Stock Market Today, Feb. 25: Nasdaq Gains 1.3% As Nvidia Reignites AI Optimism

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Today, Feb. 25, 2026, Nvidia surges and AI enthusiasm steadies broader U.S. stock indexes. The S&P 500 ( ^GSPC +0.81%) rose 0.81% to 6,946.13 and the Nasdaq Composite ( ^IXIC +1.26%) climbed 1.26% to …