The market may remain volatile this week ahead of the expiry of the futures & options October contract on coming Thursday, experts said.
The BSE 30-share index Sensex resumed slightly higher at 20,593.49 and hovered in a range of 20,606.68 and 20,531.28 before quoting at 20,545.83 (1030 hours).
It showed a loss of 24.45 points or 0.12 per cent from its last close.
The NSE 50-share barometer Nifty also moved down by 14.10 points or 0.23 per cent to 6,087.00 at 1030 hours.
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However, car major Maruti Suzuki India jumped by 5.55 per cent on strong Q2 result.
Asian stocks were trading lower ahead of the Federal Reserve's two-day meeting.
Key benchmark indices in China, Taiwan, Hong Kong, Singapore, Japan, Indonesia and South Korea shed 0.1 to 1.07 per cent.
Meanwhile, foreign institutional investors (FIIs) bought shares worth a net Rs 636.78 crore yesterday, as per provisional data from the stock exchanges.