OpenAI Files Confidential IPO Prospectus With SEC, Targeting September Listing at Over $1 Trillion Valuation

OpenAI filed a confidential draft of its IPO prospectus with the US Securities and Exchange Commission on Friday, May 22, 2026, moving the company into the formal regulatory process for a public listing it is targeting as early as September. Goldman Sachs and Morgan Stanley are leading the offering. The company’s last private valuation stood at $852 billion, established during its $122 billion funding round closed in March — but public market investors are expected to price it above $1 trillion.

The timing of the filing is conspicuous. It came just three days after a jury dismissed Elon Musk’s lawsuit against OpenAI, which had alleged the company violated its founding charitable mission by pursuing a for-profit structure. That lawsuit, filed in February 2024 and amended multiple times, had cast a cloud over OpenAI’s corporate transformation — a cloud that, in the worst-case scenario, could have jeopardized the restructuring needed to take the company public in the first place.

With the lawsuit gone and the legal calendar clear, OpenAI moved within hours to trigger the IPO clock.

What a Confidential Filing Actually Means

A confidential IPO filing — technically a draft registration statement submitted under the JOBS Act — allows companies to share their prospectus with the SEC for private review before the document becomes publicly available. The SEC typically takes 30 days to respond with comments, after which the company can revise and refile. That process usually runs through two to three review cycles before the final S-1 is made public, typically three to four weeks before the actual offering.

Working backward from a September listing window, an early-June public prospectus would require the confidential filing to be substantially complete before the SEC review begins — which is consistent with a May 22 submission date. The timeline is aggressive but achievable if the SEC review process goes smoothly and market conditions remain favorable.

The confidential process gives OpenAI several advantages. It allows the company to receive regulatory feedback on complex disclosures — including the unusual structure of its nonprofit-to-public benefit corporation conversion, its compute dependency on Microsoft’s Azure, and its projected cash burn — without those discussions occurring in public view. It also lets OpenAI assess investor sentiment through roadshow previews before the final pricing is locked in.

The Financials That Will Define the Offering

Public market investors will scrutinize OpenAI’s prospectus through several lenses. The positive signals are significant: the company reported $25 billion in annualized revenue as of February 2026, up from $20 billion at the end of 2025 — roughly 25% growth in two months. ChatGPT has more than 400 million weekly active users. Enterprise adoption of the OpenAI API and GPT-5 has expanded across financial services, healthcare, legal, and software development.

The challenging signals are also real. OpenAI is projected to generate $57 billion in operating cash burn in 2027, a figure that reflects the staggering cost of training frontier models, running inference at scale for hundreds of millions of users, and building the infrastructure needed to stay competitive with Anthropic, Google DeepMind, and Meta AI. At its current trajectory, the company will need either dramatically higher revenue or a structural reduction in compute costs before it reaches sustainable profitability.

The IPO proceeds — combined with the $122 billion already raised in private markets — are intended to fund the compute investments required to maintain frontier model leadership through 2027 and beyond. Whether public market investors will accept the cash-burn profile that venture investors have tolerated is the central uncertainty of the offering.

The Post-Musk Legal Landscape

The dismissal of Musk’s lawsuit on May 19 removed what had been the most visible legal risk to OpenAI’s public offering. The case, in which Musk alleged that OpenAI’s transition from a nonprofit to a capped-profit structure violated its founding commitments, had attracted significant media coverage and added regulatory uncertainty to an already complex corporate transformation.

The jury’s finding — that Musk’s claims were time-barred — did not adjudicate the underlying merits of his argument that OpenAI had drifted from its safety-first origins. But it closed the legal avenue through which that argument could have disrupted the company’s structure. For the IPO, the practical effect is decisive: the PBC conversion can proceed, the governance documents can be finalized, and the prospectus can describe a stable, legally settled corporate structure.

OpenAI’s legal team has spent the past year preparing for a parallel track: fight the lawsuit while simultaneously designing the public company structure. With the lawsuit dismissed, all resources can now focus on the offering itself.

The Race With Anthropic

OpenAI’s September target puts it ahead of Anthropic’s reported October window — a sequencing that both companies are aware of and are managing strategically. The first of the two major frontier AI labs to reach public markets will set the valuation benchmark for the other. If OpenAI prices above $1 trillion and the stock performs well in the opening weeks, Anthropic benefits from a favorable comparable. If OpenAI’s offering is received poorly — due to cash burn concerns, governance skepticism, or a market-wide risk-off environment — Anthropic may find its October window more complicated.

The two companies are not direct competitors in the IPO sense, but their offerings will be compared. Investors who participate in OpenAI’s IPO will be making implicit judgments about Anthropic’s comparable valuation, and vice versa. The AI IPO wave of fall 2026 will effectively define how public markets price the frontier AI category.

SpaceX’s S-1, filed publicly on May 20 and targeting a June Nasdaq listing under the ticker SPCX, has added a third high-profile offering to what is shaping up as the most consequential IPO season in technology history.

Sam Altman’s Long Game

For Sam Altman, the confidential S-1 filing represents the culmination of a transformation he began engineering in 2019 when OpenAI first introduced its capped-profit structure. The journey from nonprofit research lab to potential trillion-dollar public company has traversed board room dramas, the brief November 2023 firing and reinstatement, the Microsoft megadeal, the departure of founding members, and the Musk lawsuit marathon.

The company that reaches public markets in September will look dramatically different from the one that Altman described in 2015 as “the research lab to benefit all of humanity.” It will be a corporation with hundreds of millions of users, $25 billion in annualized revenue, tens of thousands of employees, and the largest private investor base in technology history.

Whether that transformation represents a success or a compromise — of safety commitments, of the original nonprofit mission, of the ambitions its founders articulated — is a debate that will intensify as the S-1 becomes public and investors begin assigning a price to OpenAI’s version of beneficial AI. For now, the confidential filing says one thing clearly: the most consequential technology IPO since Google is officially in motion.