In a volatile session past week, six out of the top-10 firms lost nearly

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Rs 36,000 crore from their market capitalisation, with private telecom major Bharti Airtel losing the major pie from its valuation.

Besides, four companies who buck the falling trend are --ONGC, TCS, Infosys and BHEL -- which added Rs 6,295.94 crore to their market capitalisation for the week ended February 20.

Bharti Airtel, which slipped to the 10th spot from the previous week's ninth position saw its valuation plunging by Rs 13,717.66 crore, taking its total market cap to Rs 1,05,658.76 crore. The company is in race to acquire South Africa-based Zain Telecom for USD 9 billion.

Shares of Bharti Airtel lost 11.49 per cent to close at Rs 278.25 on the Bombay Stock Exchange at the end of Friday's trade.

During the week the 30-share index Sensex gained 39 points or 0.24 per cent to close at 16,191.63 points on BSE.

Mukesh Ambani-led Reliance Industries maintained its numero-uno position in the list even after losing Rs 9,712.52 crore from its valuation, taking its total m-cap to Rs 3,21,870.42 crore.