The stock listed at Rs 666.60, down 6.11 per cent, as compared to the issue price on BSE. It was later trading with a loss of 2.23 per cent at Rs 694.15.
At NSE, the scrip debuted at Rs 667, reflecting a fall of 6 per cent.
The company at present commands a market valuation of Rs 11,799 crore.
Shares of Larsen & Toubro were trading 0.41 per cent lower at Rs 1,565 on BSE.
The firm's IPO which was oversubscribed nearly 12 times had attracted more than one million applications, the highest for any share sale offer in at least five years.
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L&T Infotech had fixed a price band of Rs 705-710 per share for the offering.
Kotak Mahindra Capital Company, Citigroup Global Markets India and ICICI Securities were the managers of the issue.
In the financial year 2015-16, L&T Infotech's revenue from operations and other income stood at Rs 6,143.02 crore, while it clocked a profit after tax of Rs 922.17 crore during the same period.
L&T Infotech is the sixth largest Indian IT services player at present with a revenue of USD 887 million and an employee base of over 20,000 people.