Benchmark equity indices rebounded from early lows and settled at new record high levels in a volatile session on Wednesday following buying in private bank and select IT shares. The BSE Sensex jumped 408.86 points or 0.55 per cent to settle at a new record high of 74,085.99. The NSE Nifty50 climbed 117.75 points or 0.53 per cent to settle at a lifetime high of 22,474.05. Positive up-move was supported by buying in Banking, IT, Healthcare, and Auto.