Semiconductor stocks slide after Anthropic CEO calls for AI development slowdown

When the CEO of one of the world’s leading AI labs tells the industry to pump the brakes, the stock market listens. And investors in semiconductor companies clearly did not like what they heard. Anthropic CEO Dario Amodei published an essay titled “We Must Pace the Frontier” calling for a deliberate slowdown in frontier AI development. His argument: AI capabilities are advancing faster than the safety measures designed to keep them in check. The semiconductor sector, which has effectively become a proxy bet on AI’s growth trajectory, took an immediate hit. The damage across chipmakers Intel and AMD both fell over 4% in the sessions following Amodei’s essay. Memory chipmakers fared similarly, with Micron and SanDisk dropping in the range of 3.9% to 4.5%. The iShares Semiconductor ETF (SOXX), a broad benchmark for the sector, declined roughly 2.8%. Earlier in 2026, semiconductor stocks had already shed over $1 trillion in market value as investors grew increasingly nervous about the sustainability of massive capital expenditure on AI infrastructure. Amodei’s essay landed on soil that was already pretty soft. What Amodei actually proposed The essay wasn’t a vague plea for caution. Amo...