BUSINESS PARTNER, SUPPLY CHAIN AND SOCIAL SUPPLIER STANDARDS The products manufactured in our refineries and developed along the supply chain significantly contribute to local, state and national economies. In keeping with our core value of honor, we choose business partners objectively and fairly and act with honesty in all business dealings. We comply with laws where we do business to ensure our supply chain standards meet minimum wage, child labor, right to associate or bargain collectively, and working-hour requirements. Business partners and suppliers are expected to comply with the contractual obligations and expectations in our Business Partner Principles of Conduct . These principles require our suppliers to work with our employees in a manner consistent with our values and our Code of Ethics. Priorities include fair wages, nondiscrimination, no human trafficking, anti- bribery, cybersecurity, and upholding all health, safety and environmental laws. Our procurement policy governs all our supply chain activities. We employ formal processes to consistently vet suppliers to protect people, ensure adherence to industry-standard frameworks for quality and monitor financial stability. Maintaining ongoing engagement with our suppliers helps ensure the continued safety, quality and sustainable delivery of goods and services to our operations. Understanding and monitoring the work conducted by our suppliers and business partners is integral to efficient and robust business operations, sustainability and respect for human rights. We audit suppliers’ manufacturing facilities and examine contracts within our supply chain to ensure adherence to policy. Our suppliers are expected to certify that the materials incorporated into products sold to Phillips 66 comply with all laws, including those pertaining to human rights, slavery and human trafficking. We engage with suppliers to enhance our operating performance through innovative products and the execution of continuous improvement opportunities. Supply Chain Sustainability Phillips 66 seeks to do business with diverse businesses across all our operations, and we are committed to providing equal and impartial opportunities. This approach stimulates local economic development and enhances our long- term business performance by improving supplier responsiveness, competition and sustainability. We actively participate in organizations that support the development of diverse businesses in the United States. This support includes our corporate memberships in the National Minority Supplier Development Council, the Women’s Business Enterprise National Council and active support of API diversity activities. Our goals encourage the expanded utilization of a diverse, sustainable supply base while delivering quality and competitive goods and services. We piloted supply chain sustainability training for our employees, highlighting items of impact and our initiatives. We anticipate offering training to all employees in the Procurement organization by the end of 2022. POLITICAL AND PUBLIC POLICY PROCESS Phillips 66 participates in the U.S. legislative and regulatory policy development and political process to serve the best interests of our shareholders, our workforce and other stakeholders. Our operations are highly regulated and are affected by actions at many levels of government. Our public policy activities include education and advocacy efforts at the local, state and federal levels. We are also committed to complying with all applicable state and federal rules on lobbying and disclosures. Our Political Giving and Activity Policy governs our actions. It discloses political activity by the board of directors and management and lays out the criteria by which we evaluate contributions made over the past five years. In addition, the board’s Public Policy and Sustainability Committee has oversight of political risks and receives updates from the board throughout the year. ADVANCING SUPPLIER DIVERSITY We advanced our supplier diversity program by establishing collaborative relationships, developing digital tools, providing data visibility and establishing internal metrics for diverse supplier benchmarking and utilization in alignment with our business needs. In 2021, we developed a dashboard that allows business units to analyze their current supplier diversity landscape. We increased our Tier 1 and 2 supplier reporting program to engage with and advance our efforts. 42 PHILLIPS 66 2022 SUSTAINABILITY REPORT OUR BUSINESSES: TODAY AND TOMORROW ENVIRONMENT AND SAFETY GOVERNANCE STAKEHOLDER ENGAGEMENT