate Governance where pine trees were grown and then harvested every repositioned – circled in black on the image – to avoid disturbing a cemetery that was Supply Chain 10 years. The team found an opportunity to go beyond discovered when work began. contractual requirements and clear the site in a more 3. Environmental environmentally friendly manner. All the pine trees were Environmental Stewardship harvested and sent to a mill to make plywood, lumber and impacted solar block was redesigned to ensure habitat for pollinators. After restabilization, the entire chips. Then all the remaining roots were cleared and sent the cemetery site remained accessible and undisturbed. footprint of the project is a mix of grass stabilization, Greenhouse Gases & to either a wood mill to make plywood or to a wood-fired Energy Consumption Welcome to the (solar) farm pollinator species and the exterior forest. power plant nearby. 4. Social As blocks of solar panels became mechanically complete, Where possible, natural vegetation was used as a bu昀昀er vegetation beneath them needed to be maintained. Health & Safety instead of a silt fence. Instead of fencing the entire site, the Dominion shared a best practice from its existing solar Diversity, Equity & Inclusion team only fenced around the arrays. The remaining areas facilities: have sheep graze the land instead of mowing it. were left natural and easier to navigate for native animals The project team worked with a local farmer to bring 30 Talent & Workforce like bears and deer. The team leaned on outside experts to Development sheep to the site. The farmer continued to provide care help with bird and bat surveys to ensure compliance with for the sheep. Community Engagement contractual and permitting requirements. Restabilization Appendix An unexpected find As the project reached its final stages, attention turned When work began, signs of a previously undisclosed to achieving 100% stabilization of the site. cemetery were found. The team worked with the client, Virginia Department of Historical Resources, and a local Referring to best practices to identify native plants and Sheep graze beneath operating solar panels at the Piney Creek archaeological expert to evaluate and secure the area. The pollinators in Virginia, the team established a beneficial project in Virginia. 3535

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Treating process water for beneficial reuse on the Gross Reservoir Expansion Project On the Gross Reservoir Expansion Project, Kiewit Barnard The process water is directed down the dam's face to a Message from Management JV is raising the height of Denver Water’s Gross Reservoir water catch basin behind a cut-o昀昀 wall. The water is then Dam by 131 feet, taking it from an existing height of 340 feet pumped from the basin to treatment tanks, where the pH 1. Overview to a new height of 471 feet. This will increase the storage of level and turbidity are adjusted and filtered as needed. the reservoir from 42,000 to 119,000 acre-feet. Then, the treated water is pumped from the treatment About Kiewit tanks to an onsite water tower for dust control use. Sustainability at Kiewit Two operations on the project generated large quantities Our Projects of process water – hydrodemolition and wire saw cutting. Over the course of two years, 4.6 million gallons of water was treated and reused on site, with a peak treatment of ■ Hydrodemolition is a concrete removal technique 60,000 gallons of water per shift. 2. Governance using high-pressure water to remove deteriorated Corporate Governance and sound concrete as well as asphalt and grout. The alternative to the Beneficial Use Permit allowing Supply Chain At Gross Reservoir, a hydrodemolition subcontractor the process water to be treated for dust control use, removed an average of 2-3” of depth of concrete would’ve been to truck water to an o昀昀-site treatment 3. Environmental from the face of the dam. This was necessary to facility. This alternative would have increased tra昀昀ic in ensure that roller compacted concrete (RCC) – which the canyon, leading to increased emissions and increased Environmental Stewardship will be used to raise the dam – will bond to the face safety concerns. Greenhouse Gases & of the existing dam. Energy Consumption ■ Diamond wire sawing is a sawing method used in complex construction and demolition projects. On this 4. Social project, wire saws were used to remove concrete from 4.6 MILLION Health & Safety the existing ogee at the top of the dam. This required GALLONS OF WATER Diversity, Equity & Inclusion more than 14,000 square feet of cutting to remove TREATED FOR REUSE ON SITE Talent & Workforce nearly 100 pieces of block from a 350 cubic yard mass. MINIMIZING TRUCK TRAFFIC, Development Working closely with Colorado Department of Public Health EMISSIONS AND SAFETY CONCERNS Community Engagement & Environment (CDPHE) and Boulder County, the team developed a cohesive plan to collect and treat the process Appendix water used for these operations. This included getting a Beneficial Use Permit from CDPHE. Stakeholders worked together to determine the relevant parameters for testing, treatment, record keeping and reporting. 3636

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects Offsetting construction impacts by Reusing equipment wash water to On the move: Prioritizing furniture 2. Governance building birdhouses near bridges in minimize water consumption reuse during office relocation British Columbia Keeping equipment clean is an important part of In Omaha, Nebraska, we purchased a new facility to serve Corporate Governance preventative maintenance plans and environmental as o昀昀ice space for more than 900 employees in our business, Supply Chain The Bottletop, Juliet and Jessica bridges along British Columbia’s Highway 5 had to be demolished and rebuilt stewardship. It is more challenging to inspect and repair technology, data services and procurement departments. 3. Environmental to repair damage stemming from a November 2021 equipment if it is dirty. This facility replaces leased space we had outgrown. atmospheric river and subsequent flooding. All our fixed equipment and maintenance repair facilities We’re prioritizing reusing as many furnishings as possible Environmental Stewardship have equipment wash water recycling systems which during the transition into the new o昀昀ice. This includes both Greenhouse Gases & Barn Swallows – a species listed as Special Concern Energy Consumption under the Species at Risk Act – used the girders filter water for reuse. what we owned and used in the leased space we’re underneath the existing bridges for nesting habitat. vacating, and furniture and fixtures that were purchased Bird netting was installed on the girders of all the bridges We have 12 portable equipment wash water stations for with the new o昀昀ice space. 4. Social use on projects. These systems are transferred around to prevent birds from nesting prior to demolition. the company as needed to support our equipment Some materials are being reused locally. Additional Health & Safety Diversity, Equity & Inclusion Six new birdhouses – two per bridge set – were built maintenance operations. In these systems, microbes furniture and fixtures are being be sent to Kiewit project to o昀昀set the impact on habitat that demolishing the treat the water so that it can be continuously reused. sites throughout the country. As an example, 380 desk Talent & Workforce bridges would cause. Each birdhouse has the capacity Solids are easily separated to be disposed of properly. workstations have already been sent to project sites. Development for a minimum of 10 nests. Community Engagement If we cannot reuse furniture internally, we attempt to identify The scope was subcontracted to a local Indigenous opportunities to donate the material. As an example, several Appendix contractor from the Coldwater Indian Band. The hundred task chairs were donated to local thrift stores. houses were fabricated o昀昀site, adding benefit to the Reusing furniture, fixtures and materials has many benefits, local community. including environmental benefits of reducing the amount of waste in landfills and a reduction in the emissions embodied in the production of these materials. 3737

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT New relocation program has many A wastewater project diverts environmental benefits 27,000 nearly 6 million pounds of waste Message from Management Many of our people go where the work is, moving to POUNDS In 2022, we completed a waste diversion study project locations across North America. Our relocation on a wastewater treatment plant beginning 1. Overview program provides these employees with corporate OF MATERIAL DONATED construction operations. This study identified the resources and support to make these moves as TO LOCAL COMMUNITIES major waste streams that would be generated About Kiewit seamless as possible. on the project and potential recycling vendors in Sustainability at Kiewit the area. With this information, the project team In 2023, we implemented a new program through created a plan for a waste diversion program. Our Projects one of our relocation vendors, Home Sweet Home. The Discard & Donate program minimizes the amount Home Sweet Home’s Save a Tree, Plant a Tree program In 2023, reporting showed that the project 2. Governance of belongings an employee and their family ships for estimates the number of trees saved due to the diverted 96% of all waste generated throughout Corporate Governance their move. reduction in packaging. Then, for each tree a client the year. This amounted to nearly 6 million Supply Chain saves, Home Sweet Home plants three more on the pounds of waste. The largest waste streams Here’s how the program works. When an employee is client’s behalf. were concrete/rock/sand, sandblasting media, 3. Environmental preparing to move, they can elect to use the Discard scrap metal, wood and lumber pallets. & Donate service. Our relocation team arranges for a In 2023, Home Sweet Home calculated 17 trees saved Environmental Stewardship professional organizer to help the employee prepare by Kiewit employees using Discard & Donate, and 51 Construction on this project and the waste Greenhouse Gases & to move. The organizer helps identify household items additional trees were planted through the USDA Forest diversion program continue in 2024. Through Energy Consumption the employee may or may not want or need in their Service’s Plant-A-Tree-Program. the first two months of the year, 98% of waste new home. The unwanted items are donated to a local was diverted. 4. Social charity or discarded. Any old or unwanted electronics Health & Safety are recycled as part of the process. Diversity, Equity & Inclusion In 2023, Home Sweet Home calculated that Kiewit Talent & Workforce employees’ use of Discard & Donate resulted in: NEARLY Development ■ 27,000 pounds of material donated to local 6 MILLION Community Engagement communities POUNDS Appendix ■ 818 gallons of fuel consumption saved OF WASTE DIVERTED ■ Reduction of 2,000 pounds of packing materials ■ 8.09 metric tons of reduced CO emissions AND A 96% WASTE 2 DIVERSION RATE IN 2023 3838

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Go Green Committees promote sustainable practices and bring Supply Chain employees together to serve communities 3. Environmental Some of our o昀昀ice hubs have Go Green Committees, unnecessary lights and the Go Green Committee Environmental Stewardship which are focused on promoting sustainable practices in hosted a company-wide contest to encourage all aspects of our lives. The committees lead stewardship employee participation in Earth Hour. Greenhouse Gases & opportunities and provide education and awareness on Energy Consumption environmental sustainability topics. The Lenexa, Kansas, Go Green Committee hosted the 4. Social following activities in 2023: Here’s what the Omaha, Nebraska, Go Green Committee Health & Safety organized in 2023: ■ Seed collection – Employees collected seeds at Diversity, Equity & Inclusion Shawnee Mission Park to be replanted in the ■ A park clean-up during Kiewit Volunteers Month – 50 KC Area by KC WildLands. Talent & Workforce employee participants collected 239 pounds of waste Development at a park clean-up during Kiewit Volunteers Month. ■ An electronics recycling drive for America Recycles Community Engagement Day – 4,100 pounds of electronics were collected ■ An electronics recycling drive and clothing collection and diverted from landfills. drive for America Recycles Day – 2,314 pounds of Appendix electronics were recycled and 259 pounds of clothes In Lone Tree, Colorado, employees celebrated Earth were donated. Week with many activities, including a plant propagation ■ An Earth Hour observance – The Kiewit Headquarters swap, book swap, electronics recycling drive and building participated in Earth Hour by turning o昀昀 all recycled art contest. 3939

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Greenhouse Gases & Energy Consumption Message from Management ObjecObjectivtive:e: TTrrack and underack and underssttandand Building the infrastructure and energy projects our LED lighting and low E glass. We are also working to our grour greenhouse gas emissions andeenhouse gas emissions and communities depend on requires the input of people, understand the practicality of additional ways to lower our 1. Overview enerenergy consumpgy consumption, and idention, and identifytify equipment and materials. Our mobile equipment fleet energy consumption, like adding solar arrays to our owned and demonsand demonstrtraatte opporte opportuniunities tties too and fixed facilities are primary sources of scope 1 and 2 facilities. Standardizing furniture options allows us to better About Kiewit emissions for our construction operations. share and reuse materials across o昀昀ices and job sites. Sustainability at Kiewit rreduce our emissionseduce our emissions, t, to opero operaattee Our Projects our business wiour business with the loth the lowwesest carbont carbon We have a focused e昀昀ort on reducing the carbon impact Carbon emissions in construction materials are the ffooootprintprint prt pracactical.tical. of our equipment fleet. We work closely with equipment primary source of our scope 3 emissions. We are working 2. Governance manufacturers to select the most e昀昀icient and productive with our largest suppliers to improve our understanding machines to build our work. Through ongoing fleet of the largest sources of these emissions. Our project Corporate Governance replacements and modernization, we ensure best available teams are encouraged to think creatively to minimize the Supply Chain Strategies technology is incorporated into our equipment fleet. environmental footprint of our operations, including reusing Operator training is fundamental to our business, enabling materials. Subject matter experts continue to educate 3. Environmental ■ Continuously improve greenhouse gas safe, e昀昀icient and productive operations. themselves on the application of low carbon products. Environmental Stewardship emissions accounting methods We’re intentional about identifying opportunities to We are committed to continuous improvement of our data Greenhouse Gases & ■ Improve visibility of equipment idling minimize energy consumption at our fixed facilities. For collection processes to better understand the sources of Energy Consumption and compliance with company idling newly built and remodeled facilities, our standards call for our emissions. With better information, we can create policy features like white thermoplastic polyolefin (TPO) roofing, more informed strategies for reduction. 4. Social ■ Partner with major equipment Health & Safety suppliers to identify and demonstrate Diversity, Equity & Inclusion improvements to equipment technology Talent & Workforce ■ Evaluate opportunities to reduce Development energy consumption at our fixed Community Engagement facilities ■ Leverage machine data to optimize Appendix energy management strategies, including energy storage systems, alternative fuels and application of specific solutions 4040

