The Indian equity benchmarks extended gains in noon deals and were on track to end higher for fourth day in a row led by gains in banking and financial services shares like HDFC Bank, ICICI Bank, Kotak Mahindra Bankj, Bajaj Finserv and Axis Bank. The Sensex rose as much as 406 points and Nifty 50 index reclaimed its important psychological level of 17,900.