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IK
International Oil Company
Integrated
TYO: 5019
Idemitsu Kosan
Tokyo, Japan · Established 1911 · Profile updated July 1, 2026
Official website ↗Auditor Executive Assessment
Prepared by the Asian Oil Intelligence Desk · Institutional due-diligence memorandum
Idemitsu Kosan Co., Ltd. is Japan's second-largest oil company following merger with Showa Shell Sekiyu, operating Tokuyama and Chiba refineries, 6,400+ retail stations, and lubricants leadership. Solar and geothermal investments diversify beyond petroleum.
FY2024 revenue approximated $55 billion with net income near $1.5 billion. Showa Shell integration completed in 2019 created scale to compete with ENEOS. Lubricants division holds top market share in Japan and Asia.
Agricultural chemicals a...
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