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & 2023 Progress Energy Consumption ■ We continued to improve our data collection • 49 SUVS ■ We’re analyzing our tier 1 and tier 2 fixed facilities 4. Social processes for greenhouse gas emissions. See Pg. 42 to better understand the age and e昀昀iciencies of our • 21 electric utility task vehicles Health & Safety for more detail on how we improved data collection building systems. This includes assessing HVAC, processes in 2023. • 1 electric mini excavator mechanical and roofs for potential replacement, Diversity, Equity & Inclusion Talent & Workforce ■ We continued to partner with equipment suppliers • 1 lattice boom crawler crane which could lead to improved energy e昀昀iciencies. Development on the proper application of alternative-fueled ■ We continued to identify and demonstrate ■ In Omaha, Nebraska, we acquired a new o昀昀ice facility Community Engagement equipment, including battery electric, hydrogen and opportunities to operate equipment e昀昀iciently and formerly occupied by another company. On Pg. 37, advanced biofuels. See Pg. 44 for more examples of find other innovative operations solutions, to reduce read how we are prioritizing sustainability – including Appendix how we applied alternative-fueled equipment in our emissions and other environmental impacts. Specific energy e昀昀iciency – as we move employees into this organization in 2023. Our fleet of electric equipment examples are described on Pg. 43. new building. units as of the end of 2023 is shown here. ■ We're incorporating many sustainable features in our • 45 pickup trucks new building in Lenexa, Kansas, campus, including • 75 portable electric light plants solar panels and electric vehicle supply equipment. 4141

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT ImprImproovvemenementts ts to Gro Greenhouse Gas Emissions Colleceenhouse Gas Emissions Collection Prtion Processesocesses 2023 Metrics Kiewit acquired Weeks Marine Inc. on January 1, 2023. We track our scope 3 emissions for internal use. These Message from Management Throughout 2023, we worked to collect Weeks Marine's emissions are very complex in nature and more di昀昀icult for 683,433 scope 1 and scope 2 emissions into Kiewit Corporation’s us to control than scope 1 or 2 emissions. However, 1. Overview greenhouse gas reporting. Weeks Marine data is included we continue to work to track these emissions to the extent Scope 2Scope 2 in the reported greenhouse gas emissions inventory. possible to better understand the overall impact of our About Kiewit 73,866 operations. Some of the categories in scope 3 that we Sustainability at Kiewit We expanded our scope 1 and scope 2 boundaries to track include purchased goods and services, fuel- and include emissions from our operations in Mexico. energy-related activities, business travel, downstream Our Projects A team continued to meet monthly to review fuel transportation and distribution, use of sold products and, 2. Governance data quality and accuracy. This is important, as fuel downstream leased assets. Corporate Governance consumption is a primary driver of our scope 1 emissions. Our scope 1, 2 and 3 emissions were verified by a Supply Chain We engaged key suppliers to better understand how third party. our supplier relationships can be leveraged to support Biogenic emissions of CO from the combustion of biofuel 3. Environmental our sustainability e昀昀orts. We will continue to refine 2 in 2023 were: 15,394 metric tons of CO . our approach to collecting qualitative and quantitative 2 Environmental Stewardship Scope 1Scope 1 feedback from these vendors, specifically targeting Greenhouse Gases & 609,567 those that supply materials with the most significant Energy Consumption environmental footprint. 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix Greenhouse Gas Emissions MMeetrtric tic tons Cons COO22ee 4242

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories Message from Management Balancing earthworks and sourcing locally to reduce construction emissions On the Salton Sea Species Conservation Habitat project reduce the amount of earthwork needed for excavation Sourcing locally results in lesser distances traveled and 1. Overview in California, Kiewit Infrastructure West Co. crews moved and embankment operations. This 100% balanced reduced emissions. If the team had not engineered around About Kiewit 5 million cubic yards of material without any import. The earthwork operation improved productivity and reduced the locally available materials, the next closest aggregate Sustainability at Kiewit team optimized the configuration of habitat features to emissions. It also prevented the potential introduction of supplier would be 85 miles further haul distance one way. any invasive species onto the site. Our Projects That reduction in distance traveled was calculated to result During the design phase, the team committed to sourcing in the following savings over the life of the project: 2. Governance aggregates from a local supplier close to the job. Engineers MINIMIZING ■ 242,165 fewer gallons of diesel Corporate Governance FUEL CONSUMPTION designed rip rap slope protection to use aggregates and materials this supplier could provide. Creating an area of ■ Reduction of 2,571 metric tons of CO e emissions Supply Chain AND EMISSIONS 2 beach zone also reduced the amount of rip rap needed. BY BALANCING EARTHWORKS Finally, salvaging and reusing some existing rip rap on 3. Environmental site further reduced the amount of imported material. Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 4343

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Repowering derrick barges and generator and ESS. Short duration, but high demand spud other marine equipment with energy functions established the generator capacity. Engineering REPOWERING DERRICK BARGES 1. Overview storage systems (ESS) and procurement of the new hybrid power strategy WITH HYBRID SOLUTIONS TO occurred in 2023, with final installation onto the vessel in About Kiewit Our equipment fleet includes numerous floating derrick 2024. The new hybrid solution relies on a 65kW Tier 4 Final IMPROVE EFFICIENCY, Sustainability at Kiewit barges which are essential to marine work. We are generator combined with a 250kWh ESS and will o昀昀er REDUCE EMISSIONS, partnering with very well respected OEMs to modernize substantial operational cost savings. Our Projects many of these barges with energy storage systems (ESS). AND PROVIDE A While there are higher upfront costs for the battery QUIETER, CLEANER 2. Governance This e昀昀ort began with observations and studies to equipment and installation, we anticipate environmental ONBOARD EXPERIENCE Corporate Governance understand how the derrick barges operate with the benefits from increased generator e昀昀iciency, reduced fuel standard onboard diesel power plant. The load profile consumption and emissions, social benefits from a quieter Supply Chain modeling showed that the barges would be well suited for and cleaner onboard experience, economic benefits from ESS. The barges often cycle between a heavy load event for reduced operating costs and modernized operator controls. 3. Environmental a pick, dredge, swing or lower operation which requires a lot Environmental Stewardship of power, followed by idle time. This hybrid energy system Greenhouse Gases & supplies necessary power on demand without requiring Energy Consumption a generator sized for maximum output. Hybrid power is provided by battery only or in combination with 4. Social up to two Tier 4 Final diesel generators. Health & Safety In 2023, we began our e昀昀ort to repower our first derrick Diversity, Equity & Inclusion barge by initiating disassembly of the DB Pacific. It will be Talent & Workforce recommissioned in 2024. Our equipment and operations Development teams will monitor performance to gather data, best Community Engagement practices and lessons learned for repowering additional marine equipment in our fleet. We plan to repower Appendix additional derrick barges over the next few years. In addition to the derrick barges, we also recently installed a smaller diesel electric hybrid solution on our KP spud barge. After datalogging power consumption and load profiles from the KP spud barge, traditionally powered by a 410kW diesel generator, we simulated results with a much smaller 4444

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Solar panel installation will help offset energy consumption at one of Kiewit’s largest campuses 1. Overview Kiewit’s Lenexa, Kansas, o昀昀ice is home to nearly 1,700 worked closely with our Real Estate department to About Kiewit of the company’s employees who work primarily in the identify the best solution for rooftop solar on campus. Sustainability at Kiewit power and industrial markets in design engineering and construction roles. Construction is currently The panels will begin providing power to the campus Our Projects underway on a new building on campus, which will in 2024. It’s anticipated that anywhere from 8 to 11 allow for further growth. percent of overall campus electricity consumption 2. Governance could be o昀昀set by solar power. Corporate Governance In the past year, 506 solar panels were installed on the rooftops of the existing campus buildings, and We continue to assess the possibility of future solar Supply Chain more are planned for the new building currently under installations at our fixed facilities across North construction. A group of Kiewit's design engineers America, based on factors like weather patterns, 3. Environmental electricity costs and consumption trends. Using solar power to reduce Environmental Stewardship diesel consumption on remote Greenhouse Gases & jobsites Energy Consumption Every jobsite needs electrical power. For the 4. Social jobsites that are remote, o昀昀-grid solutions like generators or light plants which run on diesel are Health & Safety typically implemented. Maintaining o昀昀-grid diesel Diversity, Equity & Inclusion equipment requires costs in hours worked, fuel Talent & Workforce and emissions. Development Community Engagement On one project in the desert southwest, our equipment professionals designed and fabricated a Appendix solar power system on a 10' Conex box that powers HVAC, LED lighting, and 120 V and 240 V outlets. Eleven foldable solar panels were installed on the exterior faces of the Conex box and the system is rated at 4 kW. Up to seven more panels can be added to increase the rating. 4545

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Engaging externally to advance sustainability Collaborating with external groups and organizations best practices, including low carbon concrete strategies for Antommattei is an ACI Fellow and a member of its 1. Overview is one important way we help further industry progress di昀昀erent applications from design to construction on Kiewit board of directors. As an ACI member, Antommattei About Kiewit toward implementing more sustainable construction projects. Antommattei and other leaders are committed participates in many committees, including Committee Sustainability at Kiewit and engineering solutions. to understanding how changes to sustainability strategies 321: Durability Code and Committee 323: Low-Carbon Our Projects and materials to reduce carbon footprint of concrete Concrete Code. In Canada, he is the 1st Vice Chair of the Oscar Antommattei is Kiewit’s chief concrete may impact concrete properties, materials selection and CSA A23.1/A23.2: Requirements for Concrete Materials engineer and materials engineering director. He is a availability, constructability, strength development, long and Methods of Constructions/Test Methods and Standard 2. Governance member of Kiewit’s Chief Engineers Council (CEC), -term durability performance, field operations and more, Practices for Concrete. Antommattei is also the Kiewit Corporate Governance a fully-rounded organization with industry-recognized to help determine appropriate use cases. representative with the NIST Low Carbon Cements and Supply Chain subject matter experts representing all facets of work Concrete Consortium. across Kiewit’s markets. In addition to his leadership within Kiewit, Antommattei 3. Environmental has co-authored multiple papers about concrete types “It takes a lot of di昀昀erent contributors to successfully In this role, Antommattei works closely with internal and facilitated technical training on concrete topics deliver construction projects and it’s important that Environmental Stewardship colleagues to provide subject matter expertise on all for numerous industry groups throughout North America. contractors and design engineers – like Kiewit – are part Greenhouse Gases & things concrete. This includes continuing to build the He is a member of multiple concrete-focused organizations, of the solution for developing the industry's sustainability Energy Consumption company’s knowledge base in sustainable construction including the American Concrete Institute (ACI), standards,” said Antommattei about the importance of his CSA Group, ASTM International and Transportation and Kiewit’s engagement in industry initiatives. 4. Social Research Board. Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 4646

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Social Development Community Engagement Health & Safety / Appendix Diversity, Equity & Inclusion / Talent & Workforce Development / Community Engagement / 4 47474747

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Health & Safety Message from Management Strategies ObjecObjectivtive:e: Ensur Ensure the health and sae the health and saffeetty oy of our emplof our employyeesees, those in, those invvolvolved wied withth our prour projecojecttss, our clien, our clientts and the publics and the public, wi, with a goal oth a goal of Nobody Gef Nobody Getts Hurt, ands Hurt, and ■ Drive a culture where we are personally 1. Overview mosmost importt importanantlytly, z, zerero fo faattalialitiesties.. accountable for our own, and collectively responsible for each other’s safety, and About Kiewit everyone is empowered with Stop Work Sustainability at Kiewit On every project, we’re committed to Nobody Gets components that help drive the success of our overall Hurt and most importantly, zero fatalities. We owe it to safety programs. Responsibility Our Projects ourselves, our Kiewit family, and to every family waiting ■ Eliminate significant injuries and fatalities Training is developed and delivered on jobsites and in through our Life-Saving Actions (LSA) 2. Governance at home, to always put safety first. No exceptions. o昀昀ices to ensure we remain sharp and focused. We’re program and the verification of safeguards Corporate Governance Our Nobody Gets Hurt mindset means everyone does using data-driven tools and reporting to continue in high-risk categories Supply Chain their part to eliminate every injury or incident, no matter to refine our understanding of safety risks and give ■ Empower craft to take care of craft, in how seemingly minor. As early as the design phase, employees the tools they need to keep people safe. partnership with management, through 3. Environmental we look for ways to make work safer to build. From day We engage our clients and subcontractors in our safety our Craft Voice in Safety (CVIS) program Environmental Stewardship one when we hire or transfer employees, we ensure program, ensuring the tone is set from the beginning. ■ Engage our workforce to identify Greenhouse Gases & consistent employee onboarding and messaging. Before We routinely evaluate our project-level and corporate- workplace hazards and e昀昀ectively manage Energy Consumption every operation, we review our plans for potential safety level safety processes to verify they’re being executed risk through our standard Operations concerns and address them before work can begin. and confirm that they work. As an organization, we’re Start Card hazard analysis tool 4. Social Our Life-Saving Actions (LSA), Operations Start Cards pushing ourselves to make not only Kiewit, but our ■ Provide resources and 24/7 access to Health & Safety (Start Card) and Craft Voice In Safety (CVIS) are key entire industry, safer. mental health services for employees, Diversity, Equity & Inclusion their families and others who work on Kiewit projects through our Under the Talent & Workforce Hat focus Development Community Engagement Appendix 48484848

