The 30-share index pared all gains to trade 41.28 points, or 0.10 per cent, lower at 40,260.68.
Top gainers in the Sensex pack included Vedanta, Tata Steel, ICICI Bank, Tata Motors, SBI, HCL Tech, Sun Pharma.
After touching a fresh lifetime high of 40,392.22, the 30-share index settled 77.18 points, or 0.19 per cent, higher at 40,129.05.
After hitting a high of 40,178.12, the 30-share index ended 220.03 points, or 0.55 per cent, higher at 40,051.87.
Aramco was expected to launch the first part of a two-stage IPO earlier in October.
The 30-share Sensex soared over 666 points before settling 581.64 points, or 1.48 per cent, higher at 39,831.84.
After hitting a high of 39,241.61, the 30-share index was trading 137.92 points, or 0.35 per cent, higher at 39,158.31.
After gyrating over 486 points, the 30-share Sensex settled 38.44 points, or 0.10 per cent, lower at 39,020.39.
The 30-share index was trading at 197.24 points higher, or 0.50 per cent, to 39,256.07
The 30-share index was trading flat at 38,963.28, and the broader NSE Nifty slipped 3.40 points, or 0.02 per cent, to 11,584.95.