Investors revived the AI trade, sparking a tech rally driven by earnings, capital spending expectations, lower rate pressure, and renewed confidence that AI infrastructure demand has not peaked. The Nasdaq 100 rose about 1.3 percent in one key session tied to the AI rebound, while the S&P 500 gained roughly 0.7 percent; another trading day saw the Nasdaq 100 up around 1.5 percent and the S&P 500 higher by about 0.9 percent, with chip stocks and AI-linked megacaps leading. The rally began after dip buyers returned to the semiconductor sector following a pullback, betting on strong demand for AI training, inference, memory, networking, and cloud capacity. Nvidia reassured investors that its product road map was intact after reports of server delays, and Broadcom gained after extending its partnership with Apple. High-bandwidth memory (HBM) has become especially important; SK Hynix is a leading supplier of HBM used in AI servers, and its shares in South Korea have risen sharply this year.