US stocks today: S&P 500 hits record closing high on AI optimism, Micron joins $1 trillion club

May 26, 2026

US stocks closed mixed with Nasdaq and S&P 500 hitting record levels as AI-driven optimism lifted tech and chip stocks. Micron surged into the $1 trillion club after a strong price target hike. Geopolitical tension from US-Iran strikes pushed oil higher, while investors stayed focused on AI earnings momentum.

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