Idemitsu Kosan Co., Ltd. is one of Japan’s leading petroleum refiners and integrated energy companies. Established in 1931 by entrepreneur Sazo Idemitsu, the company has its headquarters in Tokyo and has grown from a single refinery operator into a diversified energy and chemical business. Over its history, Idemitsu Kosan has played a pivotal role in Japan’s industrial development, consistently investing in refining capacity, petrochemical integration and research into advanced energy solutions.
The company’s core operations span the downstream petroleum value chain, including crude oil exploration, refining and the marketing of gasoline, diesel and aviation fuels. Idemitsu Kosan also produces a broad portfolio of petrochemical products—such as olefins, aromatics and synthetic resins—that serve the automotive, electronics and packaging industries. In addition, the company manufactures specialty lubricants, greases and functional fluids for industrial and automotive applications, leveraging proprietary additive technologies developed through its in-house research centers.
Outside Japan, Idemitsu Kosan maintains a strategic presence in Asia and beyond. Its operations include refining and storage facilities in Singapore and regional marketing networks that supply fuel products to retail dealers, commercial customers and maritime clients. The company’s international footprint is complemented by equity interests in upstream ventures across the Middle East and North America, providing diversified feedstock sources and contributing to supply chain resilience.
In recent years, Idemitsu Kosan has broadened its focus to include renewable energy and sustainability initiatives. These efforts encompass the development of biofuels, hydrogen energy solutions and photovoltaic power generation. Guided by a management team led by a president and a board of directors with deep industry experience, the company continues to pursue innovation in low-carbon technologies while maintaining operational excellence in its traditional energy and chemical businesses.
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