AI infrastructure stocks fall as midterm results threaten data-center build-out

AI infrastructure stocks sold off on Wednesday 4 November, the first trading session after the US midterm results. CoreWeave fell about 10%, Micron fell 7% and Nvidia fell 3.17%, according to CNBC's report on the midterms and AI data centres. Microsoft and Amazon each rose more than 6%. The move reflects a bet that the next phase of AI capacity will be slower and harder to build.

Investors reacted to the Democratic sweep and to concern about a slower data-center build-out and tougher regulation. The clearest example is Texas, where incoming Democratic governor Gina Hinojosa has proposed a statewide moratorium on new data-center permits. Projects already under construction would reportedly be exempt. Nomura said projects planned for 2028 face more exposure to permitting delays than those already under construction.

The strain predates the election. CoreWeave, Nebius and Iren each lost at least 30% in October. CNBC's live coverage of the 4 November session reported the Nasdaq in correction territory. Index declines were reported differently by other outlets, so this article does not rely on those figures.

James Sullivan, JPMorgan managing director and co-head of global fundamental research, put the logic plainly to CNBC: "existing capacity is significantly more valuable now because of incremental supply constraints."

The logic favours operators that already hold capacity. If permits for new sites tighten, power-ready and already-built facilities become scarcer, which supports their value. Microsoft and Amazon, which rose on the day, sit on large existing footprints, but the notes do not say why their shares moved, so that link is our reading rather than a confirmed cause.

The exposed group is anyone whose growth depends on new sites, particularly projects scheduled for 2028 and neocloud providers that have already lost ground this year. The key items to watch are whether the Texas proposal advances, whether the exemption for projects under construction holds, and whether permitting delays show up in the build schedules these companies report.