The Bombay Stock Exchange benchmark, Sensex, fell by nearly 79 points on Tuesday morning trading on profit-selling by funds and retail investors in bluechip stocks.
The 30-share sensitive index, which gained about 63 points on Monday, was down by 78.90 points at 10,664.98 in the first five minutes of trading.
Similarly, the Nifty index on the National Stock Exchange was down by 24.80 points at 3,118.40.
Stockbrokers said the fall in select stock prices was mostly attributed to profit-taking by retail investors at higher levels.
The major losers were Larsen and Toubro, Grasim Industries, Maruti, SBI, Tata Motors, HDFC Bank, Dr Reddy's Lab, ONGC, Infosys Technologies, TCS, Satyam Computers, Wipro, Reliance Communication, ICICI Bank and HDFC Ltd.
However, Reliance Industries, BHEL and Ranbaxy Lab were in the positive zone on some buying by funds.