The Nifty IT index dipped more than 2% on Thursday as a sell-off seen in the US' tech-heavy Nasdaq Composite index overnight dampened sentiment. Wipro was the top loser on the Nifty IT index after its tepid Q4 revenue and weak outlook crashed its shares 5%. LTIMindtree, HCLTech, Infosys and Tech Mahindra were also among the top losers.