At the end of trade, ONGC commanded market value of Rs 2,79,208 crore. This is about Rs 4,787 crore more than TCS's m-cap of Rs 2,74,421 crore.
Shares of ONGC ended on a flat note down 0.09 per cent, while TCS lost 1.92 per cent.
Last week, on Thursday, ONGC overtook TCS in market value. But, the energy major's rein at the top position proved to be short-lived with the IT major reclaiming the coveted position on Monday.
Reliance Industries with a market capitalisation of Rs 2,65,102 crore was at third place, followed by ITC (Rs 2,52,977 crore) and Coal India (Rs 2,00,260 crore).
Market capitalisation or the value of a listed company is arrived at by multiplying the total number of its shares with its stock price on a particular day or time. This figure changes daily with the change in the stock price.