Across-the-board selling on the last day of May series derivatives contracts, growing concerns over muted corporate earnings so far and mixed global cues pulled down markets, brokers said.
Participants were seen offloading their long positions in Futures and Options (F&O) segment instead of carrying them forward to the next series for June month, they said.
"The F&O expiry and other negative factors including disappointing Q4 earnings by more bluechip companies have been hurting market sentiments," said a Delhi-based stock broker.
The BSE 30-share barometer opened on a firm note and advanced to the day's high of 27,666.37 following covering-up of short positions and value-buying in bluechip stocks.
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However, offloading of positions by participants in view of May month expiry pulled it into negative zone to touch a low of 27,354.35. The Sensex finally settled down 57.95 points, or 0.21 per cent at 27,506.71. The gauge had gained 33.25 points in yesterday's volatile session.
In Asia, markets finished mostly mixed, while Eruopean markets were down in early trade amid Greek financial woes.