ENEOS Corporation is a prominent Japanese integrated energy company, established in 1888 and headquartered in Tokyo. As Japan's largest energy provider, it operates across the entire energy value chain, including petroleum refining, oil and natural gas exploration, petrochemicals, and metals production. ENEOS is a core subsidiary of ENEOS Holdings, Inc., which employs over 40,000 people globally.

The company runs multiple refineries in Japan and is involved in upstream activities through subsidiaries like JX Nippon Oil & Gas Exploration. ENEOS manufactures a variety of high-performance motor oils and synthetic lubricants, marketed under the ENEOS and SUSTINA brands. It also focuses on developing renewable energy solutions, hydrogen, and carbon-neutral fuels, reflecting its commitment to environmental sustainability. ENEOS serves a diverse customer base, including automotive manufacturers, industrial clients, and retail consumers, with a presence in global markets.