The Bombay Stock Exchange benchmark Sensex fell by more than 40 points in early trade on Wednesday on fresh selling by funds and retail investors in line with weakening global markets.
The 30-share index, Sensex, which had gained 47.54 points in previous day's trading, lost 40.16 points at 14,090.79 after rising temporarily to 14,152.79 in first five minutes of trading.
Similarly, the wide-based National Stock Exchange fell by 30.70 points at 4,124.50.
Stock brokers said reports of weakening trends at global markets mainly dampened the trading sentiments.
Realty sector shares remained under selling pressure after Finance Minister P Chidambaram statement that the government was keen to curb demand in overheated sectors like real estate and housing.
Unitech Ltd, Parsvnath and few others in the realty sector stocks were placed lower.
Heavy-weight stocks like Reliance Industries, Reliance Communications, Infosys Technologies and Maruti were in negative zone.