The combined market valuation of eight of the top 10 valued firms eroded by ₹2.07 lakh crore last week. Tata Consultancy Services (TCS) and Bharti Airtel were the worst hit, with TCS' market valuation falling by ₹56,279.35 crore to ₹11,81,450.30 crore and Bharti Airtel's valuation declining by ₹54,483.62 crore to ₹10,95,887.62 crore. BSE Sensex had dropped 932.42 points last week.