The combined market valuation of all the top-10 most valued firms plunged Rs 4,95,061 crore last week, in line with a bearish trend in equities, where Tata Consultancy Services and Reliance Industries faced the sharpest erosion. Last week, the BSE benchmark tanked 4,091.53 points or 4.98 per cent. The combined market valuation of all the top-10 most valued firms plunged Rs 4,95,061 crore last week, in line with a bearish trend in equities, where Tata Consultancy Services and Reliance Industries faced the sharpest erosion. Last week, the BSE benchmark tanked 4,091.53 points or 4.98 per cent. Economic Times