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT 2023 Progress 2023 Metrics ■ We made significant enhancements to our Life- human error with changes and upgrades to Message from Management Saving Actions (LSA) Program and Start Card. equipment, tools and personal protective equipment Read more on Pg. 51. (PPE). In our equipment fleet, this includes adoption 1. Overview ■ We continued to identify and demonstrate of new features like visual seat belt reminders and 0.00.055 opportunities to use data and safety analytics to more enhanced rear and surround cameras and Lost Time Incident Rate About Kiewit improve our safety program. Read more on Pg. 52. object detection on equipment. Sustainability at Kiewit ■ We made significant enhancements to our Under Our Projects ■ We continued to improve our ability to track safety training completed by our crews through the Hat program focused on mental well-being. development of an in-house tool called KrewTrac. Read more on Pg. 55. 00.25.25 2. Governance Read more on Pg. 53. ■ We continued to engage with many industry safety Total Recordable Incident Rate Corporate Governance ■ We made updates to our safety project startup initiatives, organizations and associations, including: Supply Chain processes which help ensure projects are prepared • Construction Safety Research Alliance (CSRA) with all of the essential safety measures in place • National Construction Safety Executives 3. Environmental before a project begins. We published a new job • Construction Industry Safety Initiative (CISI) 2323 Environmental Stewardship start-up checklist and standard operating Project Goose Eggs procedures (SOP) and provided best practice • Canadian Construction Safety Council *Projects that worked 200,000 hours or Greenhouse Gases & examples from previous projects. • Construction Safety Week more recordable free Energy Consumption ■ We continued to partner with key suppliers to 4. Social discuss ways we can work together to eliminate Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 49494949

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories Message from Management Front-Line Supervisor (FLS) leadership development standards 1. Overview provide development support and About Kiewit tools for success Sustainability at Kiewit In late 2022, we deployed new standards for our front-line Our Projects supervisor safety leadership training and development. A front-line supervisor is anyone supervising work at the 2. Governance field level. This includes, but is not limited to, foremen, leadmen, superintendents and field engineers. Standardized Format for the Weekly Corporate Governance Foremen’s Meeting Supply Chain The standardized development plan includes guidelines The foremen’s meeting is the method for ensuring for four fundamentals of FLS leadership. foremen are provided the same training, information 3. Environmental and guidance to create clear expectations. These FLS Onboarding guidelines ensure all teams understand who must attend Environmental Stewardship These guidelines provide the expectations for FLS Greenhouse Gases & these meetings and what topics they should cover. onboarding, including who must complete it, when they Energy Consumption must complete it, and what the onboarding must cover. FLS Best Practice Library The guidelines include templated resources for all Employees can access additional resources and best 4. Social projects to use. practices to complement the standards document. Health & Safety FLS Leadership Development The standardized materials help provide FLS and Diversity, Equity & Inclusion These guidelines provide monthly leadership their project and construction managers with clear Talent & Workforce development topics and facilitation guidelines. These expectations about the roles and responsibilities of a Development discussions are held once a month during foremen’s front-line supervisor. Community Engagement meetings and are facilitated by the FLS. It’s an opportunity for the FLS to develop their leadership Appendix presence and to encourage active discussions about things like character, communication, trust and teamwork, among other leadership topics. 50505050

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Life-Saving Actions (LSA) program ■ A safeguard is an item or action that prevents or ■ We revised our Start Cards to reflect the safeguard and Start Cards continue to evolve eliminates the potential of a severe outcome from a enhancements. Additional versions of the start card 1. Overview based on data and feedback life-changing category. were created for specific types of work with unique ■ A life-changing event is an event that occurred where safety risks. As an example, there are now Start Cards About Kiewit Many enhancements were made to our Life-Saving Actions the actual or potential result would have resulted in a specific to marine, foundations and maintenance work. Sustainability at Kiewit (LSA) Program and Operations Start Card (Start Card) in loss of life or a life-altering injury or illness. ■ We updated the LSA assessment app to make it Our Projects 2023 based on in-depth data and research and feedback even easier for our teams in the field to complete an from craft and front-line supervisors in the field. Both the ■ The Start Card ensures that crews verify all safeguards are in place prior to starting an operation. LSA assessment. Updated reporting from the LSA 2. Governance LSA Program and Start Card are key components of our assessment app will provide more actional data safety program and ultimate goal of Nobody Gets Hurt. ■ An LSA assessment is an operation-based regarding our safeguard trends to better address our Corporate Governance assessment done to verify safeguards are in place Supply Chain These are some terms that are important to know to most at-risk items. understand the enhancements and improvements we’ve before work begins. ■ We published a new guide, called Pete’s Safety Guide, 3. Environmental made to the LSA program and Start Cards. Updates and enhancements we made to our LSA and that makes it easier for people in the field to access ■ Life-changing categories are severe exposures or Start Card processes in 2023 included: the many components of our safety program directly Environmental Stewardship from a phone or iPad. Our goal is to make it as easy Greenhouse Gases & activities with common contributing factors that ■ We enhanced many of our safeguards based on as possible for crews to access information and follow Energy Consumption have a high likelihood of causing incidents with in-depth research into the company’s analysis of best practices. serious outcomes. safety data and trends. The enhancements help 4. Social ensure our people understand how to properly Health & Safety implement and verify the safeguards are in place Diversity, Equity & Inclusion before beginning work. Talent & Workforce Development Community Engagement Appendix 51515151

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Leveraging data to keep people safe 1. Overview In our e昀昀ort to be a data-driven organization, Kiewit’s data, safety and operations professionals continue to partner to About Kiewit develop and refine data solutions and reports to support Sustainability at Kiewit our safety program. These solutions help provide our Our Projects teams with invaluable information at di昀昀erent stages of a project to bring light to trends and opportunities to train 2. Governance our people so that Nobody Gets Hurt. A new data responsibility matrix - with header shown here - tells employees which safety reports they are responsible for reviewing One example is the safety risk forecast (SRF) model. and how frequently. Corporate Governance Supply Chain Developed and initially released to the business in 2021, We also use data from our LSA program, drawing from everyone know which reports they are expected to the data continued to help project’s drive data-driven 60 million hours of data to prevent job site incidents. It review on a daily, weekly or monthly basis, or in the 3. Environmental safety decisions in 2023. The tool works by using data to works by using data to identify the riskiest categories of pre-planning phases of a project, based on their roles predict incidents that could happen in the near future. work, then gives context for what project teams can look and responsibilities. The matrix includes quick links to Environmental Stewardship The program takes several factors into consideration, out for to stay safe. It’s being used to help project teams access the reports and definitions of each report and Greenhouse Gases & including timing of future work, ratio of less experienced understand how many LSA assessments should be done. how to use it. Energy Consumption sta昀昀, risky work hours and more. The SRF gives project teams with the lowest safety ratings an opportunity to In 2023, we developed a data responsibility matrix for 4. Social fix the most critical risk factors. project and management roles. This resource helps Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 52525252

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management New tool drives consistency in craft training and competency tracking 1. Overview Tracking craft training and verifying competency is an About Kiewit important part of ensuring our people are prepared to do Sustainability at Kiewit their jobs safely and e昀昀ectively. Our Projects In 2023, we further developed our KrewTrac tool, a simple and consistent approach to tracking and administering 2. Governance safety training on our projects. KrewTrac enables consistent Corporate Governance verification of training and competency as employees move Supply Chain from project to project. This helps ensure craft are trained and competent to the highest standard and eliminates 3. Environmental unnecessary retraining or recertification in cases where it’s not required. Environmental Stewardship Greenhouse Gases & We’ve prioritized making access and data input easy – Energy Consumption the tool is available via desktop and mobile app. The tool and its reporting – which includes applicable forms, tests 4. Social and documentation – provide one version of the truth for important personnel information. Health & Safety Diversity, Equity & Inclusion Many of our operating groups and large megaprojects Talent & Workforce trained on the new tool and rolled it out to their operations Development in 2023. The continuous feedback from these teams is Community Engagement driving continuous improvement of the tool. We anticipate full implementation in 2024. Appendix 53535353

20220233 "CVIS has benefited our safety culture by giving the SSUUSTSTAAINAINABBILITILITY REY REPPORORTT people who actually do the work in the field a voice to speak up on the issues that they encounter in our ever- Recommitting to safety as an changing construction industry. The program allows industry during Construction us to communicate with each other on safety concerns Safety Week Message from Management with people who we work hand-in-hand with everyday. We once again joined our industry peers to 1. Overview CVIS is not just going to morning, evening and celebrate Construction Safety Week in May. afternoon meetings talking about being our brothers' Construction Safety Week is an opportunity for About Kiewit and sisters' keepers, but actually being out in the field people, companies, and our entire industry to Sustainability at Kiewit doing just that!" join together, celebrate and recommit to doing Our Projects whatever it takes to send everyone home safely FFrrank ank Guillory JrGuillory Jr., C., CVIS MemberVIS Member every day. 2. Governance During Safety Week, Kiewit employees across Corporate Governance Featured Stories North America took part in discussions on Supply Chain CONTINUEDCONTINUED daily topics assigned by the Construction Safety Week executive committee, with some 3. Environmental Craft Voice in Safety (CVIS) customized additions from our Corporate Safety program continues to connect craft KKVISVIS department. We kicked things o昀昀 with a video Environmental Stewardship message from one of our corporate safety Greenhouse Gases & and management to drive safety directors which was shared with all project Energy Consumption engagement teams. There were conversations about our Craft Voice in Safety (CVIS) is an integral part of Kiewit’s Life-Saving Actions program and Start Cards, 4. Social trainings and a thank you day to show gratitude safety program. CVIS is designed to empower craft to take Health & Safety ownership of their personal safety and the safety of those to our people. Project and o昀昀ice personnel Diversity, Equity & Inclusion working on the project. This is accomplished through the planned their own demonstrations and Talent & Workforce creation of a craft-led committee comprised of on-site craft conversations relevant to their workforce. Development workers. That group serves as the direct link between the Community Engagement craft and management regarding the culture, health and safety of all employees. Appendix Our monthly CVIS roundtable calls connect CVIS leaders Some of our project teams have started a Kids from across the company allowing collaboration across Voice in Safety (KVIS) program. KVIS is an teams while sharing and discussing best practices and opportunity to introduce safety topics to our lessons learned. In 2023, more than 600 CVIS leads from families through fun coloring pages and activities. across the company were invited to join these monthly calls. 54545454

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Continued enhancements to Under The changes included: the Hat: Building Healthy Minds ■ New EAP partnership in the U.S. with Lyra. 1. Overview program help employees and their families prioritize mental health ■ Enhanced Employee and Family Assistance About Kiewit Programs (EFAP/EAP) and provider services in Sustainability at Kiewit An employee’s emotional well-being a昀昀ects how they Canada and Mexico. Our Projects show up in the workplace, at home and everywhere life ■ A new-and-improved website that serves as a one- takes them. stop-shop to a variety of tools including employee 2. Governance Kiewit’s “Under the Hat (UTH): Building Healthy stories, printable materials and EAP information . Corporate Governance Minds” focus provides resources and opens the lines of ■ The enhanced services o昀昀er an array of benefits for Supply Chain communication to having everyday conversations around employees, their families and household members, mental health for employees, their families and others including an on-demand self-care library, free mental 3. Environmental who work on Kiewit projects. health coaching, therapy sessions and much more. Environmental Stewardship In 2023, Kiewit upgraded most of its Employee Assistance UTH launched at the end of 2021 and serves as a way for Greenhouse Gases & Programs (EAP) and services, improving the tools and the company to escalate its focus on educating employees Energy Consumption resources for employees as a part of its mental health on increasing mental health understanding, identifying advocacy e昀昀orts. The changes made in 2023 represent warning signs, and promoting the use of available 4. Social a significant investment and upgrade compared to what resources to support mental health. Health & Safety was previously available to employees and their families. The goal is to make mental wellness part of daily Diversity, Equity & Inclusion conversation amongst employees, encouraging them to Talent & Workforce share experiences and reach out for help when needed. Development Community Engagement Since the UTH launch, the data reveals more employees and their families are proactively seeking mental health Appendix support by utilizing EAP resources. Moving forward, the Under the Hat focus areas include continuing to gather best practices, resources and training for wellness and mental health. 55555555

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Diversity, Equity & Inclusion Strategies Message from Management ObjecObjectivtive:e: Build a cult Build a culturure oe of divf diverersisittyy, equi, equitty & inclusion thay & inclusion that benet benefifitts ours our emploemployyeesees, oper, operaationstions, supplier, suppliers and partners and partnerss, and communi, and communitiesties.. ■ Recruit, develop and retain a diverse 1. Overview workforce It takes a variety of experiences, backgrounds and perspectives to deliver the best solutions to our clients and ■ Foster an inclusive culture, where About Kiewit communities. Kiewit’s Core Values — People, Integrity, Excellence and Stewardship — are the driving force all backgrounds, experiences and Sustainability at Kiewit behind our ongoing, proactive commitment to building a diverse, equitable and inclusive company. Kiewit perspectives are valued and respected Our Projects strives to build an environment where all are included, have a voice, and can reach their full potential to make ■ Provide equitable compensation and 2. Governance our company the best contracting organization on earth. career development opportunities Our diversity, equity & inclusion program is centered on four pillars and objectives. ■ Provide benefits that support all types Corporate Governance of families Supply Chain ■ Provide meaningful economic 3. Environmental opportunities for underrepresented, Employees Operations underserved and diverse suppliers Environmental Stewardship ■ Support community building, workforce Greenhouse Gases & readiness and education e昀昀orts committed Energy Consumption Recruit, develop and retain a diverse workforce, Staff projects to reflect the communities in to diversity, equity & inclusion and foster a culture of inclusion where all can which we work, enabling our project teams 4. Social bring their authentic selves to work and all to better represent, understand and address ■ Measure our performance to enable backgrounds, experiences and perspectives are the unique needs of each community. improvement Health & Safety valued and respected. Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Suppliers & Partners Community Appendix Volunteering & Giving Provide more equitable economic opportunities Invest in and support programs committed by actively engaging and supporting to diversity, inclusivity and equity in the disadvantaged, underrepresented and diverse communities where we live and work. suppliers, vendors and subcontractors across our supply chain. 56565656

