New Delhi: Five of top-10 most valued firms together added Rs 43,689.89 crore in market valuation last week, with ITC and Infosys contributing most to overall gain.Gainers from top-10 list are ITC, HDFC, Infosys, SBI and ICICI Bank; while Reliance Industries Ltd (RIL), TCS, HDFC Bank, HUL and Kotak Mahindra Bank suffered losses in their market capitalisation (m-cap) for week ended Friday.The m-cap of ITC soared Rs 17,941.73 crore to Rs 3,61,773.90 crore and that of Infosys jumped Rs 10,026.05 crore to Rs 2,98,684.46 crore.ICICI Bank's valuation zoomed Rs 8,378.07 crore to Rs 2,43,822.14 crore and that of SBI jumped Rs 4,506.92 crore to Rs 2,70,013.40 crore.The m-cap of HDFC moved up by Rs 2,837.12 crore to Rs 3,41,770.70 crore.On other hand, valuation of Tata Consultancy Services (TCS) slumped Rs 12,007.63 crore to Rs 6,91,170.50 crore.Kotak Mahindra Bank's m-cap fell Rs 4,829.04 crore to Rs 2,32,958.82 crore and that of Hindustan Unilever Ltd (HUL) dropped Rs 2,575.93 crore to Rs 3,82,785.70 crore.HDFC Bank's valuation dipped Rs 1,522.93 crore to Rs 5,74,399.48 crore and that of RIL fell Rs 728.93 crore to Rs 6,95,910.71 crore.In ranking of top-10 firms, RIL once again became number one firm on Friday, with TCS taking second spot, followed by HDFC Bank, HUL, ITC, HDFC, Infosys, SBI, ICICI Bank and Kotak Mahindra Bank.Over last week, Sensex gained 314.74 points to close at 36,009.84 on Friday.