AI stocks snap back: Micron soars 12.2%, Nvidia adds 2% in sharp reversal

On July 21, 2026, Micron Technology shares jumped 12.2% and Nvidia rose 2% to $91.01 in an AI-led Wall Street rally, per AP. The rebound came one session after a global AI sell-off dropped the Dow 406 points. Thin liquidity and crowded positioning are amplifying two-way volatility across the AI cohort, hitting retirement balances concentrated in megacap tech.