TL;DR
Anthropic has confidentially filed a draft S-1 with the SEC, while OpenAI is expected to seek its own confidential IPO filing as soon as June 5, according to source material and prior reporting. The filings matter because public-market disclosure could force investors to price governance structures that private funding rounds have treated as part of each lab’s mission story.
Anthropic has confidentially submitted a draft S-1 to the SEC, and OpenAI is expected to make its own confidential IPO filing as soon as June 5, putting two leading AI labs on a path where unusual governance structures, partner rights and litigation history may have to be disclosed to regulators and priced by public investors.
Anthropic announced on June 1 that it confidentially submitted a draft registration statement on Form S-1 for a proposed IPO of its common stock. The company said the number of shares and price have not been set, and that any offering depends on SEC review, market conditions and other factors.
OpenAI’s filing has not been publicly confirmed. The Thorsten Meyer AI source material says OpenAI is expected to file confidentially as soon as Friday, June 5, while Axios reported on May 20 that OpenAI was working on a confidential IPO prospectus and that timing remained fluid.
The core issue is disclosure. A confidential filing is not the public prospectus, but it begins the process in which SEC staff, underwriters and auditors examine revenue, risk factors, corporate control, related-party arrangements and legal exposure before a public S-1 reaches investors.
Why It Matters
The filings matter because OpenAI and Anthropic are not conventional software issuers. Their value is tied not only to revenue growth, but also to governance promises about safety, mission control and the handling of advanced AI systems.
For OpenAI, the source material identifies a heavier disclosure load: a nonprofit-to-capped-profit-to-public-benefit-corporation history, a Foundation said to hold roughly $130 billion in value and control the board, Microsoft ownership of about 27% with revenue rights linked to verified AGI, and recent litigation involving co-founder Elon Musk.
For Anthropic, the source material describes a cleaner starting point because it was organized as a public benefit corporation from inception. It still faces questions tied to its Long-Term Benefit Trust, which the source says will elect a majority of directors, and a gross-versus-net revenue-recognition issue that could affect how investors read reported growth.
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Background
The IPO process would convert what private investors have treated as governance narrative into securities disclosure. In a funding round, founders can frame unusual structures as mission protection. In a public prospectus, those same structures become risk factors, control disclosures and financial footnotes.
OpenAI’s history is central to the expected S-1 because its corporate structure changed as it sought more capital for model development and infrastructure. The source material frames the company’s restructuring as the main disclosure burden, especially where nonprofit mission duties, shareholder rights and Microsoft’s commercial rights intersect.
Anthropic’s public-market path is different. Its confirmed confidential filing means it has already entered SEC review, but the private draft is not yet visible. Until the public S-1 is released, investors cannot compare its governance language, revenue presentation or risk factors with OpenAI’s.
“A confidential filing is still a filing.”
— Thorsten Meyer AI source material
“The number of shares to be offered and the price have not yet been set.”
— Anthropic, in its June 1 announcement
“As part of normal governance, we regularly evaluate a range of strategic options. Our focus remains on execution.”
— OpenAI spokesperson, quoted by Axios
“the S-1 is the great equalizer of narrative”
— Thorsten Meyer AI source material
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What Remains Unclear
It is not yet clear whether OpenAI has filed confidentially or will do so on June 5. The public has not seen either company’s full S-1, so the exact risk factors, revenue presentation, Microsoft-related disclosures, AGI language, litigation disclosures and governance wording remain unknown.
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What’s Next
SEC review is the next step. If either company moves ahead, a public S-1 would be released before investor marketing, giving the market its first formal look at the financials, control structure, risk factors and legal disclosures behind the AI labs’ private valuations.
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Key Questions
What happened?
Anthropic confidentially filed a draft S-1 with the SEC on June 1, and OpenAI is expected to seek a similar confidential filing as soon as June 5, according to the source material and prior reporting.
Has OpenAI confirmed an IPO filing?
No public confirmation is cited in the source material. The filing is described as expected, while prior reporting said the timing was fluid.
Why does the prospectus matter?
The S-1 forces companies to describe risks, control rights, financial dependencies and legal matters in a regulated document. For AI labs, that means mission governance and commercial rights may become investor-priced disclosures.
How is Anthropic different from OpenAI?
Anthropic was structured as a public benefit corporation from inception, while OpenAI has a more complex conversion history. Anthropic still faces its own governance and revenue-disclosure questions.
Can a confidential IPO filing be withdrawn?
Yes. A confidential S-1 gives a company the option to pursue an IPO after SEC review, but it does not commit the company to sell shares.
Source: Thorsten Meyer AI
