The Indian equity benchmarks extended gains on Thursday ahead of weekly expiry of index futures and option contracts led by gains in Reliance Industries, which touched new record high of Rs 2,768 on the BSE. HDFC Bank, Infosys, ICICI Bank, Tata Consultancy Services and Bajaj Finance were also among the leading movers in the Sensex amid strong global cues. The Sensex rose as much as 764 points and Nifty 50 index reclaimed its important psychological level of 17,300.