Benchmark stock indices Sensex and Nifty pared opening gains to trade lower in the early session on Friday amid sustained selling by foreign institutional investors.

The 30-share BSE Sensex opened higher at 82,335.94 and later hit a high of 82,516.27. However, profit-taking by investors dragged the barometer into the red. The index was down 22.13 points or 0.03 per cent at 82,285.24 at 1000 hrs.