The seven companies whose market valuation eroded in the week ended Friday (May 30) include RIL, ONGC, ITC, CIL, SBI, Infosys and ICICI Bank.
On the other hand, TCS, HDFC Bank and new entrant in the top 10 list Larsen & Toubro made gains.
The m-cap of ONGC dropped Rs 25,024.81 crore to Rs 3,23,611.41 crore, while RIL suffered a loss of Rs 20,266.28 crore to Rs 3,44,284.41 crore.
CIL's market valuation plunged Rs 16,675.21 crore to Rs 2,34,431.86 crore, while that of SBI tumbled Rs 15,928.14 crore to Rs 1,89,771.41 crore.
The m-cap of Infosys tanked Rs 7,177.95 crore to Rs 1,68,911.57 crore, while ICICI Bank shed Rs 4,862.84 crore to Rs 1,63,927.06 crore.
ITC's market-cap fell by Rs 516.95 crore to Rs 2,71,601.20 crore.
In contrast, TCS added Rs 3,290.66 crore to Rs 4,19,990.45 crore in its valuation.
Similarly, L&T's value rose by Rs 3,534.38 crore to Rs 1,43,646.38 crore and that of HDFC Bank jumped Rs 1,426.14 crore to Rs 1,90,987.90 crore.
In the ranking of top-10 firms, TCS was at number one position, followed by RIL, ONGC, ITC, CIL, HDFC Bank, SBI, Infosys, ICICI Bank and L&T.
On a weekly basis, the Sensex fell 476 points to 24,217.34.