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT 2023 Metrics 1,2,1,2,33,,44 1,2,1,2,4,4,77 1,2,1,2,88,,99 GENDER DIVERSITGENDER DIVERSITYY RARACIALCIAL AND ETHNIC DIVERSITAND ETHNIC DIVERSITYY MILITMILITARARYY SER SERVICE MEMBER/VETERAN VICE MEMBER/VETERAN Message from Management Percentage of female employees in U.S. and Canada Percentage of racially and ethnically diverse employees in U.S. Percentage of military service members and veterans in U.S. 1. Overview Kiewit 2021 Industry Kiewit 2021 Industry Kiewit Comparison Comparison About Kiewit Sustainability at Kiewit 114%4% 12%12% 444%4% 38%38% 4.4.8%8% Our Projects All employees All employees All employees All employees All employees9 2. Governance Corporate Governance 23%23% 28%28% 2727%% 2424%% FOOTNOTES Supply Chain 1. All Kiewit data based on average headcount in 2023 Staff employees Staff employees5 Staff employees Staff employees5 2. Based on voluntary self-identification or other permissible records 3. Environmental 3. Percentages remain consistent when separated by country 4. Industry Comparison: U.S. Based on 2021 EEO-1 Job Patterns for Environmental Stewardship Minority and Women in Private Industry Reports Published by 6%6% 3%3% 61%61% 46%46% the Equal Employment Opportunity Commissions (EEOC) for Greenhouse Gases & Construction Industry Energy Consumption Craft employees Craft employees6 Craft employees Craft employees6 5. Industry Comparison Estimated Sta昀昀 (All Job Categories except Craft Workers, Operatives, Laborers and Sales Workers) 6. Industry Comparison Estimated Craft (Craft Workers, 4. Social Operatives and Laborers Job Categories) 7. Ethnicity and race is not tracked in Canada Health & Safety 8. Utilize OFCCP veteran benchmark for hiring which is intended Diversity, Equity & Inclusion to produce a representative veteran workforce; in 2023, the OFCCP veteran hiring goal was 5.4% Talent & Workforce 9. Military or veteran status is not tracked in Canada Development Community Engagement Appendix 57575757

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT 2023 Progress Building a DivBuilding a Divererse se TTalenalent Pipelinet Pipeline • Supported and attended the Society of Hispanic • Coordinated outreach to connect with incarcerated Message from Management Professional Engineers (SHPE) National Convention people reentering the workforce, including ■ We held our second Thurgood Marshall College Fund and supported collegiate SHPE chapters on two developing a relationship with Texas Department Immersion Program in March. Read more about the college campuses. of Corrections. 1. Overview program on Pg. 63. • Attended the National Society of Black Engineers ■ Our sta昀昀 and craft recruiting teams partnered to About Kiewit ■ We held our annual Future Women in Kiewit Summit in (NSBE) 49th Annual Convention in Kansas City and Sustainability at Kiewit November. Read more about the program on Pg. 61. coordinate several outreach events and partnerships supported chapters on three college campuses. to connect with military service members and Our Projects ■ We awarded six Women in Kiewit and six Legacy veterans, including: Diversity scholarships to Kiewit dependents pursuing ■ Our craft recruiting team led key outreach events 2. Governance focused on diversifying our talent pipeline, including: • Formalized a partnership with Army Pays for construction and engineering careers – the most Your Success (Army PaYS). Read more on Pg. 69. we’ve ever awarded in a year. Read more about the • Attended multiple career fairs sponsored by Corporate Governance Indigenous Communities in Canada • Attended 13 Hiring Our Heroes Career Summits. Supply Chain scholarship program on Pg. 65. ■ Our sta昀昀 recruiting team coordinated several outreach • Sponsored Skills Alberta and Skills B.C. and • Attended two Recruit Military events. 3. Environmental events intended to diversify our talent pipeline, attended competition events and conferences, • Attended three Service Academy Career including: including the Girls Exploring Trades and Technology Conferences. Environmental Stewardship • Attended five events on Historically Black College Conference hosted by Skills Alberta Greenhouse Gases & • Conducted outreach activities with National & University (HBCU) campuses • Continued e昀昀orts as an Employer of Choice with Guard and Reserve Units in Utah, Louisiana, Energy Consumption the Canadian organization Women Building Futures, • Coordinated an executive sponsored visit to Florida and Texas. Florida State/Florida A&M University to strengthen including interviewing four classes of students, 4. Social which resulted in hiring and indenturing three ■ Our o昀昀ice in Lone Tree, Colorado, continued its our relationships. carpenter apprentices neurodiversity hiring pilot program. Read more on Health & Safety • Attended the Society of Women Engineers (SWE) Diversity, Equity & Inclusion • Attended EXPO Contratista in Houston, Texas. Pg. 66. National Convention and supported collegiate SWE Talent & Workforce chapters on seven college campuses. • Visited three Job Corps Centers. Development Community Engagement Appendix 58585858

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview 2023 Progress About Kiewit CONTINUEDCONTINUED Sustainability at Kiewit FFososttering an inclusivering an inclusive culte cultururee environment. The training was assigned to all sta昀昀 PrProoviding beneviding benefifitts thas that support allt support all Our Projects employees and added to our sta昀昀 onboarding plan. ttypes oypes of ff familiesamilies ■ We coordinated two all-company calls hosted by our ■ We celebrated Women in Construction Week. See Pg. 2. Governance Women in Kiewit and Diversity, Equity & Inclusion 68 for some examples of how employees engaged. ■ We partnered with a third-party vendor to begin Corporate Governance corporate committees. These webinars included o昀昀ering breast milk shipping services for traveling updates about our diversity, equity and inclusion ■ We participated and engaged in conversation during breastfeeding parents. This service allows parents Supply Chain journey, featuring perspectives from many employees Construction Inclusion Week. Our executive DEI who are breastfeeding and traveling for work with the and interns from across the company. sponsor shared a toolbox talk and resource toolkit supplies they need to store and transport milk at no 3. Environmental companywide that expanded upon our Mutual Respect cost to the employee. ■ We updated our intranet to provide better access to training takeaways. This was an important opportunity Environmental Stewardship frequently requested materials related to our diversity, Greenhouse Gases & equity and inclusion programs. This includes providing for our sta昀昀 and craft to engage in important PrProoviding equividing equittable compensaable compensation andtion and Energy Consumption a new guidebook to help local Women in Kiewit conversations for the industry. chapters organize their e昀昀orts based on best practices ■ We improved our voluntary self-identification process carcareer deeer devvelopmenelopment opportt opportuniunitiesties 4. Social collected from existing groups. for U.S. employees. This included changing the ■ Our compensation program includes a regularly Health & Safety ■ We launched an all-sta昀昀 Mutual Respect training. identification options to be more inclusive of di昀昀erent conducted, third-party pay equity review of our The training is intended to raise awareness and groups of military service members and veterans. sta昀昀 employees. The review ensures that employee Diversity, Equity & Inclusion We continue to remind employees about the benefits compensation is commensurate with role, experience, Talent & Workforce understanding of the importance and benefits of completing the voluntary self-ID form so we can Development of diversity, inclusion and mutual respect in the line of business, time in role, performance, and location, workplace. It also includes video messages from the better track our workforce demographics and diversity, among other job-related factors, regardless of any Community Engagement equity and inclusion progress. employee’s race or gender. Our most recent review executive sponsor of our DEI and Women in Kiewit committees and members of our DEI committee, as ■ Many employee groups on projects or in o昀昀ices revealed that, overall, women are paid $1 for every $1 Appendix coordinated their own employee engagement and earned by men in the U.S. and Canada. In the U.S., well as additional course material. It included real scenarios from our industry to make it as relatable as networking opportunities focused on diversity, equity people of color are paid $1 for every $1 earned by white possible and highlights actions people can take to be and inclusion topics. employees, with the exception of one sub-group that personally accountable to building an inclusive work was paid 99¢ for every $1 earned by white employees. Any pay disparities identified in the most recent review have been resolved. 59595959

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT 2023 Progress CONTINUEDCONTINUED Message from Management Supporting communiSupporting communitty causesy causes Building sBuilding strtrong partnerong partnerships wiships withth WWorking alongside ororking alongside organizganizaations andtions and championing divchampioning diverersisittyy, equi, equitty &y & Indigenous PIndigenous Peopleseoples associaassociationstions 1. Overview inclusioninclusion ■ Our Canadian employees observed National Day for ■ Forming strong partnerships with organizations and About Kiewit ■ Please see the Community Engagement section Truth & Reconciliation. Read more on Pg. 68. associations is a key component of our diversity, equity Sustainability at Kiewit on Pg. 79 for examples of charitable giving and ■ All Canadian sta昀昀 employees received Indigenous and inclusion program. Some of the organizations we Our Projects volunteering in our communities. Peoples awareness training. are members of, partner with or support include: ■ We improved the processes for tracking spend with • Society of Women Engineers (SWE) 2. Governance PrProoviding economic deviding economic devvelopmenelopmentt Indigenous businesses. • National Society of Black Engineers (NSBE) Corporate Governance opportopportuniunitiesties ■ Projects in Canada tracked the number of Indigenous • Society of Hispanic Professional Engineers (SHPE) Supply Chain ■ Please refer to the Supply Chain section on Peoples hires. • Thurgood Marshall College Fund (TMCF) Pg. 23 for an overview of our e昀昀orts to engage ■ We continued to prioritize building strong partnerships • Department of Defense SkillBridge 3. Environmental diverse suppliers. with Indigenous communities. Read about examples staring on Pg. 28. • Hiring our Heroes Environmental Stewardship • Army Partnership for Your Success (Army PaYS) Greenhouse Gases & Energy Consumption • See additional diverse supplier focused organizations in the Supply Chain section on Pg. 23. 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 60606060

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories Message from Management The Future Women in Kiewit Summit continues to evolve 1. Overview In November, 105 collegiate women attended our annual Future Women in Kiewit Summit at Kiewit University in About Kiewit Omaha, Nebraska. The attendees included Kiewit interns Sustainability at Kiewit and other collegiate students studying construction and Our Projects engineering at 61 universities across the U.S. and Canada. 2. Governance Prior to starting our registration process for the 2023 event, we reassessed our candidate outreach e昀昀orts for Corporate Governance areas of opportunity. We leveraged digital marketing to Supply Chain spread the message. Our intent was to broaden our reach beyond our existing intern population and the schools we 3. Environmental recruit at in person. Environmental Stewardship The event featured several di昀昀erent presentation formats Greenhouse Gases & to provide di昀昀erent takeaways and engagement Energy Consumption opportunities for attendees. During the event, Kiewit employees shared presentations and facilitated 4. Social discussions. Some of the topics have become standard Health & Safety at the event over the past decade, including: Diversity, Equity & Inclusion ■ An opening conversation with Executive Vice Talent & Workforce 2023 Metrics President Doug Glaser Development ■ Vice President of Quality Dee Oswald’s talk Community Engagement 6161 6464 on confidence Appendix 105105 ■ Two Q&A panels with Kiewit employees – one participants universities / colleges job offers with early-career employees and one with more represented accepted tenured employees 'The Future Women in Kiewit Summit continues to evolve' continued on next page 61616161

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Featured Stories CONTINUEDCONTINUED Our Projects Many new things were added to the agenda to provide Here is what some of the attendees had to say about 2. Governance attendees with even more valuable takeaways, insight into the event: Corporate Governance Kiewit culture and opportunities to connect with each other. Supply Chain “At school, there are girls in my classes but not as many ■ A presentation on Kiewit’s Under the Hat program as I would like. It’s really nice to be around women emphasizing the importance of mental health who have the same career goals as me. We get to have 3. Environmental ■ Co昀昀ee chat conversations between participants, interesting conversations.” Environmental Stewardship facilitated by employees, about topics like mental Greenhouse Gases & health, sustainability and allyship “To see this women-led panel of field engineers, Energy Consumption construction workers, HR managers, vice presidents, ■ A presentation on financial planning and the economic I’m like ‘Okay, now I see it, I can achieve that’ because power of women it’s just a visual representation of what’s out there for 4. Social ■ A career fair me to achieve.” Health & Safety ■ A stewardship activity – attendees wrote cards of Diversity, Equity & Inclusion “I feel like I have gotten something out of every activity, encouragement that Girl Scouts Spirit of Nebraska every panel. Just new information and good advice from Talent & Workforce shared with their troops and troop leaders and packed all these amazing women.” Development period products into hygiene kits that Access Period Community Engagement and Project Harmony distributed “It’s a great way to network. Meeting so many other ■ A visit to the Kiewit Luminarium, a dynamic, innovative girls and hearing their own stories and what they’re Appendix museum where people of all ages and backgrounds interested in and their experiences – especially being can explore and learn more about science, technology, on the design side of engineering – it’s really interesting engineering and mathematics through interactive displays to learn about other people’s experience and field and engaging exhibits. Kiewit served as the driving force work. I just loved hearing about what other people are behind the Luminarium’s development in Omaha. passionate about.” 62626262

