| 1939 |
Established under national policy as a manufacturer of aviation fuel and lubricants for the military. |
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| 1941 |
Wakayama Refinery established. |
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| 1944 |
Shimizu Refinery established. |
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| 1947 | | General Sekiyu K.K. established and started importing / exporting and marketing petroleum products. |
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| 1949 |
Affiliation agreement concluded with Standard Vacuum Oil Company (predecessor of ExxonMobil). |
Company designated as an oil refining and supply company. |
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| 1950 | - Reopening of Wakayama Refinery and Shimizu Refinery after repair of war damage.
- Stock listed on the Tokyo Stock Exchange.
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| 1952 | | Contract concluded with Standard Vacuum Oil Company for supply and consignment sales of petroleum products. |
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| 1953 | | Stock listed on Tokyo Stock Exchange. |
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| 1960 |
Tonen Chemical Corporation (100% subsidiary) established. |
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| 1962 |
Kawasaki Refinery established. |
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| 1965 | | Sakai Refinery established. |
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| 1972 | Equity participation in Kygnus Sekiyu K.K. |
Equity participation in Nansei Sekiyu K.K. |
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| 1984 | | Formed an alliance with Esso Sekiyu K.K. for joint delivery operations by tank truck and the consolidation of oil terminals. |
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| 1987 |
Shut down of refining operations at Shimizu Refinery and conversion to terminal. |
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| 1988 | | Introduction of first membership card in Japanese oil business |
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| 1999 | | - Concluded Mutual Consignment Contract with Esso Sekiyu K.K. and Showa Shell Sekiyu K.K. for product shipping.
- Concluded Mutual Services Provision Agreement with Esso Sekiyu K.K.
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| 2000 |
TonenGeneral Sekiyu K.K. formed. |
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- Conclued service agreements with ExxonMobil Business Services Private Ltd., ExxonMobil Marketing Services Private Ltd., Esso Sekiyu Private Ltd. and Mobil Sekiyu Private Ltd.
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| 2002 | Consolidation of Esso Sekiyu Private Ltd., Mobil Sekiyu Private Ltd., ExxonMobil Marketing Services Private Ltd., and ExxonMobil Business Services Private Ltd. to form ExxonMobil Y.K. (entrustment of sales and administrative operations to ExxonMobil Y.K.) |
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| 2004 | Transfer of equity holdings in Kygnus Sekiyu K.K. to San-ai Sekiyu K.K. |
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| 2008 |
Sold all shares in Nansei Sekiyu Kabushiki Kaisha to Petrobras International Braspetro B.V. |
| 2010 |
Establishment of Toray Tonen Specialty Separator G.K. (50% ownership) through a contribution by Toray Industries, Inc. into Tonen Specialty Godo Kaisha, a wholly owned subsidiary |
