Anthropic’s IPO filing goes public amid AI slowdown debate

Anthropic's long-anticipated IPO filing became public on Monday, setting the stage for what could become the largest technology listing in history, even as the company's chief executive urged the AI industry to pump the brakes on frontier model development.

The filing follows Anthropic's confidential submission of a draft S-1 registration statement to the Securities and Exchange Commission on June 1. Nvidia ↗ 0.57% is in talks to invest up to $10 billion as an anchor investor in the offering, according to Reuters, which reported that Anthropic is seeking to raise as much as $100 billion at a valuation of roughly $2 trillion.ibtimes+1

A Weekend of Warnings

The listing's public debut landed just days after Anthropic CEO Dario Amodei published a 3,800-word essay titled "We Must Pace the Frontier," in which he argued that AI's capacity for recursive self-improvement "could outrun our ability to understand and control these systems". Amodei proposed a three-part plan: embedding independent evaluators inside AI labs, coordinating safety standards among companies in democratic nations, and pursuing global regulatory cooperation.nytimes+3

The essay drew swift, rare alignment among rivals. OpenAI CEO Sam Altman reposted it on X, writing, "I agree with Dario that we need to pace the frontier," and pledged to embed third-party evaluators at OpenAI as well. Elon Musk, who leads SpaceX and Tesla ↘ 0.67%, endorsed the call with a brief post: "Dario is right".reuters+2

Altman separately told Fortune that an OpenAI IPO now would be "ill-advised," pushing a potential listing to at least 2027.investmentnews

Markets React

The convergence of safety rhetoric and blockbuster IPO preparations rattled investors on Monday. The S&P 500 and Nasdaq Composite both opened lower, with chipmakers bearing the brunt of the selling. Nvidia fell more than 3%, while Intel ↘ 0.05%, AMD Advanced Micro Devices, Inc. ↗ 2.19%, and Marvell Technology ↗ 1.32% dropped between 5% and 6%, according to Fortune. The Philadelphia Semiconductor Index ↗ 0.38% slid nearly 6%.fortune

The damage extended overseas. SoftBank plunged more than 10% in Tokyo, South Korea's Kospi fell 3%, and Taiwan Semiconductor Manufacturing Company ↘ 1.02% declined 1.2%.businessinsider+1

Safety or Strategy?

The overlapping timing has drawn skepticism. Short-seller Michael Burry has suggested the industry's caution may reflect a strategy to boost perceived value ahead of public offerings rather than a genuine reassessment of risk. Yet the commitments have been concrete: Anthropic said it would immediately grant third-party evaluators permanent, employee-level access to its systems.theatlantic+2

Whether the moment marks a lasting shift or a pause that recedes once the listings are complete remains the central tension for investors, regulators, and the AI industry itself.