Micron surges 20% in biggest single-day gain since 2011,…

Micron Technology ($MU) posted a 20% single-day gain — its largest since 2011 — pushing the chipmaker's market capitalization past the $1 trillion mark. The move signals a sharp shift in investor sentiment around memory and storage semiconductors, a sector that had been under pressure through much of the past year.

The surge reflects renewed confidence in Micron's positioning within the AI-driven hardware buildout, where demand for high-bandwidth memory (HBM) and DRAM has accelerated faster than most forecasts anticipated. Crossing the $1 trillion threshold puts Micron in rare company among US technology firms and underscores how quickly the AI infrastructure trade is repricing legacy chip names.