India, July 21 -- Shares of HDFC Bank tumbled over 5 per cent on Monday, dragging the benchmark indices lower, after the lender's quarterly earnings disappointed on the margin front. The blue-chip stock declined 5.12 per cent to settle at Rs 777.65 on the BSE. During the day, it tumbled 5.44 per cent to Rs 775.

On the NSE, the stock tanked 5.12 per cent to end at Rs 777.60. The company's market valuation eroded by Rs 64,685.58 crore to Rs 11,97,684.23 crore.

Heavy selling in HDFC Bank dragged down the equity markets. The 30-share BSE Sensex edged lower by 442.93 points, or 0.57 per cent, to settle at 77,708.52. The 50-share NSE Nifty declined 95.80 points, or 0.39 per cent, to end at 24,238.50.

The country's biggest private sector lend...