High Quality Content by WIKIPEDIA articles! The Oil and Natural Gas Corporation Limited (ONGC) (NSE: ONGC, BSE: 500312) is an Indian state-owned oil and gas company headquartered in New Delhi, India. It is one of the largest Asia-based oil and gas exploration and production companies, and produces around 77% of India's total crude oil production (and around 30% of total demand) and around 81% of natural gas production. It is one of the largest publicly traded companies by market capitalization in India and has the largest profits of any Indian company.