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