News Releases

HOUSTON, June 20, 2013 (GLOBE NEWSWIRE) -- Marathon Oil Corporation (NYSE: MRO) today announced it has published its "Living Our Values 2012 Corporate Social Responsibility (CSR) Report,"which provides information on the Company's non-financial performance and its actions to promote greater economic, social and environmental sustainability.

The new report reflects Marathon Oil's first full year as an independent international energy company and continues to highlight the Company's unwavering commitment to living its long-standing values of health and safety, environmental stewardship, honesty and integrity, corporate citizenship and a high performance team culture.

For the first time, the new report is available in a digital-only format at http://www.marathonoil.com/lov2012/, which allows the Company to expand its reporting. Marathon Oil also has adopted eight corporate-level commitments covering governance, society, environment and the workplace. For each commitment, the report outlines progress made in 2012 and primary activities planned for 2013.

"Our commitment to Marathon Oil's CSR principles runs deep throughout our entire Company," said Clarence P. Cazalot Jr., Marathon Oil's chairman, president and CEO. "Importantly, these elements of our business have been integrated into our day-to-day operations and, in this regard, our local operating teams are responsible for implementing programs to fulfill the commitments, including setting measurable goals to drive improvement. We believe this is the best way to have a positive impact in our communities."

Marathon Oil Corporation is an international exploration and production company. Based in Houston, Texas, the Company had net proved reserves at the end of 2012 of 2 billion barrels of oil equivalent in North America, Europe and Africa. The "Living Our Values 2012 Corporate Social Responsibility Report" at http://www.marathonoil.com/Social_Responsibility/Reporting and other information about Marathon Oil are available on the Company's website at http://www.marathonoil.com.

A photo accompanying this release is available at:
http://www.globenewswire.com/newsroom/prs/?pkgid=19441

In 2012, Marathon Oil undertook social investment programs focused on education and health care in Equatorial Guinea, where the Company has key base assets. These programs included the construction of two rural schools on Bioko Island and refurbishing a clinic to support public health. Additionally, in its ninth year, Marathon Oil's employee-sponsored Books for Bioko program continued to have a positive impact on primary and secondary students in seven schools on Bioko Island.

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