The Indian equity benchmarks extended gains in late morning deals on Wednesday led by gains in index heavyweights like Reliance Industries, ICICI Bank, Infosys, HDFC, Kotak Mahindra Bank, Bajaj Finserv and Bajaj Finance. The Sensex rose as much as 547 points and Nifty 50 index reclaimed its important psychological level of 18,200. The benchmarks have been on a strong up move since start of this year on hopes of strong economic reforms in the upcoming Union Budget which will be presented on February 1, analysts said.