The combined market valuation of nine of the top-10 most valued firms surged Rs 2,29,589.86 crore last week, with Life Insurance Corporation of India emerging as the biggest gainer, in tandem with a rally in benchmark indices. Last week, BSE benchmark Sensex jumped 685.68 points or 0.86 per cent and NSE Nifty climbed 223.85 points or 0.93 per cent.