Oil India Limited is an Indian public sector company and the second largest hydrocarbon exploration and production company in India. It was formed in 1881 and is headquartered in Duliajan, Assam. The company operates under the control of the Ministry of Petroleum and Natural Gas. Oil India Limited explores for and produces crude oil and natural gas in India and overseas. It is classified as a Navratna PSU and has shares listed on the Bombay Stock Exchange and National Stock Exchange of India. The Government of India owns 67.64% shares in the company.