Indian Oil Corporation is India's largest commercial enterprise and petroleum company, accounting for nearly half of India's petroleum products market. It was formed in 1964 through the merger of Indian Refineries Ltd and traces its origins back to 1959. Indian Oil operates 10 of India's 22 refineries with a combined refining capacity of 65.7 million metric tons per year. Its mission is to serve national interests in oil and related sectors through continuous supplies while pursuing innovation, caring for communities, and high ethics.