Marathon Petroleum Corporation (NYSE: MPC) and its midstream affiliate MPLX LP (NYSE: MPLX) have published their Sustainability Report and Perspectives on Climate-Related Scenarios, two joint reports that detail the companies’ progress on sustainability-related goals and the risks and opportunities they see stemming from the ongoing evolution of the global energy industry.

2025 Sustainability Report

The Marathon and MPLX Sustainability Report provides details on the companies’ work to advance environmental stewardship, empower their people, engage with stakeholders and communities, and execute their work with integrity. In doing so, the report encompasses topics as diverse as greenhouse gas (GHG) emissions and freshwater withdrawal goals, energy efficiency programs, landscape conservation, spill and pollution prevention, continually reinforcing a culture of safety, investing in their employees and communities, and maintaining accountable and transparent governance.

“When our facilities operate safely, reliably and with strong environmental performance, they help support the availability of affordable, reliable fuels – an important component of the shared value we strive to create,” said Maryann Mannen, chairman, president and CEO of MPC and MPLX. “I am proud that our talented and dedicated workforce achieved record safety and environmental performance in 2025.”

The 2025 Sustainability Report highlights a wide variety of company accomplishments, some of the most prominent of which include:

• The lowest U.S. Occupational Safety and Health Administration (OSHA) recordable injury rate and the lowest number of designated environmental incidents in seven years.
• Eight of Marathon’s 13 refineries earned safety awards from the American Fuel and Petrochemical Manufacturers (AFPM), and its Detroit refinery earned AFPM’s highest honor.
• Marathon and MPLX achieved their 2030 GHG and freshwater withdrawal goals five years ahead of schedule.
• MPLX achieved a 68% reduction in methane emissions intensity from 2016 levels.
• Marathon Pipe Line, an MPLX subsidiary, achieved its biodiversity target by cultivating sustainable landscapes on over 10,000 acres of pipeline right of way.
• Marathon refineries have earned more ENERGY STAR® certifications for energy efficiency than all other U.S. refiners combined.
• Marathon’s employees reported approximately 60,000 volunteer hours and joined with the company and its fundraising partners to invest $35 million in the communities where the company operates.
• In a companywide poll, 95% of employees said they feel it’s safe to speak up on compliance and ethics matters, and 99% said Marathon clearly communicates its expectations of ethical behavior.

The 2025 Sustainability Report is available at: https://www.marathonpetroleum.com/content/documents/Responsibility/Sustainability_Report/2025_SustainabilityReport.pdf

2026 Climate Perspectives

Published every year since 2017, the companies’ Climate Perspectives report represents an ongoing commitment to transparency regarding its progress in advancing solutions that improve environmental impact, strengthen operational resilience and support long-term business performance.

As rising energy demand, evolving policy expectations, geopolitical uncertainty and other factors drive significant change throughout the global energy system, the 2026 report provides an analysis of how Marathon and MPLX are positioned to navigate evolving market and policy dynamics, including climate-related transition risks. The report considers a variety of long-term and short-term scenarios from the International Energy Agency, the Intergovernmental Panel on Climate Change and other sources such as the U.S. Energy Information Administration and private consultancies, identifying transition risks, physical risks, and potential opportunities that could result from the scenarios.

The report also provides visibility to the companies’ progress on important climate-related goals, such as their early completion of 2030 GHG and freshwater withdrawal goals, methane emissions intensity reductions, and industry-leading ENERGY STAR certifications for Marathon’s refineries.

“We believe our 13 refineries are positioned well as the energy industry continues to evolve, including in hypothetical carbon-constrained scenarios,” said Mannen. “Not only does the U.S. refining industry maintain a structural cost advantage relative to global competitors – MPC’s refineries in particular operate in a geographically diverse footprint and include an integrated logistics network, enhancing our operational adaptability, cost competitiveness, and financial resilience. As we face the risks and opportunities of an ever-evolving energy industry, we are confident that we continue to position MPC and MPLX well.”

The 2026 Perspectives on Climate-Related Scenarios publication is available at https://www.marathonpetroleum.com/content/documents/Responsibility/2026-MPC-MPLX-ClimateReport.pdf