Led by software major TCS, six out of top 10 Sensex companies lost a total Rs 62,808 crore in market valuation last week as sharp correction in Chinese stocks and worries over Greece debt crisis kept domestic markets on the edge. RIL, ONGC, ITC, Infosys and HDFC were among the losers last week, while HDFC Bank, CIL, Sun Pharmaceutical and SBI made gains in market valuations. Among the top 10 Sensex companies, the market valuation of TCS plunged the most by Rs 26,031.49 crore to Rs 4,84,177.97 crore last week. The m-cap of ONGC dipped Rs 13,303.78 crore to Rs 2,51,403.08 crore, while that of Infosys tanked Rs 12,162.32 crore to Rs 2,15,223.72 crore. The valuation of HDFC tumbled by Rs 5,178.8 crore to Rs 2,02,233.89 crore and that of ITC fell by Rs 4,448.61 crore to Rs 2,48,441.03 crore. RIL's market cap went down by Rs 1,682.95 crore to Rs 3,24,145.46 crore. In contrast, Sun Pharma added Rs 7,315.35 crore to Rs 2,16,909.61 crore in m-cap. HDFC Bank's valuation jumped Rs 4,520.62 crore to Rs 2,74,364.25 crore and that of CIL rose by Rs 1,579.09 crore to Rs 2,65,066.23 crore. The m-cap of SBI jumped Rs 1,248.42 crore to Rs 2,04,665.92 crore. In the ranking of top-10 firms, TCS stood at number one position followed by RIL, HDFC Bank, CIL, ONGC, ITC, Sun Pharma, Infosys, SBI and HDFC. In the broader market, the BSE benchmark Sensex fell by 431.39 points to end at 27,661.40. A sharp downward correction in Chinese stocks and uncertainties involving Greece kept Indian markets on edge, which ended last week in the red. The key indices of Sensex and Nifty settled below the psychologically significant 28,000 and 8,400 levels respectively, reversing three weeks of gains.