Indian IT stocks including TCS, Infosys, and Wipro are entering the March quarter (Q4 FY26) earnings season under significant pressure, with the Nifty IT index declining nearly 20-23% so far in 2026 amid weak global demand, subdued client spending, and concerns over artificial intelligence disrupting traditional revenue models. டிசிஎஸ், இன்போசிஸ், விப்ரோ உள்ளிட்ட இந்திய ஐடி பங்குகள் 2026-ல் 20 சதவ