The combined market value of top eight Sensex companies surged by Rs 35,882 crore in tandem with a bullish stock market last week, with NTPC alone adding Rs 10,926 crore.
Coal India and Bharti Airtel, however, saw erosions in their market capitalisation (m-cap) in an otherwise positive stock market where the benchmark Sensex gained 2.13%.
The market value of NTPC soared Rs 10,926 crore to Rs 1,37,122 crore. Shares of the company rose by 8.65% during last week.
After NTPC, RIL was the second biggest gainer in the list as it added Rs 7,368 crore taking its M-cap to Rs 2,43,266 crore.
On Wednesday, Reliance Industries had toppled state-run oil company ONGC to become the country's most valued firm.
The M-cap of SBI moved up by Rs 4,318 crore to Rs 1,34,581 crore, while that of ITC advanced Rs 3,870 crore to Rs 2,02,770 crore.
Infosys' value rose by Rs 3,471 crore to Rs 1,26,864 crore and ONGC's climbed Rs 2,609 crore to Rs 2,39,938 crore.
TCS added Rs 2,378 crore to its M-cap which was Rs 2,42,284 crore, while HDFC Bank's value jumped Rs 942 crore to Rs 1,38,496 crore.
In contrast, CIL's market cap dropped Rs 6,158 crore to Rs 2,17,251 crore, while that of Bharti slipped Rs 4,007 crore to Rs 1,12,577 crore.
Last week, the Coal India Board had reached a consensus on supplying a minimum of 80% of the contracted quantity of the fuel to power firms, meeting 15% through imports.
As a result, the state run firm will import around 20 million tonne of coal this year.
Meanwhile, in the list of top-10 companies, RIL was at top position, followed by TCS, ONGC, CIL, ITC, HDFC Bank, NTPC, SBI, Infosys and Bharti.