The Idemitsu Kosan Company, Ltd. (出光興産株式会社, Idemitsu Kōsan kabushiki gaisha, stylized in logo as idemitsu) is a Japanese petroleum company. It owns and operates oil platforms, refineries, produces and sells petroleum, oils and petrochemical products,[3] and also operates gas stations under the apollostation[a] brand and (until 2023) in its own Idemitsu and Shell brands, the latter under license from Royal Dutch Shell.
Idemitsu is the second largest petroleum refiner in Japan, after Eneos.[4] It was ranked as the 262nd largest company in the world by revenue in Fortune Global 500 (2008).[2] It is number 26 in petroleum refining.[5] Idemitsu Kosan is listed in the First Section of the Tokyo Stock Exchange and, since absorbing Showa Shell Sekiyu in 2019, is a constituent of the Nikkei 225 index; however, it is not a constituent of the TOPIX 100 index (instead, it is a constituent of the TOPIX Mid400 index).[6]