Amodei's AI slowdown call sinks Micron 6%, SK Hynix 7%

The selloff traces back to a specific catalyst: weekend essays from Anthropic CEO Dario Amodei and OpenAI CEO Sam Altman calling for a deliberate slowdown in AI capability advancement. Amodei's essay stated, "We must slow the pace at which we improve the capabilities of AI models," and Altman agreed, while clarifying that pacing does "not mean 'stopping.'" Neither company has signaled a change to capital plans or model-training budgets.

The reaction concentrated in memory because that group carries the richest AI-infrastructure expectations. Micron stock is up 221% year to date, a gain that left holders with significant profit to protect on any threat to the AI-memory thesis. The symmetry of the declines — Micron and SanDisk falling by nearly the same amount despite very different businesses — suggests theme-level selling rather than company-specific concerns. SK Hynix, the primary HBM supplier for NVIDIA AI accelerators, saw the deepest drop at 7%.

As Bernstein analyst Madison Rezaei framed it, "At this point, it's not a call for a lowering of capex or stopping model training. However, many investors have started to question what happens if training slows." The essays change sentiment immediately but change hyperscaler orders only if anyone acts on them. The bull case rests on the fact that no hyperscaler has cut capital spending, positioning the essays as a safety framework rather than a spending signal. The coming days will reveal whether that holds.