Anthropic CEO's Safety Warning Triggers AI Stock Selloff

AI stocks tumble on capability concerns

AI-related stocks experienced significant premarket losses Monday following a lengthy essay from Anthropic CEO Dario Amodei that urged the industry to slow the pace of AI capability advancement to allow safety measures to keep pace.

The selloff hit semiconductor and AI infrastructure companies hardest. Marvell and SK Hynix each dropped 7% before the opening bell, while CoreWeave, SanDisk, Intel, and AMD fell 6%. Micron and Super Micro Computer declined 5%. Even industry leaders Nvidia and Broadcom slid 3%, according to Yahoo Finance, which first reported the market reaction.

The catalyst: a call for prudence

In a 3,800-word essay published Saturday, Amodei argued that addressing AI risks requires "even more prudence — not just investing in risk prevention, but pacing the rate of capabilities advancement so that risk prevention has time to keep up." He explicitly called for slowing the pace of AI model improvement, though he noted progress would still appear rapid.

OpenAI CEO Sam Altman quickly endorsed Amodei's position, then elaborated on the risks in an early Monday post on X. Altman outlined two primary threats: losing control of the future to AI systems, and excessive concentration of power in the hands of one entity — whether a person, company, or country.

"If an extraordinarily powerful AI is used by one person or company to impress their worldview onto everyone else, the results could be extremely dystopian," Altman wrote around 12:57 a.m. ET.

Why it matters

The coordinated messaging from two leading AI lab CEOs represents a notable shift in public positioning. While both executives have previously discussed AI safety, the timing and severity of their warnings — combined with explicit calls to slow capability development — signal growing internal concern about the pace of progress. For investors, the statements introduce uncertainty about deployment timelines and competitive dynamics in an industry that has traded on expectations of rapid advancement. The market reaction suggests investors are recalibrating assumptions about near-term AI infrastructure demand.

Industry interprets the framework

Bernstein analyst Madison Rezaei characterized the framework as centered on minimizing security risks through independent review, coordinated safety standards, and international cooperation.

The sharp market response underscores how sensitive AI valuations have become to signals about development pace and regulatory constraints. The selloff affected the entire value chain, from chip designers to data center infrastructure providers, indicating investors view the safety concerns as potentially affecting the broader AI buildout.

Yahoo Finance first reported the market moves and executive statements.