IT stocks led the market on Monday, with the Nifty IT index surging nearly 4 percent as Tata Consultancy Services (TCS) rallied on a major deal win with ABB and LTM Ltd gained after announcing a strategic partnership with Anthropic to accelerate enterprise adoption of Claude artificial intelligence models. Optimism around the June-quarter earnings season, with HCL Technologies set to report results later in the day, further supported sentiment. At around 1:49 pm, the Nifty IT index was up 3.77 percent, sharply outperforming the benchmark indices; the Sensex was flat, while the Nifty 50 was marginally lower. TCS led the rally, climbing more than 5 percent after announcing a multi-million-dollar, multi-year agreement with ABB to transform the engineering company's global network operations through an AI-driven network-as-a-service model. HCL Technologies gained nearly 5 percent ahead of its June-quarter earnings due later in the day, with investors watching for management commentary on AI demand and FY27 revenue guidance. According to a CNBC-TV18 poll, HCL Tech is expected to report sequential growth in both revenue and profit, with EBIT margin improving to 16.8 percent from 16.5 percent in the preceding quarter.