Mumbai - The benchmark BSE Sensex climbed over 600 points and the NSE Nifty regained the 8,400-mark in opening trade on Thursday as rate-sensitive stocks led rally after the RBI in a surprise move cut repo rate by 0.25 percent.

The 30-share index, which shed 238.45 points in the previous two sessions, rebounded by 600.77 points, or 2.19 percent, to trade at 27,947.59.

All the sectoral indices, led by banking and realty were trading in the positive terrain with gains up to 3.01 percent.

On similar lines, the National Stock Exchange index Nifty regained the psychological 8,400-mark by surging 176.05 points, or 2.12 percent to, 8,453.60.

Brokers said sentiments buoyed largely on the back of the RBI's surprise move to cut repo rate by 25 basis points to 7.75 percent, triggering all-round buying, particularly in interest-sensitive stocks.

Besides, encouraging quarterly earnings by some blue-chip companies and a better trend at other Asian bourses boosted sentiments. PTI