IT giant TCS has surpassed Mukesh Ambani-led Reliance Industries Ltd (RIL) to become the country's most valued company as its market capitalization climbed above Rs 2.61 lakh crore today because of spurt in the share price, said the media reports. Market capitalization of a listed company corresponds to the cumulative market price of all its shares. During the afternoon session trade, TCS commanded a market value of Rs 2,61,357 crore, the highest for any listed company in the country. This is about Rs 833 crore more than RIL's market value of Rs 2,60,524 crore, the report added. A gain of nearly 2 per cent at Rs 1,335 in TCS's share price pushed the company to the top slot. In comparison, RIL was trading 0.12 per cent lower at Rs 804 on the BSE.