Dragged down by TCS and Infosys, the combined market capitalisation (m-cap) of top-six blue-chip companies slumped by Rs 41,307 crore last week.
While TCS, RIL, ITC, ONGC, Infosys and Wipro saw erosion in their market valuation, CIL, HDFC Bank, Bharti Airtel and HUL made gains.
Market capitalisation of TCS tanked Rs 18,187 crore to Rs 4,19,823 crore, becoming the top loser among the 10 most valued firms on the BSE.
Infosys' value slumped Rs 7,623 crore to Rs 2,04,812 crore, while RIL lost Rs 5,348 crore to Rs 2,63,154 crore from its market capitalisation.
The value of ONGC plummeted by Rs 5,347 crore to Rs 2,30,356 crore and Wipro's m-cap slipped Rs 3,452 crore to Rs 1,38,311 crore.
Similarly, the market value of ITC declined by Rs 1,350 crore to Rs 2,56,785 crore.
In contrast, state-run Coal India added Rs 13,864 cror e to Rs 1,70,194 crore in its m-cap, while HDFC Bank's value soared by Rs 4,553 crore to Rs 1,55,257 crore.
HUL's m-cap surged Rs 1,579 crore to Rs 1,24,924 crore and that of Bharti Airtel rose by Rs 139 crore to Rs 1,26,117 crore.
TCS continued to remain at the top in the domestic market cap chart, followed by RIL, ITC, ONGC, Infosys, CIL, HDFC Bank, Wipro, Bharti and HUL.
The BSE 30-stock benchmark index, Sensex, lost 137.29 points to close the week at 20,376.56 on Friday.