Micron Technology (MU) Stock After Hours Today (Dec. 22, 2025): What’s Driving the Move and What to Watch Before Tuesday’s Open
Micron Technology, Inc. (NASDAQ: MU) is ending Monday, December 22, 2025, on a strong note as the market heads into a holiday-shortened week. Shares closed up about 4% and ticked slightly higher in after-hours trading—keeping the memory-chip maker near its 52-week high as investors digest a fast-moving mix of AI-driven demand, tightening supply conditions, and a fresh wave of bullish analyst commentary. MU stock after the bell: the quick snapshot As of the latest post-close update: Micron’s move keeps it pressing the top of its recent range, with the stock’s 52-week high around $277.29. MarketWatch Why Micron is moving: the