On June 1, 2026, Anthropic filed a draft S-1 registration statement with the Securities and Exchange Commission (SEC), becoming the first major AI developer to officially initiate its IPO process. This move precedes the public listing timelines of its primary competitors, setting the stage for historic market debuts by Anthropic, SpaceX, and OpenAI, with a combined valuation approaching $4 trillion.

Shortly before the filing, in late May 2026, Anthropic closed a $65 billion Series H funding round at a $965 billion post-money valuation, led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital. Founded in 2021 by former OpenAI employees, including CEO Dario Amodei, the company develops the Claude language model and is reporting significant growth in corporate revenue. Concurrently, SpaceX submitted a public S-1 filing in May 2026, targeting a Nasdaq listing under the ticker SPCX around June 12 with an estimated $1.8 trillion valuation, while OpenAI aims for a roughly $1 trillion valuation in the second half of 2026.

The aggregate market capitalization of these three tech giants at the time of their respective IPOs is projected to range between $3.7 trillion and $4 trillion, a figure comparable to the GDP of the world's largest economies. Final IPO parameters for Anthropic, including share volume and pricing, will be determined later based on market conditions. Nevertheless, the event is already positioned as one of the most significant technology sector offerings in history.