Infosys weighting in the BSE Sensex currently stands at 9.70 percent, only 15 basis points away from 9.85 percent for ITC, Thomson Reuters Data shows.
In the Nifty, Infosys' weighting stands at 8.41 percent compared with 8.58 percent for ITC.
Software exporter Infosys shares rose 16.4 percent in the last three months on rupee depreciation and hopes of higher business from the United States, while ITC Ltd
Infosys overtook Reliance Industries Ltd
Infosys shares were up 1.2 percent after earlier touching a record high of 3,557.60 rupees.