Elements of the TonenGeneral Group began operations in Japan in 1893.
We take pride in the diversity that characterizes our history of over 120 years.

Standard Oil Company of New York (Socony) opened its first Japanese branch in Yokohama in 1893 to import and sell kerosene at a time when kerosene lamps were still used for lighting. Vacuum Oil Company also opened a branch in Yokohama that same year. Vacuum Oil’s high-grade lubricants and technical services were factors in bringing Japan’s textile spinning industry to world prominence. This was the origin of our petroleum product sales under the Esso and Mobil brands. In 1939, Toa Nenryo Kogyo K.K. was established through joint capital investment to manufacture aviation gasoline and aviation lubricants, then regarded as high-tech products. Toa Nenryo Kogyo, a petroleum refining company, founded Tonen Sekiyu Kagaku in 1960 to expand its business into the petrochemical industry during the high-growth period of the Japanese economy. In 1947, General Bussan was formed from the fuel business of MITSUI & CO., LTD. when it became independent after the dissolution of the zaibatsu conglomerates. The company was involved in the sale of petroleum products under the General brand and later expanded its operations to include petroleum refining.


Vacuum Oil (U.S.) Japan branch
Socony (U.S.) Japan branch
Socony-Vacuum (U.S.) Japan branch
Stanvac (U.S.) Japan branch
Toa Nenryo Kogyo K.K. (changed to Tonen K.K. in 1989)
Toa Nenryo Kogyo was founded jointly by eight Japanese petroleum companies to produce aviation gasoline and lubricants.


General Bussan K.K.
With the dissolution of zaibatsu groups in Japan, the fuel division of MITSUI & CO., LTD. became independent as General Bussan (later General Sekiyu K.K.) and was certified as a motouri.
Partnership between Toa Nenryo Kogyo and Stanvac
Toa Nenryo Kogyo formed a partnership with Stanvac to introduce Standard Oil technology. Stanvac acquired 51% of Toa’s shares (later reduced to 50%).
General Sekiyu K.K.


Tonen Sekiyu Kagaku (now Tonen Chemical Corporation)

Mobil Sekiyu K.K.
Esso Standard Sekiyu K.K.
Mobil Sekiyu and Esso Sekiyu established with the dissolution of Stanvac.

Mitsui Oil Supply Company, Limited
Established as a wholly owned subsidiary of MITSUI & CO., LTD.

Nitto Unicar Company Limited
Established as a joint company of Nitto Chemical Industry Co., Ltd. and Union Carbide Corporation (currently Dow Chemical).

Kyokuto Petroleum Industries K.K. (now Kyokuto Petroleum Industries, Ltd.)
Mobil Sekiyu and MITSUI OIL invested equally in the establishment of Kyokuto Petroleum Industries, a petroleum refining specialist.
Nippon Unicar Company Limited
Mitsubishi Rayon Co., Ltd. became the Japanese shareholder in 1965. Nitto Unicar renamed Nippon Unicar Company Limited in 1966.


Tonen Sekiyu Kagaku (currently Tonen Chemical Corporation) became the Japanese shareholder in 1980.
Esso Sekiyu K.K.

Mobil Sekiyu, Esso Sekiyu, Tonen, and General Sekiyu, which made great contributions to Japan’s economy during its era of rapid economic growth, merged to form the ExxonMobil Japan Group in July 2000. The capital structure, however, remained divided, with ExxonMobil Yugen Kaisha wholly owned by ExxonMobil and ExxonMobil Yugen Kaisha possessing 50.02% of shares in TonenGeneral Sekiyu, which is listed on the First Section of the Tokyo Stock Exchange.
In June 2012, the TonenGeneral Group was created with TonenGeneral Sekiyu at its center, effectively integrating production and sales. The TonenGeneral Group subsequently strengthened its business with the addition of Nippon Unicar (currently NUC Corporation), MOC Marketing and Kyokuto Petroleum Industries (the sales business of MOC Marketing was subsequently transferred to and integrated with EMG Marketing, and Kyokuto Petroleum Industries was acquired by TonenGeneral Sekiyu through an absorption-type merger). In addition, the EMG Marketing LP gas sales business has been transferred to Gyxis Corporation, an LP gas distributor established in April 2015.


TonenGeneral Sekiyu K.K. Tonen and General Sekiyu merged to become TonenGeneral Sekiyu.
ExxonMobil Yugen Kaisha
With the merger of U.S. companies Exxon and Mobil in 1999, the Japanese companies they had invested in were also restructured.
EMG Marketing Godo Kaisha
Integrated management as the TonenGeneral Group with TonenGeneral Sekiyu’s acquisition of 99% of EMG Marketing shares in June, making EMG Marketing a TonenGeneral Sekiyu subsidiary.
NUC Corporation Nippon Unicar Limited became a wholly owned subsidiary of TonenGeneral Sekiyu and was renamed NUC Corporation with the acquisition of shares owned by Dow Chemical.
MOC Marketing Godo Kaisha
Sales business of MOC Marketing transferred to and integrated with EMG Marketing in July.
MITSUI OIL shares transferred to TonenGeneral Sekiyu under agreement by TonenGeneral Sekiyu and MITSUI & CO., LTD. MITSUI OIL and Kyokuto Petroleum Industries became subsidiaries of TonenGeneral Sekiyu in February.
Kyokuto Petroleum Industries acquired by TonenGeneral Sekiyu through an absorption-type merger in July.
TonenGeneral Sekiyu executed a business integration agreement and other agreements with JX Holdings, Inc., in August.
EMG Marketing acquired by TonenGeneral Sekiyu through an absorption-type merger in January.