However, Bharti Airtel bucked the trend and saw its market valuation surge.
During the week, Bharti added Rs 816 crore to its market capitalisation, which stood at Rs 1,51,008 crore as of November 18.
Nevertheless, RIL retained the numero-uno status in the top-10, while ONGC held on to the title of the country's second-most valuable company.
TCS emerged as the third-most valued company, while CIL was at the fourth place, followed by Infosys, ITC, Bharti, NTPC, SBI and HDFC Bank.
RIL, saw the maximum erosion in investor wealth during the past week. The company witnessed a Rs 24,819 crore decline in market cap to Rs 2,64,583 crore, while state-owned ONGC's m-cap dropped by Rs 5,603 crore to Rs 2,21,801 crore.
IT bellwethers TCS and Infosys together shed Rs 10,440 crore in combined market capitalisation. As on Friday, the market cap of TCS stood at Rs 2,12,955 crore, while that of Infosys was Rs 1,57,302 crore.
Coal India Ltd's market worth declined by Rs 17,685 crore to Rs 1,88,417 crore, ITC saw its m-cap dip by Rs 8,322 crore to Rs 1,57,227 crore and power utility NTPC's market valuation slipped by Rs 8,987 crore to Rs 1,34,236 crore.
Last week, SBI's m-cap skidded by Rs 4,581 crore to Rs 1,09,569 crore and HDFC Bank lost Rs 1,461 crore in market value to Rs 1,06,992 crore.
The BSE benchmark Sensex has lost 4.7 per cent in the past week.
