Market Nine of top 10 firms add Rs 82,379.79 crore in m-cap Updated : May 20, 2019 08:28 AM IST TCS was the only company to register a decline in its market valuation. HDFC Bank emerged as the top gainer, with its m-cap jumping Rs 17,685.54 crore to Rs 6,43,560.05 crore. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.