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Coal India Limited is an Indian central public sector undertaking under the ownership of the Ministry of Coal, Government of India. It is headquartered at Kolkata. It is the largest government-owned-coal-producer in the world. It is also the seventh largest employer in India with nearly 272,000 employees. Wikipedia

CEO: Pramod Agrawal (1 Feb 2020–)

Founded: November 1975

Founder: Government of India

Headquarters: Kolkata

Number of employees: 2,48,550 (2022)

Revenue: 1.14 lakh crores INR (US$15 billion, 2022)

Subsidiaries: Bharat Coking Coal, Central Coalfields, Mahanadi Coalfields, more.....🇮🇳🇮🇳🇮🇳

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Indian Oil Corporation Limited is an Indian central public sector undertaking under the ownership of the Ministry of Petroleum and Natural Gas, Government of India. It is headquartered in New Delhi. It is a public sector undertaking whose operations are overseen by the Ministry of Petroleum and Natural Gas. Wikipedia

Founded: 30 June 1959

Headquarters: New Delhi

Number of employees: 31,254 (2022)

Revenue: 7.37 lakh crores INR (US$92 billion, 2022)

Subsidiaries: Chennai Petroleum Corporation Limited, Lanka IOC, more

The Oil and Natural Gas Corporation is an Indian central public sector undertaking under the ownership of Ministry of Petroleum and Natural Gas, Government of India. It is headquartered in Dehradun. ONGC was founded on 14 August 1956 by the Government of India. Wikipedia

Founded: 14 August 1956

Headquarters: Vasant Kunj, New Delhi

Number of employees: 27,165 (2022)

Revenue: 5.39 lakh crores INR (US$71 billion, 2022)

Subsidiaries: Hindustan Petroleum, Mangalore Refinery and Petrochemicals Limited, more...

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Hindustan Petroleum Corporation Limited, commonly referred to as HP, is an Indian oil and gas refining company headquartered in Mumbai. Since 2018, ONGC has owned a majority stake in the company. The company is ranked 367th on the Fortune Global 500 list of the world's biggest corporations as of 2016. Wikipedia.Founded: 1974

Headquarters: Mumbai

Number of employees: 9,065 (2022)

Parent organization: Oil and Natural Gas Corporation

Revenue: 3.52 lakh crores INR (US$46 billion, 2022)

Subsidiaries: HPCL Rajasthan Refinery Limited, HPCL Shapoorji Energy Private

Bharat Petroleum Corporation Limited is an Indian central public sector undertaking under the ownership of Ministry of Petroleum and Natural Gas, Government of India. It operates three refineries in Bina, Kochi and Mumbai. Wikipedia

Founded: 1952

Headquarters: Mumbai

Number of employees: 8,594 (2022)

Revenue: 4.33 lakh crores INR (US$57 billion, 2022)

Subsidiaries: BPCL Kochi Refinery, Bharat Oman Refinery Limited, more..

GAIL Limited is a central public sector undertaking under the ownership of Ministry of Petroleum and Natural Gas, Government of India. It is headquartered in GAIL Bhawan, New Delhi. Its operations are overseen by the Ministry of Petroleum and Natural Gas. Wikipedia

Founded: 1984

Headquarters: New Delhi

Number of employees: 4,754 (2022)

Revenue: 93,942 crores INR (US$12 billion, 2022)

Subsidiaries: Brahmaputra Cracker and Polymer Limited, GAILTEL, Aavantika Gas, more..