| Date | Main Developments in the Company's Business |
|---|---|
| 1888 | Nippon Oil established |
| 1914 | Oil first gushed out of Kurokawa Oil Well No. 5 in Akita Prefecture |
| 1921 | Nippon Oil merged with Hoden Oil |
| 1931 | Mitsubishi Oil established jointly by three Mitsubishi group companies (headquarters, mining, trading) and Associated Oil (later known as Getty Oil) in the United States |
| 1933 | Koa Oil established |
| 1941 | Nippon Oil merged with Ogura Oil |
| 1951 | Nippon Petroleum Refining established jointly by Nippon Oil and Caltex |
| 1967 | Nippon Oil Staging Terminal established |
| 1968 | Tohoku Oil established |
| 1973 | Okinawa CTS established |
| 1984 | All Getty Oil-owned Mitsubishi Oil shares transferred to Mitsubishi group companies Business alliance formed between Nippon Oil and Mitsubishi Oil |
| 1995 | Business alliance formed between Nippon Oil and Idemitsu Kosan |
| 1996 | Nippon Oil terminated business alliance with Caltex and acquired a full stake in Nippon Petroleum Refining |
| 1998 | Crude oil production started at Rang Dong Oil Field offshore Vietnam |
| 1999 | Nippon Oil and Mitsubishi Oil merged to form Nisseki Mitsubishi Business alliance formed between Nisseki Mitsubishi and COSMO Oil |
| 2001 | New Service Station brand ENEOS launched |
| 2002 | Nisseki Mitsubishi Refining, Koa Oil and Tohoku Oil merged into Nippon Petroleum Refining Nisseki Mitsubishi renamed Nippon Oil |
| 2003 | Natural gas production started offshore Malaysia (Helang Gas Field) |
| 2004 | Consignment refining contract signed with China Oil |
| 2005 | Nippon Oil merged with Nippon Petroleum Gas |
| 2006 | Business alliance formed with Japan Energy Capital tie-up formed with INPEX Holdings Nippon Petroleum Refining merged with Nippon Petroleum Processing |
| 2007 | Business/capital alliance formed with SK Corporation (South Korea) A memorandum of understanding regarding long-term collaboration with China National Petroleum Corporation is concluded |
| 2008 | Nippon Petroleum Refining merged with Nippon Petrochemicals ENEOS CELLTECH, a joint company with Sanyo Electric Company for stationary fuel cells, established Nippon Oil integrated its business with Kyushu Oil Conclusion of Memorandum on Business Integration with Nippon Mining Holdings |
| 2009 | SANYO ENEOS Solar, a joint company with Sanyo Electric Company for the production and sale of thin-film solar panels, established |
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