HCL Tech's shares tumbled 8.78 per cent to Rs 1,510.60 on the BSE.
At the NSE, the stock plunged 8.74 per cent to Rs 1,511.
The company's scrip was the biggest loser among the 50-Nifty stocks.
The stock witnessed selling pressure, in line with other IT stocks, after the company missed estimates in earnings.
HCL Technologies today reported 32.3 per cent rise in consolidated net profit at Rs 1,873 crore for the first quarter ended September 30 on the back of strong growth in Europe and business services.
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Consolidated revenues grew 9.7 per cent at Rs 8,735 crore in the July-September quarter of this fiscal as against Rs 7,961 crore in the same quarter of the previous fiscal.
The firm follows July-June as the fiscal year.
In dollar terms, net profits rose by 36.1 per cent to USD 307.2 million in the first quarter of the current fiscal as against USD 225.6 million in the year-ago period.