The Nifty IT Index consists of 10 leading Indian IT companies listed on the National Stock Exchange (NSE). The constituents and their approximate index weightings are as follows: Company Name Index Weight (Approx.) Infosys Ltd. 37.56% Tata Consultancy Services Ltd. (TCS) 23.06% HCL Technologies Ltd. 12.00% Tech Mahindra Ltd. 6.94% Wipro Ltd. 5.57%