Oil and Natural Gas Corporation Limited (ONGC) (incorporated on June 23, 1993) is an Indian public sector petroleum company. It is a Fortune Global 500 company ranked 335th, and contributes 77% of India's crude oil production and 81% of India's natural gas production. It is the highest profit making corporation in India. It was set up as a commission on August 14, 1956. Indian government holds 74.14% equity stake in this company.
ONGC is engaged in exploration and production activities. It is involved in exploring for and exploiting hydrocarbons in 26 sedimentary basins of India. It produces about 30% of India's crude oil requirement. It owns and operates more than 11,000 kilometers of pipelines in India. Until recently (March 2007) it was the largest company in terms of market cap in India