AI stocks bounce back: Micron jumps 12%, Nvidia up 2%

On July 21, 2026, Micron stock surged 12.2% and Nvidia rose 2% to $91.01, per AP — bouncing back the day after an AI stock rout dropped the Dow 406 points. Because few traders were active and many owned the same stocks, prices swung hard both ways. That volatility hits retirement accounts heavy in big tech companies.