The stock market opened on a weak note on Thursday with the benchmark Sensex declining by over 66 points following sustained selling by funds and retail investors.
The BSE-30 share index, Sensex, which lost over 310 points in the last three sessions, was down by another 66.57 points at 13,698.89 in the first five minutes of trading.
Similarly, on the wide-based National Stock Exchange, Nifty was down by 16.90 points at 4,060.10.
Stock brokers said sustained selling by foreign funds and domestic participants mainly dampened the trading sentiments.
They said overnight weakness in Indian company's ADRs at the US markets also impacted sentiments.
Major losers were Reliance Industries, Reliance Capital, Hindustan Lever, ITC Ltd, Ranbaxy Lab and Sterlite Industries on selling pressure.
Meanwhile, stocks of Fortis Healthcare were listed at Rs 106 on the bourses against the offered price of Rs 108.