Micron Technology shares decline amid semiconductor selloff tied to weaker AI chip revenue guidance from Broadcom, raising questions about AI memory valuation.

Micron Technology (NasdaqGS:MU) shares experienced a sharp multi-day decline during a global semiconductor selloff. The stock last closed at US$864.01 after a period of strong gains, and remains up 15.7% over the past month despite the recent pullback.

Investors are scrutinizing Micron's valuation and recent insider selling activity. At US$864.01, the stock trades about 17% above the US$739.48 analyst price target midpoint and about 222% above estimated fair value according to Simply Wall St's assessment.

The selloff has shifted investor sentiment after months of enthusiasm around AI infrastructure demand. Micron remains a key HBM4 supplier to Nvidia and continues to face shortages in AI memory, but now faces closer scrutiny over how much future growth is already reflected in current pricing.