Idemitsu Kosan Co., Ltd. is a Japanese petroleum company. It owns and operates oil platforms, refineries, produces and sells petroleum, oils and petrochemical products, and also operates gas stations under the apollostation brand and until 2023, in its own Idemitsu and Shell brands; the Shell brand being used under the license of Royal Dutch Shell. Idemitsu is the second largest petroleum refiner in Japan, after Eneos. It was ranked as the 262nd largest company in the world by revenue in Fortune Global 500. It is number 26 in petroleum refining. 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. Wikipedia