Micron Slips 5.9% as AI Spending Doubts, Chinese Rivalry and a German Court Order Converge

Micron Technology closed Friday's session at 781.80 euros, down 5.9%, as a sector-wide retreat in semiconductor stocks dragged the memory chipmaker into its most bruising week of the year. Across five trading days the shares shed 15%, a slide that market watchers attribute less to anything Micron did than to a broader reappraisal of what the artificial-intelligence buildout is actually worth.

The trigger was a wave of investor skepticism over the durability of AI infrastructure spending and the debt-heavy financing behind it. Reports on the borrowing load carried by cloud provider CoreWeave sharpened those worries, according to AP and Reuters, and the anxiety rippled straight through the chip sector. AMD, Broadcom and Intel all fell alongside Micron on Friday.

A Sector Priced for Perfection

The vulnerability runs deeper than any single earnings report. According to Axios, Micron, Nvidia and Broadcom together were expected to account for nearly 40% of S&P 500 earnings growth in the third quarter. That kind of concentration leaves little room for doubt about whether the big cloud and data-center operators can keep spending at their current pace.

For months, the promise of limitless computing capacity pushed chip valuations to record highs. The mood has shifted. Investors now want to know when the technology's financial returns will arrive — and whether the borrowing that funds it can hold up in the meantime.

Competition From China Adds Pressure

Even before Friday's selloff, sentiment in the memory segment had been dented by reports of advancing Chinese competition. ChangXin Memory Technologies (CXMT) is pushing ahead on a denser 4F² DRAM cell design, and its president, Cao Kanyu, said the company aims to bring a server DDR5-RDIMM built on that architecture to market by the end of the year. The announcement stoked fears that established memory producers will face intensifying pressure to defend their technological lead.

German Court Sides With YMTC

Legal trouble is compounding the macro worries. On October 6, a German court issued written injunctions in Micron's dispute with Yangtze Memory Technologies Company (YMTC). The rulings require Micron to halt certain activities in Germany connected to contested 3D NAND products and to surrender goods located there, subject to stated exceptions. Micron has appealed the decision covering two utility models. The case is a reminder that the global chip battle is now fought in courtrooms as much as on production lines.

Labor Tensions in Taiwan

Micron also faces friction on the labor front in Asia. Reuters reported that Taiwan's President Lai urged both Micron's management and employee representatives on Thursday to negotiate in good faith and avert a threatened strike. The dispute centers on bonus payments at the company's Taoyuan production site. The local union has already voted in favor of strike action but has not yet set a date.

Buyback Signals Confidence — With Strings

Against the near-term noise, Micron's board moved to back its own outlook. On October 8 it raised the total share repurchase authorization to $35.16 billion. Buybacks under that approval may begin on December 9, 2026, subject to restrictions tied to CHIPS Act funding conditions. The size of the program underscores management's confidence in future earnings, though it also binds the company to regulatory guardrails.

Separately, mandatory filings with the U.S. Securities and Exchange Commission dated October 13 disclosed a series of transactions by executives and board members, including CEO Sanjay Mehrotra. The Form 4 submissions cover stock awards, the vesting of contractual claims and tax-withholding transactions. Micron also published the risk factors section of its annual report on Form 10-K for the fourth quarter of fiscal 2026.

What the Selloff Reveals

As long as the major technology companies keep expanding their data centers, underlying demand for high-speed memory remains intact. What has changed is the scrutiny applied to valuation premiums — and this week demonstrated how quickly any crack in the AI narrative transmits to memory chip prices. For investors, the question is no longer whether the buildout is real, but whether the market's expectations have run ahead of what the spending can support.