Benchmark indices Sensex and Nifty raced to fresh record highs on Wednesday as gains in financials, auto and IT shares helped markets extend their winning run for the sixth straight session. After a volatile session, the 30-share BSE Sensex closed up by 133.14 points or 0.28 per cent at a record high of 47,746.22. The barometer scaled its all-time intra-day high of 47,807.85. The broad-based NSE Nifty rose by 49.35 points or 0.35 per cent to finish at its lifetime high of 13,981.95. It touched all-time peak of 13,997 in intra-day trade.