Power major NTPC witnessed a wealth erosion of Rs 8,946.33 crore from its kitty, thus narrowing its m-cap to Rs 1,67,753.88 crore during the last week. The company emerged as the top loser in the list of top-10 companies by their m- cap.

Shares of NTPC fell over four per cent, during the week, to close at Rs 203.45 as on Friday's trade on the Bombay Stock Exchange (BSE). Corporate behemoth Reliance Industries (RIL), yet again ruled the chart, even though it lost Rs 2,405 crore from its m-cap which stood at Rs 3,40,599.13 crore.

Oil and gas major ONGC also shed Rs 4,438.16 crore from its market valuation, which was at Rs 2,86,908 crore. Two of the country's top lenders, State Bank of India and ICICI Bank, together lost Rs 5,136.39 crore from their combined market valuation. The m-cap of SBI stood at Rs 2,00,955.29 crore, while that of ICICI was at Rs 1,29,335.83 crore as on Friday past week.

Bucking the trend, IT giant Tata Consultancy Services emerged as one of the gainers, adding Rs 1,849.55 crore to its valuation which stood at Rs 1,86,129.72 crore. Meanwhile, another IT bellwether Infosys saw its m-cap dropping by Rs 71.76 crore to Rs 1,76,583.31 crore and likewise, trading major MMTC also lost Rs 1,730 crore from its market valuation, which stood at Rs 1,32,520 crore.

The other gainer in the list was FMCG honcho ITC, which witnessed a mild addition of Rs 38.38 crore to take its m-cap to Rs 1,32,128 crore. Top telecom player Bharti Airtel also saw its valuation diminishing by Rs 6,493.76 crore to Rs 1,26,932.11 crore.

During the week ended Friday, the BSE index Sensex fell by 1.82 per cent to settle at 20,125.05.