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & Featured Stories Energy Consumption CONTINUEDCONTINUED 4. Social Kiewit and TMCF’s partnership started in 2022. In Thurgood Marshall College Fund Health & Safety Immersion Program expands in February 2022, 20 students attended the first immersion Diversity, Equity & Inclusion second year event at Kiewit. Eight students went on to intern with Talent & Workforce and received scholarship support from the company. Development Thirty Historically Black College & University (HBCU) Preparation for the 2023 student cohort started in 2022 Community Engagement students gathered at Kiewit’s regional o昀昀ice in Lone Tree, with the decision to increase the number of immersion Colorado on March 7-8 for the Thurgood Marshall College participants from 20 to 30 and internship and scholarship Appendix Fund and Kiewit Immersion Program. recipients from eight to 20. TMCF is the nation’s largest organization exclusively The goal of the Immersion Program event was to give representing the Black College Community. One way TMCF students the opportunity to get to know Kiewit and supports students is by partnering with organizations to Kiewit to get to know the students, to ensure each is the 'Thurgood Marshall College Fund Immersion Program connect top talent with internship and job opportunities. right fit for the other. expands in second year' continued on next page 63636363

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT 2023 Metrics Message from Management 3030 1. Overview Immersion Program participants About Kiewit Sustainability at Kiewit Our Projects 1919 2. Governance summer interns and Corporate Governance scholarship recipients Supply Chain (+1 full-time hire) 3. Environmental Featured Stories “Over this three-day experience, I learned about the CONTINUEDCONTINUED di昀昀erent aspects of the Kiewit construction and engineering Environmental Stewardship departments. Along with learning about a day in the life of 1010 Greenhouse Gases & Students took a deep dive into Kiewit’s culture construction and engineering, I participated in character Energy Consumption and operations. They also participated in a Gallup development and confidence exercises, which really helped HBCUs represented StrengthsFinder workshop and engaged in conversations me see who I am and how I can develop my professional 4. Social about confidence, benefits, mental health, and current skills. Additionally, there were panel discussions and markets and projects. Participants heard from Kiewit presentations from the di昀昀erent engineers and constructors Annual commitment of Health & Safety leaders and employees during presentations, panel of Kiewit that provided an insight on their professional Diversity, Equity & Inclusion discussions and small group Q&A sessions. To cap o昀昀 journey. Apart from these presentations and discussions $$400400,,000+000+ Talent & Workforce the event, they toured a local transportation project. I got the chance to visit a construction site and really get Development For many, it was their first time on a construction site. a real life glance of their operative procedures for their through 2026 Community Engagement current project.” Following the Immersion Program, 19 students accepted Appendix internships with Kiewit and were also provided with “Recently, I had the opportunity to travel to Denver, scholarship support. One additional student started as Colorado for an immersion program hosted by Thurgood a full-time hire instead of an intern. Marshall College Fund! It was an amazing experience that Some of the participants shared their reflections. allowed me to learn more about my strengths as a young professional, as well as the company culture at Kiewit.” 64646464

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED 2023 Metrics Message from Management A growing impact through the Women in Kiewit and Legacy 1. Overview Diversity Scholarships 1212 1010 44 About Kiewit The Women in Kiewit and Legacy Diversity scholarships new scholarship recipients who graduates working provide dependents of Kiewit employees with tuition recipients selected have graduated through full-time with Kiewit Sustainability at Kiewit in 2023 lifetime of program at year-end 2023 Our Projects assistance of $5,000 per semester, per year for up to four years. Eligible candidates are graduating high school 2. Governance seniors and current college students who are dependents 2023 D2023 DAATTAA LIFETIME DLIFETIME DAATTAA of current Kiewit employees – sta昀昀 or craft – and pursuing Corporate Governance an engineering or construction management degree. 3232 4444 Supply Chain In 2023, we awarded six Women in Kiewit Scholarships total scholarship recipients lifetime 3. Environmental and six Legacy Diversity Scholarships. This is the greatest funded in 2023 total recipients number of scholarships awarded since starting the Environmental Stewardship scholarship programs. Greenhouse Gases & For the first time, a scholarship was awarded to a $$1,1,005005,,000000 Energy Consumption $300$300,,000000 Canadian student. total invested in 2023 lifetime total invested 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 65656565

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Neurodiversity hiring pilot program continues to gain momentum 1. Overview Our Infrastructure Engineering team based in Lone Tree, About Kiewit Colorado, is piloting a neurodiversity hiring program. Sustainability at Kiewit According to the National Institutes of Health, the term Our Projects neurodiversity, “describes the idea that people experience and interact with the world around them in many ways, 2. Governance with no one ‘right’ way of thinking, learning, and behaving, Corporate Governance and di昀昀erences are not deficits. Neurodiversity refers to Supply Chain the diversity of all people, but it is often used in the context of autism spectrum disorder and other neurological or 3. Environmental developmental disorders such as ADHD or dyslexia." Environmental Stewardship The program started with a lot of research and engagement Greenhouse Gases & with other companies and organizations coordinating and Energy Consumption advocating for neurodiversity hiring programs. The team engaged with an external consultant – Neurodiversity in the 4. Social Workplace (NITW) – to help guide their next steps. employees leading the pilot program acknowledge that its Large Employer Award for the neurodiversity pilot there have been a lot of learning moments. Notably, program, following nomination by one of the consultants Health & Safety First, they identified roles that would be a good fit for the realization that some employees in Kiewit's existing our team engaged. Diversity, Equity & Inclusion a wide range of neurodiverse candidates. This set the workforce may identify as neurodiverse. As a result, an Talent & Workforce stage for their first skills-based hiring event in December emphasis of some of their internal conversations has been The employees who oversee the program are humbled Development 2022. Skills-based hiring allows candidates to directly on education about Kiewit’s accommodation process. by ASPE’s recognition, but acknowledge the e昀昀ort is just Community Engagement demonstrate their competencies. The format addresses a This has also been emphasized at the corporate level getting started. They suspect the recognition may be common barrier for many neurodiverse candidates seeking on all-company DEI calls and intranet articles highlighting partially because neurodiversity hiring programs are not Appendix employment. Four people were hired after the December the program. common in construction and engineering. 2022 skills-based hiring event. NITW helps the team support newly hired employees and their managers. Another hiring event was held in September 2023. They have been intentional about managing the program responsibly and establishing a foundation that can be built Importantly, NITW also conducts lunch-and-learn training The Colorado Association for People Supporting upon to potentially expand the program beyond their group open to all the department’s employees. The Kiewit Employment First (APSE) recently recognized KIE with in the future. 66666666

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories Building connections through CONTINUEDCONTINUED industry engagement Message from Management Kiewit joins ICAN to mark 30 years Employees attended the national conventions for of the Women’s Leadership Summit National Society of Black Engineers (NSBE), Society 1. Overview of Women Engineers (SWE) and Society of Hispanic In Omaha, Nebraska, more than 100 employees attended Professional Engineers (SHPE) to build connections About Kiewit the ICAN’s 30th annual Women’s Leadership Summit. The with industry professionals and share information about Sustainability at Kiewit theme and agenda focused on leading bold conversations, career opportunities with Kiewit. We also provided Our Projects and how those conversations can lead to career, personal financial sponsorship for these events. and leadership growth. Kiewit Vice President of Environmental Program Jennifer 2. Governance Bradtmueller and ICAN President and CEO Aileen Kiewit is a sponsor of the event and the ICAN Leadership Warren present the ICAN Leadership Award to Racquel Corporate Governance Award, which is presented each year to a person at Henderson, a pathway coordinator with Metropolitan Supply Chain any leadership level who demonstrates collaboration, Community College. compassion, confidence and creativity. The annual award, 3. Environmental “recognizes people who live and lead authentically.” Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 67676767

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories Celebrating Women in Construction CONTINUEDCONTINUED Week Message from Management During Women in Construction Week in March, we featured employee perspectives on our internal and external platforms. 1. Overview In these short videos, employees described their current roles and responsibilities, why they like working in construction and About Kiewit engineering, and their advice for women joining the industry. Sustainability at Kiewit Employees on our projects and in our o昀昀ices also organized Our Projects their own Women in Construction Week activities, like networking events, guest speakers and teambuilding outings. 2. Governance Corporate Governance In Lenexa, Kansas, our local team donated a STEM/construction themed booked to every 3 and 4-year-old student and every Supply Chain 3 and 4-year-old classroom at Operation Breakthrough. Operation Breakthrough provides a safe, loving and educational 3. Environmental environment for children in poverty and empowers their families Environmental Stewardship Canadian teams observe National through advocacy, emergency aid and education. Employees Greenhouse Gases & Day for Truth and Reconciliation read to students at Operation Breakthrough. Energy Consumption Across Canada, our colleagues observed National Day 4. Social for Truth and Reconciliation. Senior leaders sent Health & Safety memos to employees, sharing educational resources Diversity, Equity & Inclusion and encouraging them to reflect on the legacy of the residential school system. Talent & Workforce Development Here are some of the ways we observed: Community Engagement ■ Donated to The Cîmitowak project Appendix ■ Worked with local Indigenous artists for orange shirt and hard hat decal designs ■ Facilitated toolbox talks about the history of the day ■ Held ceremonies with local First Nation communities on some project sites 68686868

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Featured Stories CONTINUEDCONTINUED Environmental Stewardship Greenhouse Gases & Kiewit formalizes new partnership with Army Partnership for Your Success (Army PaYS) Energy Consumption Soldiers are now guaranteed an interview for employment At the event, Colonel Medcalf reflected on the similarities Kiewit Vice President of Human Resources Darron Rolle 4. Social at Kiewit following their Army service, thanks to the Army between Kiewit and the military that ensure a strong also spoke at the event. After thanking Kiewit’s existing Partnership for Your Success (Army PaYS) program. The relationship between the two organizations. “Kiewit and workforce of active and retired military for their service, Health & Safety program is a strategic partnership between the U.S. Army the military are cut from the same cloth,” he said. he also reflected on similarities between Kiewit and Diversity, Equity & Inclusion and a cross-section of corporations, companies and public the U.S. Army, including an emphasis on integrity and Talent & Workforce sector agencies. Adjutant General Strong shared similar thoughts with personal development. He also remarked that Kiewit Development those gathered, reflecting on Kiewit’s long history of and the U.S. military share an ambition to make their Community Engagement Kiewit Infrastructure Engineers Design Area Manager and supporting the U.S. military through its construction organization’s better through continued diversity, equity Nebraska Army National Guard Colonel Brian Medcalf and projects, dating back to World War II when Kiewit was and inclusion e昀昀orts. Appendix Nebraska National Guard Adjutant General Craig Strong integral to the war e昀昀ort. He discussed the importance signed a ceremonial memorandum of understanding of the relationships between employers and the military, Army PaYS has more than 1,100 partner organizations, (MOU) between Kiewit and Army PaYS at an event at complimenting the talent of Kiewit’s workforce and the but few in the construction and engineering space. The Kiewit University in August 2023. The MOU formalizes the opportunities the company provides to service members program will provide Kiewit with access to its database start of a new partnership aimed at bringing more military seeking careers in the private sector. of candidates, facilitate face-to-face interviews and post Veterans into Kiewit’s workforce. job openings to its social media platforms. 69696969

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Talent & Workforce Strategies Message from Management Development ■ Deliver internal training to sta昀昀 and craft employees 1. Overview ObjecObjectivtive:e: Pr Proovide indusvide industrytry-leading tr-leading training and deaining and devvelopmenelopment opportt opportuniunities fties foror ■ Support employees pursuing external training, About Kiewit our people and coorour people and coordinadinatte we workorkffororce dece devvelopmenelopment outrt outreach teach to pro promoomotte care careereer development and education opportunities Sustainability at Kiewit opportopportuniunities in the consties in the constructruction industion industrytry.. ■ Drive continuous, in-the-moment feedback Our Projects We support long and prosperous careers that o昀昀er our Center facilities are hubs for our in-person, corporate and reviews through our Right-Time sta昀昀 and craft employees continuous opportunities to employee training programs. Feedback program 2. Governance learn something new, take on more responsibilities, ■ Provide a best-in-class internship program Our workforce development e昀昀orts are focused on Corporate Governance advance within the organization and write their own building connections with community organizations, ■ Partner with community organizations, Supply Chain legacies. Our talent development program includes industry associations and vocational schools. We industry associations and vocational schools on-the-job training, corporate schools, reimbursement partner together with these groups with a shared goal on workforce development e昀昀orts 3. Environmental for external education and certifications, and regular of recruiting more people into the construction trades Environmental Stewardship performance reviews. Our Kiewit University and Training and connect them with lifelong career opportunities. Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 70707070

