It’s confirmed now. OpenAI’s newsroom posted the filing announcement on June 8, 2026: a confidential draft S-1 registration statement submitted to the Securities and Exchange Commission. That’s the formal first step in the public offering process, and it lands one week after Anthropic made the same move.
The filing itself won’t be public for some time. A confidential S-1 lets companies work through SEC review before exposing financials to competitors and the press. OpenAI said the announcement was preemptive, the company indicated it expected the filing to become known and chose to announce it directly rather than let it leak. The company also noted the filing “gives us the option to go public sooner,” according to OpenAI’s announcement, while flagging that certain initiatives remain easier as a private company, per the same June 8 statement. No target listing date has been disclosed.
OpenAI’s last confirmed private valuation was $852 billion, set when the company closed a funding round on March 31, 2026, raising $122 billion in committed capital, both figures confirmed via openai.com. Analysts and investors have cited valuation targets in excess of that private round figure, though no IPO price range has been disclosed. Goldman Sachs and Morgan Stanley are reported to be leading the offering, according to media reports, though OpenAI has not publicly confirmed the underwriter assignments, and at least one cross-reference source attributes those same banks to Anthropic’s separate IPO process.
That last point deserves attention. The underwriter question isn’t a minor footnote. Whoever leads OpenAI’s book-building sets the institutional investor roadshow, shapes the valuation narrative, and manages the lock-up structure. Confirming the banks directly from OpenAI or a regulatory filing matters, and that confirmation isn’t available yet.
The IPO race framing has been well-covered. What’s less discussed is what the June 8 filing date actually means in the context of OpenAI’s corporate history. This isn’t a straightforward technology company going public. Over the past year, OpenAI converted from a capped-profit structure to a proposed public benefit corporation, a legal transformation with no direct precedent in the S-1 filing record. The S-1’s eventual public version will have to explain that conversion to institutional investors in terms they can price. That’s a harder job than Anthropic faces.
This is the third major IPO signal in the AI sector in ten days. The three-lab convergence toward public markets is no longer a forecast. SpaceX’s roadshow is live, Anthropic’s S-1 is with the SEC, and now OpenAI’s is too. The Q4 2026 window is taking shape as the most concentrated AI equity event in market history.
What to watch
SEC review timelines for confidential S-1 filings typically run 30 to 60 days before a company can begin its roadshow. That puts OpenAI’s earliest possible public S-1 filing in late July or August, setting up a September roadshow if the company decides to move quickly. Watch for the underwriter announcement as the first hard signal of timing. If Goldman and Morgan Stanley are confirmed directly, the roadshow calendar gets real fast.
The real story is whether OpenAI’s corporate structure, the nonprofit-to-public-benefit-corp conversion and the reported Microsoft equity position in the new entity, can be packaged into a prospectus that institutional investors treat like a standard tech IPO. The $852B private round set a floor. The public market will set the ceiling. Those two numbers don’t have to agree.