Indian stock benchmarks extended gains for the fourth session, with the BSE Sensex rising by 411.18 points to 84,363.37 (+0.49%) and Nifty50 up 133.30 points at 25,843.15 (+0.52%). Key gainers included Reliance Industries and Bajaj Finserv, while ICICI Bank and M&M saw losses. Nifty PSU Bank rose 2.87%.