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT 2023 Metrics Message from Management OOVERALLVERALL TRAINING TRAINING NANATIONALTIONAL CENTER F CENTER FOROR EMPLEMPLOOYEE DEVELYEE DEVELOPMENTOPMENT TUITIONTUITION INVEINVESSTMENTTMENT CONSCONSTRUCTRUCTION EDUCTION EDUCAATIONTION AND FEEDBAND FEEDBAACKCK REIMBURSEMENTREIMBURSEMENT AND REAND RESEARCH CERSEARCH CERTIFIEDTIFIED 1. Overview 1,1,323277,,881881 TRAININGTRAINING 100%100% About Kiewit $629$629,,600600 Sustainability at Kiewit annual hours of on-the-job, 342342 of qualifying* employees invested in tuition reimbursement district and corporate received an annual performance Our Projects training completed by full-time NCCER participants and wage review staff employees *Full-time staff employees, excludes executives and 2. Governance employees hired 6 months or less prior to review cycle Corporate Governance 171777 Supply Chain $7$7,8,84455 32,32,805805 63%63% people who used NCCER hours tuition reimbursement 3. Environmental average annual spend per full-time staff employees full-time staff employee on completed a Right-Time Environmental Stewardship training and development Feedback check-in for Greenhouse Gases & continuous development Energy Consumption feedback beyond the annual performance and wage 4. Social review cycle Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 71717171

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT 2023 Progress ■ We launched a new Field Engineer 101 training to help diversity, equity & inclusion; leadership presence; by an overall corporate e昀昀ort. The new corporate Message from Management new engineers successfully integrate into Kiewit. Read problem solving; and time management. It’s an easy- Workforce Development team works closely with our more on Pg. 73. to-use resource that employees can use to improve regional and local operations teams to identify the 1. Overview ■ We launched new mobile training facilities to bring their skills in a time and format that works for them. right organizations to partner with. The Workforce craft training to our projects. Read more on Pg. 74. Managers are encouraged to use the Development Development team is responsible for building and About Kiewit Resource Workbook to complement their Right-Time maintaining Kiewit’s strategic relationships with Sustainability at Kiewit ■ We launched a new Development Resource Workbook Feedback check-ins. community organizations and vocational schools, for employees. It’s a curated collection of development with continuous alignment with our operations Our Projects content across internal and external platforms. These ■ Our Chief Engineers Council hosted its seventh annual Engineering Technical Summit. Read more on Pg. 75. leaders. Read more about our Workforce Development resources – including podcasts, videos, articles, e昀昀orts on Pg. 78. 2. Governance online trainings and more – are segmented by topic ■ We formalized a Workforce Development team Corporate Governance and meant to help jump-start development e昀昀orts for within our Human Resources department. Prior to Supply Chain individuals or teams. Some of the 27 topics covered in this, workforce development e昀昀orts were driven the workbook include accountability; client relations; by regional or local teams, rather than supported 3. Environmental Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 72727272

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Featured Stories Greenhouse Gases & Energy Consumption Field Engineer 101 welcomes new hires with reimagined training program 4. Social Field Engineer 101 (FE 101) is a new Kiewit University As a result, FE 101 reimagines the Field Operations School, applications. With this portion of the school, the learner Health & Safety school that o昀昀ers a helping hand when it comes to meeting the learners where they are with virtual eLearning, picks from the discipline that makes the most sense Diversity, Equity & Inclusion successfully integrating new engineers into Kiewit. peer networking and collaborative learning at their project. for their career development, such as civil operations, Talent & Workforce The new course was first introduced as a pilot program FE 101 is automatically assigned to all field engineer 1 concrete, piping, electrical, mechanical and structural steel. Development in early 2023 before o昀昀icially becoming part of our Kiewit employees within their first three months of employment. Community Engagement University coursework. The new format also removes the limit on the number FE 101 consists of two parts. The first five-week part of attendees during the six sessions each year, allowing Appendix Prior to the launch, a new field engineer’s first experience is all about the fundamentals: Kiewit’s culture, safety, flexibility to accommodate all new hires. The school’s with our Kiewit University training was through a course construction documents, field communication, written structure not only better serves the needs of business, called Field Operations School that took place in person communication and time management. but also immediately puts the content into practice. at one of our training facilities. Although eligible after six months, the average attendee was 14 months into their The second part is more discipline-specific, with eLearning career due to nomination logistics and limited seats. courses, peer and manager discussions, and field 73737373

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Mobile training facilities take craft 1. Overview training on the road About Kiewit To help craft workers build long-lasting careers, no matter Sustainability at Kiewit where they are, we began replicating our training facility courses in fully loaded, mobile Conex box classrooms in Our Projects 2022, with increasing impact in 2023. 2. Governance Kiewit’s Talent Development team worked closely with Corporate Governance craft instructors to quickly and cost e昀昀ectively develop the Mobile Training Facilities (MTFs). The MTFs began as Supply Chain two empty 20-foot Conex boxes; one with workstations 3. Environmental for learners and one to store the tools, equipment and materials required to complete the training for a specified Environmental Stewardship craft discipline. The team assembles and stocks the Greenhouse Gases & facilities before shipping them to project sites. Energy Consumption There are five di昀昀erent configurations for pipefitting, 4. Social electrical, millwright, concrete and ironworking disciplines. The MTF for concrete includes supplies for the hands- On-site training provides a collaborative and comfortable Health & Safety on portion of training, such as building formwork for environment for craft. Instructors note seeing an increase in Diversity, Equity & Inclusion foundations and pouring a concrete slab. Similarly, the learners’ focus during their MTF courses. Talent & Workforce electrical facility is entirely self-contained with materials Development and tools included to run conduit, wire switches and more. These MTF trainings cover basic core construction topics The electrical MTF has separate workstations for each and the entry level coursework needed for a discipline, Community Engagement part of the National Center for Construction Education and learner simulating an electrical room. MTFs for pipefitting, Appendix millwright and ironworking each have toolboxes for Research’s (NCCER) level 1 and 2 standardized training learners filled with everything they need to perform their modules. Learners are required to pass both written respective trades. knowledge and hands-on performance tests to receive credit for the school and advance to the next level. 74747474

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Kiewit Engineering Technical Summit spotlights innovative ideas and fosters 1. Overview creative thinking and awards nearly 9,000 professional development hours About Kiewit More than 2,500 individuals registered for the 2023 Each day kicked o昀昀 with an external keynote Sustainability at Kiewit Kiewit Engineering Technical Summit. presentation that highlighted changes and trends in Kiewit’s markets. Our Projects The event took place in February and attendees included Kiewit engineers, external clients and university For Kiewit engineers and external attendees, the 2. Governance participants. There were 27 technical presentations Summit provided an excellent opportunity to share Corporate Governance throughout the virtual event. The event awarded more innovations, consider how Kiewit’s markets are than 8,800 total Professional Development Hours (PDHs). changing now, and how Kiewit is preparing to meet Supply Chain the needs of the rapidly evolving industry. The theme of the Summit focused on how Kiewit 3. Environmental Engineering Group (KEG) collaborates to execute This event is sponsored by the Chief Engineers Environmental Stewardship projects, share the best technology resources, and Council (CEC), a group of senior engineers continually adapt as the industry and markets transition. who represent the technical knowledge base of Greenhouse Gases & Kiewit’s core competencies and provide technical Energy Consumption Kiewit engineers presented project case studies, engineering leadership across all markets. technology innovations, and examples of Kiewit’s 4. Social holistic integrated approach to projects that leverage Health & Safety the company’s engineering capabilities. Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Technical Summit Metrics Appendix 2,2,500500 2727 8,88,80000 individuals registered technical presentations Professional Development Hours (PDHs) 75757575

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT “I’m a member of the heading excavation crews, Featured Stories where we’re excavating two tunnels through CONTINUEDCONTINUED the mountains for the Trans Mountain pipeline. During the course of my internship, I was able Message from Management Kiewit Internships continue to to gain first-hand experience with a variety of kickstart careers underground tunneling-related responsibilities, 1. Overview including surveying, installing ground support, Each year, hundreds of interns join Kiewit teams and drilling/loading and blasting.” About Kiewit in o昀昀ices and on projects across North America. Sustainability at Kiewit Read thoughts from a few of these interns and how their Kiewit internship is shaping their careers. PParkarker Ganer Gantterer Our Projects UnivUniverersisitty oy of Brif British Columbia Oktish Columbia Okanagananagan ((Civil Engineering)Civil Engineering) 2. Governance InIntternship Aernship Assignmenssignment: t: BriBritishtish Columbia, Columbia, TTrrans Mounans Mounttain Eain Expansionxpansion Corporate Governance 2023 Metrics PrProjecoject – Sprt – Spread 5Bead 5B Supply Chain 3. Environmental 1,1,154154 Environmental Stewardship Greenhouse Gases & interns “As an intern, my responsibilities revolve around taking Energy Consumption o昀昀 quantities of materials required for construction projects. By meticulously reviewing designs and 4. Social specifications, I calculate the quantities of materials 272272 such as concrete, steel and other vital components. Health & Safety This information serves as the foundation for e昀昀ective Diversity, Equity & Inclusion schools represented by interns procurement, scheduling and cost management. Talent & Workforce By collaborating closely with project managers and Development estimators, I ensure that accurate and up-to-date Community Engagement information is shared. This allows the construction teams to plan their activities, allocate resources and make Appendix informed decisions with precision and confidence.” PriyPriya Kinsagara Kinsagaraa ArizArizona Sona Sttaatte Unive Univerersisitty (y (ConsConstructructiontion 'Kiewit Internships continue to kickstart ManagemenManagement t and Tand Technologyechnology)) careers' continued on next page InIntternship Aernship Assignmenssignment: t: ColorColoradoado,, KieKiewiwit Int Infrfrasastructructturure Engineere Engineers os officeffice 76767676

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT “I worked as a civil field engineering intern “My role as an equipment intern is to update the residual energy control system for Kiewit’s last summer, and am grateful to have had the equipment. This system is implemented to protect opportunity to join the procurement team for these workers from injuries caused by energy stored in projects. My everyday work makes me understand Message from Management and learn more about how a project not only mobile equipment during maintenance. I have the opportunity to work with the maintenance team, involves day-to-day on-site operations, but also 1. Overview which has not only prepared me for a career in the behind-the-curtains work that tracks all of our About Kiewit equipment but has also taught me valuable skills expenses and makes sure we have everything at Sustainability at Kiewit in project management and problem solving.” hand to get the most out of what we spend.” Our Projects Angele DjollaAngele Djolla Gabriel AGabriel Aubryubry 2. Governance PPolyolyttechnic Monechnic Montrtreal (Induseal (Industrialtrial McGill UnivMcGill Univerersisitty (y (Civil Engineering)Civil Engineering) Engineering)Engineering) InIntternship Aernship Assignmenssignment: t: OnOnttarioario,, Corporate Governance InIntternship Aernship Assignmenssignment: t: QuebecQuebec,, LiLitttle Ltle Long and Smoky Fong and Smoky Falls Damalls Dam Supply Chain RRaglan Mineaglan Mine SSaaffeetty Pry Projecojecttss 3. Environmental Environmental Stewardship Greenhouse Gases & Energy Consumption “My day-to-day responsibilities vary, but I help create work packs, report how much work has been 4. Social done, assist with quality checks, order consumable Health & Safety supplies, and help out where I am needed that day. Diversity, Equity & Inclusion One of my favorite parts of the job has been applying knowledge from di昀昀erent engineering courses and Talent & Workforce using them together. I have also appreciated how Development serious everyone takes safety and that we discuss it Community Engagement every morning at stretch and flex with our team." Appendix NaNattalee Bralee Brakakee BenedicBenedictine College (Mechanicaltine College (Mechanical Engineering)Engineering) InIntternship Aernship Assignmenssignment: t: UtUtah,ah, InInttermounermounttain Pain Poowwer Prer Projecoject (IPPt (IPP) wi) withth TIC – TIC – The IndusThe Industrial Compantrial Companyy 77777777

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Featured Stories Supply Chain CONTINUEDCONTINUED 3. Environmental Building workforce development partnerships to promote career opportunities in the construction industry Environmental Stewardship Our Workforce Development team coordinates with ■ Southeast Lineman Training Center: The Southeast ■ Hiring Our Heroes: Hiring Our Heroes (HoH) connects Greenhouse Gases & our regional and local construction operations leaders Lineman Training Center (SLTC) is a premier the military community with American businesses Energy Consumption to identify the right partnerships for Kiewit to further training school for pre-apprentice lineworker to create economic opportunity and a strong and workforce development initiatives that bring more people training. SLTC provides students the opportunity diversified workforce. 4. Social into the construction industry. to build the foundational skills they need to succeed ■ Oklahoma State University Institute of Technology Health & Safety as lineworkers in electric utility and communications (OSUIT): OSUIT partners with global corporations to Examples of the groups we partner with include community industries. Diversity, Equity & Inclusion organizations – like employment centers and correctional develop academic coursework and practical training Talent & Workforce re-entry programs, industry associations, and vocational ■ Heavy Equipment Colleges of America: Heavy environments using industry-caliber equipment to Development schools. A few examples are shared below. Equipment Colleges of America (HEC) specializes create a seamless classroom-to-career transition. Community Engagement in training entry-level heavy equipment and crane We are specifically engaged with OSUIT’s two-year ■ Windham School District: Texas’s Windham School operators. HEC has four locations – Georgia, Truck Technician program. Appendix District operates 97 facilities within the Texas Oklahoma, California and Washington. Department of Criminal Justice. Windham provides ■ Skills USA: Skills USA is a workforce development Our engagement happens in many forms, like attending academic programs, career and technical education organization for students, which operates through career fair events, delivering presentations to students, and cognitive behavior programs to provide chapters in middle schools, high schools and college sponsoring student competitions and coordinating students the skills they need to secure employment and postsecondary institutions. executive leadership visits. We prioritize building strategic upon reentry. long-term relationships to deliver the most impact. 78787878

