While shares of Punjab National Bank surged 6.03 per cent, Indusind Bank gained 4.63 per cent on the BSE.
Among others, Kotak Mahindra Bank rose by 4.20 per cent, Bank of India by 3.15 per cent, AXIS Bank by 2.88 per cent and Yes Bank by 2.67 per cent.
Similarly, SBI was up 2.50 per cent, HDFC Bank gained 1.68 per cent and ICICI Bank rose by 1.65 per cent.
Led by gains in these stocks, the BSE bankex index settled the day 2.58 per cent higher at 21,687 and was the biggest gainer among the 12 sectoral indices.
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"Markets rallied on this news as the rating upgrade would help foreign institutional investors be more comfortable investing long term in Indian markets and this move is expected to attract more capital," said Rakesh Goyal, Senior Vice President, Bonanza Portfolio Ltd.
Sharing similar views Jayant Manglik, President-retail distribution, Religare Securities Ltd said after the recent under-performance, banking sector finally witnessed strong rebound today and ended on strong note.
"We believe this move will extend further in the coming sessions and it would further fuel the prevailing recovery in the benchmark index," Manglik said.
Upgrading the outlook from 'stable' to 'positive', the global rating agency said that India has grown faster than many other peers over the last decade and the actions of the policymakers should further boost the country's economic and financial strength in coming years.
In the broader market, the benchmark Sensex ended at 28,885.21, up 177.46 points.