The market capitalisation (m-cap) of seven of the country's top-10 firms diminished by Rs 49,445 crore during the past week, with state-run Coal India and corporate major Reliance Industries losing the most.
The coal behemoth sufferred a loss of Rs 12,253.74 crore from its market valuation which stood at Rs 1,97,417.83 crore as on Friday.
CIL's scrip plunged 5.84 per cent last week and had closed at Rs 312.55 on the Bombay Stock Exchange.
The country's most valued firm Reliance Industries (RIL) saw its valuations erode by Rs 11,224.26 crore to Rs 3,14,982.94 crore.
Similarly, another energy major ONGC shed Rs 6,256 crore from its m-cap which was Rs 2,64,385.72 crore.
Besides, two of the top IT firms -- TCS and Infosys Technologies-- together added Rs 9,606.57 crore to their combined valuation. The m-cap of TCS was Rs 2,04,625.26 crore, while that of Infosys was Rs 1,74,539.73 crore.
The country's top lenders-- SBI and ICICI Bank-- together shed Rs 11,182.15 crore from their cumulative market valuations. The m-cap of SBI and ICICI stood at Rs 1,81,534.12 crore and Rs 1,29,172.15 crore, respectively.
The valuation of power major NTPC also went down by Rs 6,225.32 crore to Rs 1,45,738.51 crore.
FMCG giant ITC's valuation also declined by Rs 2,303.93 crore to Rs 1,29,103.64 crore.
Telecom major Bharti Airtel, however, bucked the trend and added Rs 1,784.83 crore to its valuation which stood at Rs 1,26,666.28 crore.
The exclusive list of top-10 companies is decided as per the market valuations of each firm.
Meanwhile, the stock market during this period fell 2.29 per cent to settle at 19,136.61 at the end of Friday's trade on the Bombay Stock Exchange.