Micron gets hit by the AI-spending jitters

The AI party got a little quieter

Micron woke up Monday to a rough haircut, falling more than 5% in premarket trading as investors took a nervous look around the room and decided the AI spending buffet might not be as endless as everyone hoped. The sell-off wasn’t just a Micron thing either — Sandisk, Western Digital, Seagate, and SK hynix all got dragged lower in the same memory-and-storage downdraft.

What changed?

The immediate spark was a broader reassessment of AI infrastructure spending. The Financial Times reported that investors are worried calls to slow AI development could eventually translate into less capex — which is Wall Street shorthand for “less money flowing into chips, servers, and all the expensive plumbing that makes AI work.”

And when the market starts whispering about slower spending, the chip trade can get jumpy fast. Add in comments from Anthropic CEO Dario Amodei plus public support from OpenAI’s Sam Altman and SpaceX CEO Elon Musk for AI safety coordination, and suddenly traders are squinting at the growth story like it just texted them “we need to talk.”

Why investors should care

Micron is still sitting on a monster long-term rally, but Monday’s move is a reminder that momentum cuts both ways. The stock has been priced like a beneficiary of the AI buildout, so any sign that that buildout could slow — even indirectly — can hit the shares before the fundamentals actually change.

Micron also has earnings coming on September 30, which means this isn’t just a mood swing. Investors will be laser-focused on whether demand, pricing, and AI memory trends still justify the upbeat expectations.

Big picture: Micron’s business story is still strong, but the market is basically asking whether the AI megatrend is a runway or a ceiling. That’s the kind of question that can move a stock a lot faster than a spreadsheet can.