After swinging 413 points during the session, the 30-share Sensex settled 53.73 points, or 0.13 per cent, lower at 40,248.23.
With no major events due this week, market will focus on the next leg of corporate result announcements, said Vinod Nair of Geojit.
The broader NSE Nifty too advanced 13.15 points, or 0.11 per cent, to close at 11,890.60.
Top gainers in the Sensex pack included IndusInd Bank, Hero Motocorp Tech Mahindra, Tata Steel, ITC and Infosys.
In terms of RCEP, I want to clarify that lots of wrong information are being spread, said Union Minister Piyush Goyal.
Inching closer to its all-time intraday high, Sensex was trading 0.55 per cent higher during early trade.
The broader NSE Nifty advanced 35.85 points, or 0.30 per cent, to 11,822.70.
Tata Motors was the top gainer in the Sensex pack, rallying over 13 per cent, after the company posted strong quarterly results.
RIL rose over 1 per cent Tata Steel, M&M, Vedanta, TCS and Maruti too advanced up to 3 per cent.
The 30-share Sensex swung over 523 points before settling 37.67 points, or 0.10 per cent, higher at 39,058.06.