After gaining over 400 points in past three sessions, the Sensex today declined by 51.14 points, or 0.26 per cent, to close at 19,939.04. The gauge had hit the crucial 20,000-level many times during the day but failed to build momentum.
Profit-booking in recent gainers such as RIL, Sun Pharma, Jindal Steel, Maruti Suzuki and Sterlite Ind. Pulled 30-scrip Sensex down where 17 stocks fell. Tata Power remained flat.
Brokers said investors booked profits in some blue-chips that registered gains in last few sessions ahead of March IIP tomorrow and a weakening trend elsewhere in Asia and Europe.
"Also, in the one-sided rally seen in last four weeks, market participants become sceptical as to whether to buy at these high levels or not," said Nidhi Saraswat, Senior Research Analyst, Bonanza Portfolio.
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While healthcare, metal and realty stocks saw selling, IT sector was the best performer of the day after US-based Cognizant's maintained its annual revenue outlook, boosting investor sentiment. HCL Tech gained over 2.6 percent, followed by TCS (1.52 pc), Wipro (0.80 pc) and Infosys (0.40 pc).
In small-cap space, Viceroy Hotels zoomed 20 per cent after its board gave nod for selling Chennai Project Division for Rs 480 crore. IT training firm Aptech gained over 16 per cent on buyback buzz, said dealers.
Globally, Asian markets ended mixed. European indices were trading lower in late trades.