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain 3. Environmental Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Community Engagement Health & Safety Strategies Diversity, Equity & Inclusion ObjecObjectivtive:e: Shar Share timee time, t, talenalent and rt and resouresources wices with our communith our communitiesties.. ■ Donate to and encourage employee volunteering Talent & Workforce with organizations committed to community Development Our communities are shaped by the projects we build and the time, talent and treasure we share. Through our building, workforce readiness and education Community Engagement foundation, corporate support and localized outreach, we’re able to help non-profits, schools and community ■ Continuously improve processes for collecting partners. Each community is unique, with di昀昀erent priorities and needs, so we take the time to understand company giving and employee volunteering data Appendix the most meaningful ways we can give back in each one. We are proud to partner with several colleges and ■ Partner with universities on the Kiewit Scholars universities to develop and support scholarship programs building the next generation of construction and Program to build the next generation of engineering professionals. construction and engineering professionals 79797979

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT 2023 Progress ■ We continued to refine our processes for tracking this was done on an ad hoc basis. We have already 2023 Metrics Message from Management charitable donation data and continue to improve identified continued areas for improvement for the accuracy of this reporting. this process to make reporting quick and easy to 1. Overview ■ We held our first formal Kiewit Volunteers Month in encourage more reporting. $1$10.0.11 About Kiewit September. Read more on Pg. 81 about this initiative ■ We continued supporting the Kiewit Design-Build MILLIONMILLION Sustainability at Kiewit and some of the ways our employees volunteered in Program at University of Colorado Boulder and the charitable contributions from their communities. Kiewit Scholars programs at University of Nebraska- Kiewit Corporation and Kiewit Our Projects Lincoln, Purdue University and Iowa State University. Companies Foundation ■ We formalized a process that allows all employees to report company-sponsored volunteerism. Previously, Read more about these programs and their collective This figure is inclusive of all contributions made to 2. Governance impact on Pg. 88. 501(c)3 organizations, and to colleges and universities. Corporate Governance The figure includes donations made by the Kiewit Supply Chain Companies Foundation — a 501(c)(3), as well as Employees in Omaha volunteer at a diaper bank corporate sponsorships, and additional donations from 3. Environmental Kiewit project and office teams. College and university contributions include those made as part of our Thurgood Environmental Stewardship Marshall College Fund partnership, Kiewit Scholars, Greenhouse Gases & Women in Kiewit and Legacy Diversity Scholarships Energy Consumption programs, and through other commitments. 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 80808080

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories Message from Management Kiewit Volunteers Month honors Peter Kiewit’s legacy and leans into 1. Overview stewardship core value In September 2023, Kiewit teams from across the U.S., About Kiewit Canada and Mexico participated in the first Kiewit Sustainability at Kiewit Volunteers Month. The timing honored the legacy of Our Projects Peter Kiewit, whose birthday was September 12. In Omaha, Nebraska, employees volunteered to wrap In British Columbia, employees raised money for 2. Governance “Although volunteer e昀昀orts are welcome at any time, 21,960 diapers at the Nebraska Diaper Bank, which Kinsight, a not-for-profit supporting children and adults we’ve designated September as Kiewit Volunteers Month to provides diapers to low-income families while raising with developmental delays or disabilities, and Backpack Corporate Governance improve our visibility and understanding of volunteer e昀昀orts Supply Chain awareness of the basic health needs of diapers (pictured Buddies, which supplies economically disadvantaged across the company, and to build camaraderie around and above). children with food (pictured above). promote this important part of Kiewit’s culture,” said 3. Environmental CEO Rick Lanoha announcing Kiewit Volunteers Month. Environmental Stewardship Project and o昀昀ice teams were given the autonomy to Greenhouse Gases & select organizations that their employees are passionate Energy Consumption about. Our corporate Community A昀昀airs team hosted a webinar and provided other resources and best practices 4. Social to help teams make the most of their volunteer e昀昀orts. Health & Safety A new tracking tool rolled out to allow employees to report Diversity, Equity & Inclusion their volunteer e昀昀orts. Improvements for future iterations Talent & Workforce of the tool have already been identified. Employees also In Texas, a Women in Kiewit group on one of our In Denver, Colorado, employees worked on a variety Development shared their volunteerism on our company intranet tools. major transportation projects collected school supplies of projects on the Florence Crittenton campus. The Community Engagement (pictured above). organization’s mission is to educate, prepare and “Many of our teams already volunteer in their communities empower teen mothers and children (pictured above). Appendix year-round. They do it because they know it’s the right In New Jersey, employees volunteered at a farm field thing to do and aligns with our Core Values. While we day with MEVO, a youth-led organization with a mission will continue to encourage volunteerism all year, Kiewit to “help communities create social value change to 'Kiewit Volunteers Month honors Peter Kiewit's legacy and achieve a better and healthier future through strategic leans into stewardship core value' continued on next page Volunteers Month provides the opportunity for all of us to show our commitment to stewardship together and make volunteerism and directive education" (not pictured). an even greater impact,” said Lanoha. 81818181

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Nearly 200 employees volunteer Each representative then provided a list of projects that in the Ingleside, Texas, community they would like KOS to support. From there, Kiewit sta昀昀 1. Overview during Kiewit Volunteers Month chose the projects they wanted to volunteer for, some of which included: About Kiewit Kiewit O昀昀shore Services (KOS) is in the Gulf Coast Sustainability at Kiewit community of Ingleside, Texas. ■ Relocating flag poles in front of the City of Ingleside sign Our Projects When it came time to plan Kiewit Volunteers Month activities, KOS employees first met with community ■ Assembling and setting up new benches at Live 2. Governance organizations to understand their needs. Employees met Oak Park Corporate Governance with representatives from five organizations: ■ Building planter boxes and a storage shed for a community garden Supply Chain ■ The City of Ingleside ■ Reading to students 3. Environmental ■ Ingleside Independent School District ■ Assisting students with STEM projects Environmental Stewardship ■ Ingleside on the Bay ■ Serving as crosswalk guards at an elementary school Greenhouse Gases & ■ Taft Independent School District Energy Consumption ■ Aransas Pass Independent School District In total, nearly 200 sta昀昀 employees – or about half of the KOS sta昀昀 workforce – participated in these Kiewit 4. Social Volunteers Month events. Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 82828282

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Kiewit teams partner with Bridges creating improved access to essential services and to Prosperity to build two bridges economic development opportunities. 1. Overview in Rwanda Kiewit teams built both a suspension bridge and a About Kiewit Twenty employees traveled to Rwanda to build suspended bridge on the same trip. The Kirwa bridge is Sustainability at Kiewit a suspension and a suspended bridge with Bridges a 136 meter suspended bridge serving 1,240 community to Prosperity (B2P). members. The Musange-Kukibuga bridge is a 105 meter Our Projects suspension bridge serving 1,820 community members. Bridges to Prosperity is a nonprofit organization based Both bridges have their own unique story, with the Kirwa 2. Governance in Denver, Colorado, whose mission is to “create a world bridge being the longest suspended bridge B2P has built Corporate Governance where poverty caused by rural isolation no longer exists.” in Rwanda and the first suspended bridge Kiewit has built Supply Chain The organization builds bridges to provide access to in Rwanda since 2019. The Musange-Kukibuga bridge is education, health care and economic opportunity for built to support motorcycles to cross, which the team 3. Environmental communities living in destitute areas around the world. was able to witness on inauguration day. Environmental Stewardship By partnering with B2P, the 20 Kiewit volunteers were All the bridge materials and major team expenses Greenhouse Gases & able to provide members of the Gakenke district of were donated by both Kiewit and Bridges to Prosperity. Energy Consumption Rwanda with reliable and safe bridge crossings, To date, Kiewit teams have completed 13 bridges with the organization. 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development “The trip was very special – traveling to a new Community Engagement country, meeting new people, learning a new language, exchanging a new currency, but most Appendix of all tackling a great challenge. It was extremely demanding but even more rewarding,” said Project Engineer Zane Pointon. “I didn’t know a single person from my corporate team prior to coming here and now they feel like family.” 83838383

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Kiewit volunteers aim to increase literacy in urban core school 1. Overview Lee A Tolbert Community Academy (LACTA) is a charter About Kiewit school in the Kansas City Missouri Public School District. Sustainability at Kiewit LATCA serves nearly 500 children from the urban core Our Projects in kindergarten through 5th grade and is 100% Title I, meaning every student qualifies for free and reduced 2. Governance lunch. More than half of the students are reading below grade level. Corporate Governance Supply Chain Kiewit partnered with LATCA to reimagine reading space in the classroom. In partnership with LATCA Before 3. Environmental administrators, Kiewit leaders and volunteers began to imagine brightly colored walls, comfy reading nooks to Environmental Stewardship encourage the act of reading, and lots of books. Greenhouse Gases & Energy Consumption To make this happen, a total of $70,000 was granted to LACTA as combined gift from Kiewit and a personal 4. Social donation from a local Kiewit executive. Funds were used to purchase new books, mobile bookcases, furniture and Health & Safety more to update their hallways and reading spaces. Diversity, Equity & Inclusion Talent & Workforce Kiewit volunteers partnered with the student council Development to select colors for each hallway. Nearly 40 employees Community Engagement volunteered to help transform the hallways and reading nooks. Every core classroom teacher was also presented Appendix with a $250 classroom grant. 84848484 After

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management Honoring and serving Veterans 1. Overview In honor of Veterans Day, Kiewit made four $2,500 donations to organizations supporting veterans in About Kiewit our communities. Sustainability at Kiewit Our Projects Kiewit and Sound Transit partner to give local children a closer look at 2. Governance light rail construction In Colorado, the donation was made to Wreaths Corporate Governance Across America, which among other initiatives, Sound Transit’s Federal Way Link Extension Project Supply Chain “carries out its mission to Remember, Honor and in Federal Way, Washington, runs along several Teach by coordinating wreath-laying ceremonies neighborhoods. 3. Environmental In Nebraska, the donation was made to Midlands at more than 4,225 locations in all 50 U.S. states, To build relationships with those that are directly impacted Environmental Stewardship Community Foundation to support the building of a at sea and abroad.” by the construction, Kiewit and Sound Transit organized memorial for those who have served. The Midlands an event to discuss the importance of construction safety Greenhouse Gases & Community Foundation, “assists with community Energy Consumption development by improving and enhancing the quality and give the community a first-hand look at what is being of life for the residents of Sarpy and Cass counties.” built in their neighborhood. 4. Social Kiewit engineers led children and their caregivers on a tour Health & Safety to show the progress of the light rail extension construction Diversity, Equity & Inclusion so they can see what’s happening near their homes. Talent & Workforce During the tour, they learned about creek restoration Development Community Engagement happening underneath the light rail, walked on the In Kansas, the donation was made to Veterans bridge where the train will run in 2026, and learned Community Project, which provides “high quality about the di昀昀erent types of tracks we are constructing. Appendix and well-developed strategic services that enable In Texas, the donation was made to Henry’s The children enjoyed sitting in a forklift and watching Veterans to meet the challenges of day-to-day Home, which o昀昀ers a Horses & Heroes demonstrations on how it works. Children and caregivers living, resolve immediate crises, and move towards Equine Learning Program for veterans and also got to ride a double-decker Sound Transit bus to permanent stability.” first responders. and from the construction site, and keep their PPE to commemorate the experience. 85858585

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance In 2023, our Colorado colleagues made a $30,000 donation Employees in Mexico organized a donation drive to help Colleagues in Houston, Texas, cleaned up more than 20 Supply Chain to the Girl Scouts of Colorado and initiated plans for further those in need following Hurricane Otis, which hit Acapulco bags of waste at Terry Hershey Park. engagement between the two organizations, including in October 2023. The donations collected included food, 3. Environmental a Build Like a Girl event hosted in 2024. The goal is to water, clothing, and essential supplies, and they were quickly introduce the girl scouts to di昀昀erent careers in construction delivered to the communities most a昀昀ected by the hurricane. Environmental Stewardship and engineering through hands-on activities. Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 86868686

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance In the Pacific Northwest, Kiewit made a $25,000 donation Employees on Hawaii’s Lili'uokalani Community Center Supply Chain to Sustainable Northwest, whose mission is “bringing project team spent a Saturday in service, cleaning up entrepreneurial solutions to natural resources challenges several public areas near the project site in Honolulu. 3. Environmental to keep lands healthy and provide economic and community benefits.” Environmental Stewardship Greenhouse Gases & Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement In Toronto, Ontario, the King-Liberty project team organized Colleagues in Mexico collect plastic bottles and bottle caps. a fundraiser for the Parkdale Community Food Bank. The The bottles and caps are recycled to generate funds for Appendix team collected $4,555 CAD and a variety of non-perishable Casa de Amor, a home for children facing cancer and rare food for the foodbank, which serves over 8,000 families diseases in Veracruz. each month. 87878787

