| 1952: |
The Company was incorporated in the name of Standard Vacuum Refining Company of India Limited on July 5, 1952 |
| 1962: |
On 31st March,1962 the name was changed to ESSO Standard Refining Company of India Limited. |
| 1974: |
Hindustan Petroleum Corporation Limited comes into being after the takeover and merger of erstwhile Esso Standard and Lube India Limited |
| 1976: |
Caltex Oil Refining (India) Ltd. - CORIL is taken over by the Government of India with an Ordinance in 1976, subsequently ratified by an Act in 1977 and merged with HPCL in 1978. |
| 1979: |
Kosan Gas Company, the concessionaries of HPCL in the domestic LPG market, are taken over and merged with HPCL. |
| HPCL thus comes into being after merging four different organisations at different points of time. |
| Message of Mrs. Indira Gandhi, Prime Minister of India, to HPCL in 1974. |
| CEOs Who have shaped HPCL. |
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