The wider 50-scrip Nifty of the National Stock Exchange (NSE) was also trading lower at 8,006.40 points, with a loss of 33.80 points or 0.42 percent.
The 30-share Sensex opened at 26,478.36 points, against the previous close at 26,552.92 points on Wednesday.
At 9.33 a.m., it was ruling at 26,455.39 points, with a loss of 97.53 points, or 0.37 percent.