Oil and Natural Gas Corp (ONGC) will buy government's 51.11 per cent stake in HPCL but will not have to make an open offer as the government's holding is being transferred to another state-run firm and the ownership isn't changing.
HPCL will become a subsidiary of ONGC and will remain a listed company post the acquisition, the source said adding the boad of the refining and marketing company will continue to remain in place.