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED 2023 Metrics Message from Management Impact of university Kiewit Scholars programs continues to grow 1. Overview Through university partnerships, the Kiewit Scholars 116116 5555 3030 About Kiewit program, which started in the 2020-2021 academic year, participants in 2023-2024 interning/interned Sustainability at Kiewit provides students with opportunities and experiences to academic year summer 2024 employees engaged Our Projects help build their professional capabilities and networks, to prepare them to be leaders within Kiewit and the industry. 2. Governance The program includes scholarship support, leadership curriculum and industry mentorship, and internship 20232023--2022024 CLA4 CLASS BREAKDOSS BREAKDOWNWN Corporate Governance opportunities with Kiewit. It is supported by donations from Supply Chain Kiewit and executive leadership. 28 17 seniors freshmen 6060 3. Environmental Mentorship program builds employee and student connections male scholars Environmental Stewardship As part of the Kiewit Design-Build Program at University of Greenhouse Gases & Colorado Boulder, nearly 40 Kiewit employees participate Energy Consumption in a mentorship program with students. 4. Social Each year, the mentor program starts with a kick-o昀昀 event 37 33 5656 juniors sophomores female scholars Health & Safety at the Kiewit Lone Tree, Colorado, campus. Everyone enjoys a tour of the facility and has dinner together to meet Diversity, Equity & Inclusion mentors and set goals for the year. Talent & Workforce Development The mentors and mentees are encouraged to take 20232023--2022024 GRADU4 GRADUAATETESS Community Engagement ownership of their meetups, deciding together how frequently to meet, how to meet – in-person or virtual, and Appendix what to discuss. Some mentor/mentee pairs meet up in group settings throughout the year. 33 2525 December 2023 May 2024 'Impact of university Kiewit Scholars programs continues to grow' continued on next page 88888888

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Featured Stories CONTINUEDCONTINUED Message from Management In a survey of scholars, the mentorship program was most frequently noted as the most beneficial aspect of the 1. Overview program. About Kiewit A first-hand look at construction in action Sustainability at Kiewit Job site tours provide an opportunity for scholars to get Our Projects exposure to construction and engineering applications outside of the classroom and in the real world. Scholars 2. Governance from every university toured a jobsite in the 2023-2024 Adam Algahimi academic year. Corporate Governance Supply Chain As interns, scholars gain hands-on industry our e昀昀orts towards ensuring that Kiewit's boats, cranes, experience derrick barges, and other marine equipment, are both safe 3. Environmental During the summer of 2023, 45 Kiewit Scholars participants and e昀昀ective. interned with Kiewit. A few of them shared their Environmental Stewardship perspectives about the experience. My internship has been a wonderful experience so far, and it Greenhouse Gases & has taught me more about the construction/marine industry Energy Consumption then I had ever expected or hoped to learn. The hands-on “I'm Adam Algahimi, a rising sophomore from the University experience I have gained has been invaluable. Each day, I 4. Social of Nebraska-Lincoln, currently double majoring in become more familiar with the management side, but also Mechanical Engineering and Mathematics. with the engineering side, as I have been given the freedom Health & Safety to experiment and work with craftsmen whilst using Diversity, Equity & Inclusion This summer, I have had the incredible opportunity to intern AutoCAD and other modeling software. Talent & Workforce with Kiewit Equipment Services (KES) as they continue Development to support, manage, and troubleshoot Kiewit's rapidly The network of interns, engineers, managers and craftsmen Community Engagement expanding fleet of construction and marine equipment. The that I have had the opportunity to foster so far has likewise majority of our day-to-day responsibilities take place in been indispensable to my career and future as an engineer. Appendix Seattle, Washington, at Kiewit's very own marine yard. The men and women at Kiewit have allowed me to learn so Here, we spend each and every day managing and much, and yet have taught me that I still have a lot to learn. maintaining equipment to help support projects all along I have thoroughly enjoyed my time with Kiewit so far, and 'Impact of university Kiewit Scholars programs the Pacific Northwest (and even further out). While we also certainly expect to enjoy the rest of my summer here at the continues to grow' continued on next page maintain standard construction equipment, we mainly focus Seattle Marine Yard.” 89898989

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Message from Management 1. Overview About Kiewit Sustainability at Kiewit Our Projects 2. Governance Corporate Governance Supply Chain Rebeca Young 3. Environmental Environmental Stewardship Greenhouse Gases & “My name is Rebeca Young and I am a field/o昀昀ice engineer Energy Consumption intern for the I-205 Widening Abernethy Project in Oregon like WCT works was an outstanding opportunity, and it software, we focused on forecasting the cost report, looking City, Oregon. I am a rising junior at the University of taught me that there is nothing better than being prepared at the man hours/ man hour factor, and doing take-o昀昀s 4. Social Nebraska-Lincoln studying Civil Engineering! I am so and knowing your material — details and precision are the to see how much we have left to do this second season of Health & Safety grateful for this opportunity to be out in the field after key to success. work. Something that drives our whole schedule is the fish Diversity, Equity & Inclusion getting a wonderful experience in the Lenexa o昀昀ice last window that Oregon Department of Transportation (ODOT) year, and it has been truly mind-blowing connecting the As I learn more and more, I realize how much gave us, which opened July 10. Night shifts have started Talent & Workforce two worlds. masterminding it truly takes to get a project like this going. and the trestle crews are working continuously to meet our Development At Abernethy, there are so many di昀昀erent crews, subs, and Community Engagement I am currently working on the trestle at Abernethy, budget and meet the fish window. It's go time! client employees all working together. This takes huge specifically on the Kiewit Pacific Barge where I am coordination as you can imagine, especially due to the It has truly been an unforgettable experience here in Appendix recording pile drive logs for the pile driving that started scale of this project. Communication is crucial. Seeing the Oregon, and I cannot wait for the rest of the summer to yesterday afternoon. This, along with being sent to Astoria, craft look out for each other, the superintendents leading watch the trestle start to go up right before my eyes.” Oregon, to oversee WCT load up the Sunny Point barge with their crews, and the superintendents coordinating with our pile, are my two most favorite tasks that I have been each other at POD are all truly great examples for me to 'Impact of university Kiewit Scholars programs given. Driving up to Astoria and observing how a company remember in my future. This last month using di昀昀erent continues to grow' continued on next page 90909090

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Making the transition from school to career Now, as I sit in our o昀昀ice, it’s been a way for me to “One of the things that really attracted me to apply for the Several Kiewit Scholars have made the transition from understand this responsibility I have as a civil engineer scholarship and the program itself was the interdisciplinary student to full-time Kiewit employee. Autum Yang and and how my problem solving and hard work can really aspect of it, where people from di昀昀erent grades and majors Message from Management Mario Hanson all participated in the Kiewit Scholars make a di昀昀erence in the world. Seeing that during the all came together to work together, or at least got to build program at their universities in their final year of college Kiewit Scholars program was awesome. Those site visits a relationship with each other. Because in the real world, 1. Overview and then accepted full-time positions with Kiewit. They were really the first hands-on experiences I had in terms all of us come from di昀昀erent backgrounds. Being able to shared some of the ways they benefited from the Kiewit of design in-person. Prior to starting at Kiewit, my summer do that in college and understand how people think or About Kiewit Scholars program. Sustainability at Kiewit internships were just design work. I really didn't get to see what they're learning was a cool experience to have before what the e昀昀ect of that design work was out in the field. The we got out into the real world. I don't think other programs Our Projects thing that the Kiewit Scholars program really showed me really o昀昀er that.” "I appreciated the ways we could be involved. It was more was the e昀昀ect I have as an engineer, whether it's designer 2. Governance than just doing homework or doing assignments. It was or a field engineer.” AAututumn Yumn Yangang asking, “Why are things made the way they are? What is PPururdue Univdue Univerersisitty (y (ConsConstructruction Managemention Managementt)) Corporate Governance Mario HansonMario Hanson MaMay 2023 Gry 2023 Graduaaduattee Supply Chain the constructability behind a design?” When we're going Field EngineerField Engineer from design to the field, these are very basic fundamental ColorColorado Univado Univerersisitty Boulder (y Boulder (Civil Engineering)Civil Engineering) questions. I was starting to ponder and ask them in a way MaMay 2021 Gry 2021 Graduaaduattee 3. Environmental Civil/RCivil/Roadwoadwaay Engineery Engineer I hadn't really thought about before. Our project site visits Environmental Stewardship really stood out to me. We got to engage and ask questions Greenhouse Gases & with people that I wouldn't normally meet in a classroom. Energy Consumption 4. Social Health & Safety Diversity, Equity & Inclusion Talent & Workforce Development Community Engagement Appendix 91919191

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Appendix Section Subsection Data Point 2023 2022 2021 Message from Management Completion of Core Values Training %* 100% 98.6% 98.6% 1. Overview Completion of Anti-Bribery and Corruption Training %* 100% 98.9% 99.1% ce Corporate Governance n Completion of Antitrust Training %* 100% 98.8% 99.3% a About Kiewit n er v Completion of Diversity Contracting Training %* 100% 99.75% 99.25% o Sustainability at Kiewit G Dollars spent with DBE firms — U.S.* $1,068,055,756 $1,295,794,919 $1,245,523,980 Our Projects Supply Chain Percent of overall U.S. spend that went to DBE firms* 12% 20% 21% l ta 2. Governance n Scope 1 emissions (Metric tons CO2e) 609,567 468,510 451,470 e Greenhouse Gases & Energy nm ro Consumption i v Scope 2 emissions (Metric tons CO2e) 73,866 49,107 38,564 n Corporate Governance E Supply Chain Lost Time Incident Rate 0.05 0.03 0.06 Health & Safety Total Recordable Incident Rate 0.25 0.17 0.26 3. Environmental # of Project Goose Eggs — Projects that worked 200,000 hours or more without a recordable 23 24 23 Environmental Stewardship Gender Diversity (U.S. & Canada) — All employees % 14% 14% 12% Greenhouse Gases & Gender Diversity (U.S. & Canada) — Staff employees % 23% 23% 22% Energy Consumption Gender Diversity (U.S. & Canada) — Craft employees % 6% 5% 5% 4. Social Racial & Ethnic Diversity (U.S.) — All employees % 44% 41% 42% Health & Safety Racial & Ethnic Diversity (U.S.) — Staff employees % 27% 25% 24% Diversity, Equity & Inclusion Diversity, Equity & Inclusion Racial & Ethnic Diversity (U.S.) — Craft employees % 61% 57% 57% l a ci Military service member/Veteran (U.S.) — All employees % 4.8% 4.5% 4.8% Talent & Workforce o S Development Women in Kiewit and Legacy Diversity Scholarships — # of new scholarship recipients selected annually 12 10 6 Community Engagement Women in Kiewit and Legacy Diversity Scholarships — # total scholarship recipients funded annually (new + renewed) 32 27 21 Women in Kiewit and Legacy Diversity Scholarships — total $ invested annually $300,000 $220,000 $190,000 Appendix Women in Kiewit and Legacy Diversity Scholarships — # of recipients who have graduated through 2023 10 Women in Kiewit and Legacy Diversity Scholarships — # of graduates working full-time with Kiewit at year-end 2023 4 Women in Kiewit and Legacy Diversity Scholarships — total recipients — lifetime of program 44 Women in Kiewit and Legacy Diversity Scholarships — total $ invested — lifetime of program $1,005,000 * Excludes Weeks Marine Inc. in 2023 data point; Weeks Marine Inc. data is not included in any 2022 or 2021 data points 92929292

20220233 SSUUSTSTAAINAINABBILITILITY REY REPPORORTT Section Subsection Data Point 2023 2022 2021 Thurgood Marshall College Fund — # of Immersion Program participants 30 20 — Message from Management Thurgood Marshall College Fund — # of summer interns and scholarship recipients 19 (+1 full-time hire) 8 — Diversity, Equity & Inclusion Thurgood Marshall College Fund — # of HBCUs represented 10 10 — 1. Overview (continued) Future Women in Kiewit Summit — # of participants 105 95 97 About Kiewit Future Women in Kiewit Summit — # of universities/colleges represented 61 41 46 Sustainability at Kiewit Future Women in Kiewit Summit — # of offers accepted 64 — — Our Projects Annual hours of on-the-job, district and corporate training completed by full-time staff employees* 1,327,881 1,375,704 1,228,608 2. Governance Average annual spend per full-time staff employee on training and development* $7,845 $7,644 $7,512 NCCER — # of hours* 32,805 12,315 15,609 Corporate Governance Supply Chain NCCER — # of participants* 342 197 165 l % of qualifying employees received an annual performance and wage review 100% 100% 100% a Talent Development 3. Environmental ci % of full-time staff employees who completed a Right-Time Feedback check-in* 63% 67% 61% o S Environmental Stewardship $ invested in tuition reimbursement* $629,600 $577,900 $638,100 Greenhouse Gases & # of people who used tuition reimbursement* 177 167 199 Energy Consumption # of interns* 1,154 980 772 4. Social # of schools represented by interns* 272 220 218 Health & Safety Charitable Contributions — Kiewit Corporation + Kiewit Companies Foundation* $10.1 million $40.8 million $25 million Diversity, Equity & Inclusion Kiewit Scholars — # of Participants by Academic Year 116 96 48 Talent & Workforce Kiewit Scholars — Male Scholars 52% 48% — Development Community Kiewit Scholars — Female Scholars 48% 52% — Community Engagement Kiewit Scholars — Interned/Interning 55 45 28 Appendix Kiewit Scholars — Graduates by Academic Year 28 21 — Kiewit Scholars — # of employees engaged 30 42 — * Excludes Weeks Marine Inc. in 2023 data point; Weeks Marine Inc. data is not included in any 2022 or 2021 data points 93939393

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