Oil & Natural Gas Corp. Ltd. engages in the exploration, development, and production of crude oil, natural gas, and value added products. The company is headquartered in New Delhi, Delhi and currently employs 25,993 full-time employees.  The firm's business segments include Exploration and Production, and Refining and Marketing. The firm is engaged in exploration, development and production of crude oil, natural gas and value-added products in India and acquisition of oil and gas acreages outside India for exploration, development and production, downstream (refining and marketing of petroleum products), petrochemicals, power generation, LNG supply, pipeline transportation, special economic zone (SEZ) development and helicopter services. The firm's products and services include crude oil, natural gas, liquid petroleum gas and other products. Its geographical segments consist of India, which includes offshore and onshore, and Outside India. Its subsidiaries include Mangalore Refinery and Petrochemicals Limited, Hindustan Petroleum Corporation Limited, ONGC Videsh Limited, Petronet MHB Limited and HPCL Biofuels Limited.

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