RIL commanded a market value of Rs 246,995 crore (Rs 2,469.95 billion) at 0945 hours on the Bombay Stock Exchange, which was higher than any other listed company.
In comparison, the market value of Coal India, which had dethroned RIL to emerge as the country's most-valued firm last week, stood at Rs 244,190 crore (Rs 2,441.9 billion) at the same time.
Another state-run company, Oil and Natural Gas Corporation, was close behind at third position, with a market value of Rs 243,831 crore (Rs 2,438.31 billion).
Shares of all three companies was trading in the red on Tuesday, but the losses were sharper for CIL.
While RIL was down 0.26 per cent at Rs 754.30, ONGC was down 0.62 per cent at Rs 285 and CIL was 2.2 per cent in the red at Rs 386.60.
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