Stock Market Today, July 21: Micron Surges 12% as Semiconductor Strength Lifts Nasdaq
Major stock indices gained on July 21, 2026, with the Nasdaq rising 1.29%, S&P 500 up 0.89%, and Dow Jones adding 0.74%. Semiconductor stocks led the rally, with Micron surging 12% and SanDisk soaring 14%. AMD gained 8% following its AI deal with Microsoft, while General Motors and AeroVironment also posted gains. The rally occurred despite geopolitical tensions and tariff concerns, with strong AI demand from South Korea supporting chip stocks.
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