Marathon Oil
American company engaged in hydrocarbon exploration headquartered in Houston
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| November 2024 | Marathon Oil was acquired by ConocoPhillips and absorbed into the company. |
| July 2024 | Marathon Oil agreed to a $241.5 million settlement with the US Department of Justice and EPA, resolving allegations of environmental permit violations and illegal air pollution at oil and gas facilities on the Fort Berthold Indian Reservation in North Dakota. The settlement included a $64.5 million civil penalty (the largest ever for Clean Air Act violations from stationary sources) and a $177 million investment to bring facilities into compliance. |
| December 2022 | Marathon acquired Eagle Ford assets from Ensign Natural Resources for $3.0 billion in cash. |
| 2019 | Lee M. Tillman becomes Chairman of the Board, succeeding Dennis H. Reilley and serving until 2024. |
| March 2018 | Marathon sold its assets in Libya to TotalEnergies SE for $450 million. |
| 2017 | A study was published documenting Marathon Oil's environmental impact, revealing its significant greenhouse gas emissions from 1988 to 2015. |
| 2017 | Marathon sold its Athabasca oil sands interests for $2.5 billion and acquired Permian Basin assets for $1.2 billion. |
| 2015 | End of tracking period for Marathon Oil's global industrial greenhouse gas emissions, which were found to be 0.19% of global emissions and ranked as the seventh-largest emitter in the oil and gas industry. |
| October 2014 | The company sold its business in Norway to Det Norske Oljeselskap ASA for $2.1 billion. |
| 2013 | Dennis H. Reilley becomes Chairman of the Board, succeeding Clarence P. Cazalot, Jr. and serving until 2019. |
| 2013 | Lee M. Tillman becomes President of Marathon Oil, taking over from Clarence P. Cazalot, Jr. and serving until 2024. |
| September 2013 | Marathon sold a 10% stake in an offshore Angolan oil and gas field to Sonangol Group for $590 million. |
| June 2013 | Marathon sold its Angolan oil and gas field to Sinopec for $1.52 billion. |
| 2011 | Clarence P. Cazalot, Jr. becomes Chairman of the Board, succeeding Thomas J. Usher and serving until 2013. |
| 2011 | Marathon Oil spun off its downstream operations as Marathon Petroleum. |
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