Cosmo Oil Company

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Cosmo Oil Company, Limited
Public corporation TYO: 5007
Industry Oil and gas
Founded Established 1939-09-04
Headquarters Tokyo, Japan
Key people
Yaichi Kimura, President
Products Petroleum
Natural gas
Motor fuels
Aviation fuels
Services Service stations
Revenue ¥2,831 billion (FY 2006)
Number of employees
1,916 (March 31, 2007)
Website (English)
A Cosmo service station in Osaka

Cosmo Oil Company, Limited (コスモ石油株式会社 Kosumo Sekiyu Kabushiki-gaisha?) is a Japanese petrochemical company.


Cosmo traces its corporate roots to Maruzen Petroleum (丸善石油株式会社), a company established in 1931, although the oil business operated by Maruzen was originally established by Zenzo Matsumura in Kobe in 1907.

Cosmo Oil Company was formed on April 1, 1986, through the merger of Maruzen Petroleum and Daikyo Petroleum, a group of oil businesses based in Niigata Prefecture which merged in 1939.

Explosion and fire at Cosmo refinery in Ichihara, Chiba, following the 11 March 2011 Tōhoku earthquake

A major fire occurred at the Cosmo refinery in Ichihara as a result of the 2011 Tōhoku earthquake.[1][2][3] It was extinguished after ten days, killing[citation needed] or injuring six people, and destroying storage tanks[4][5]


Cosmo operates four refineries, all of which are located in Japan:

  • Ichihara, Chiba (former Maruzen refinery): 240,000 barrels per day (38,000 m3/d)
  • Yokkaichi, Mie (former Daikyo refinery): 155,000 barrels per day (24,600 m3/d)
  • Sakaide, Kagawa (former Asia Oil refinery): 120,000 barrels per day (19,000 m3/d)
  • Sakai, Osaka (former Maruzen refinery): 80,000 barrels per day (13,000 m3/d)

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