OpenAI's For-Profit Conversion Structure: $130B Foundation Stake, Microsoft's 27%

OpenAI completed its for-profit conversion on October 28, 2025: the nonprofit Foundation kept 26% equity (~$130B) and full board control, Microsoft took 27% (~$135B), and the old 10x profit cap on investor and employee returns is gone. That's the short answer. The longer answer is more interesting.

I've had more LPs and founders ask me to explain OpenAI's ownership structure in the past six months than any other single topic in AI. Part of that is curiosity about who actually controls a company now worth more than most S&P 500 constituents. Part of it is that the restructuring changed how every employee's equity works, which matters to anyone with OpenAI alumni on their cap table or in their portfolio. Here's what actually changed, with the real numbers.

What Is OpenAI's For-Profit Conversion Structure in 2026?

OpenAI's for-profit conversion structure, finalized October 28, 2025, replaced the old capped-profit LLC with OpenAI Group PBC, a Delaware public benefit corporation, sitting under the nonprofit OpenAI Foundation. The Foundation holds a 26% equity stake (~$130B) but retains exclusive rights to appoint and remove the entire board, Microsoft holds roughly 27% (~$135B) as the largest outside investor, and employees and other investors split the remaining 47%, with the old 10x profit cap on returns eliminated entirely.

The deal took almost a year to negotiate. California Attorney General Rob Bonta and the Delaware Attorney General both had to sign off, and both extracted commitments before agreeing: charitable assets had to stay dedicated to their original purpose, safety commitments had to be documented, and OpenAI had to commit to keeping its headquarters in California. The result is a structure that looks unusual on paper — a company two-thirds controlled by outside capital but 100% governed by a nonprofit board — and that tension is exactly why it took so long to finalize.

Before vs. After: How the OpenAI For-Profit Conversion Structure Changed the Company

The cleanest way to see what changed is side by side. OpenAI operated as a capped-profit LLC from 2019 until October 2025, with the nonprofit board controlling everything but tracking no formal equity stake for itself. The new structure inverts that ambiguity: the Foundation now holds an explicit, valued equity position while keeping the governance control it always had.

Figures are 2026 estimates blended from OpenAI's official "Evolving our structure" announcement, CNBC, Forbes, and the California Attorney General's public statement on the closing. Valuations reflect the price basis of the referenced funding or secondary event, not a single point-in-time mark.

Who Owns OpenAI Now: Foundation, Microsoft, and Everyone Else

The ownership split breaks into three roughly comparable pieces. The OpenAI Foundation holds 26%, worth about $130 billion off the $500 billion valuation set at closing. Microsoft holds approximately 27%, valued around $135 billion, reflecting its cumulative investment since 2019 converted into as-converted diluted equity. The remaining 47% is spread across current and former employees, SoftBank, Thrive Capital, and other institutional investors who participated across OpenAI's funding history, including the $6.6 billion employee secondary sale that closed alongside the restructuring in October 2025.

What makes this unusual isn't the split itself — plenty of companies have a plurality shareholder with minority board control baked into a founder class of stock. It's that the Foundation's control isn't derived from a supervoting share class at all. It's a standalone governance right written into the recapitalization documents, meaning Microsoft's larger economic stake carries no proportional say over the board. For anyone tracking how AI-company governance compares across the sector, our AI Valuations dashboard tracks pricing and structure across OpenAI, Anthropic, and xAI.

OpenAI's Valuation Since the For-Profit Conversion Structure Closed

The restructuring didn't just change governance — it unlocked a valuation run that's hard to overstate. OpenAI priced its October 2024 funding round around $157 billion. By October 2, 2025, a $6.6 billion secondary sale (part of a larger $10.3 billion offering) priced the company at $500 billion, briefly making it the most valuable startup in the world, ahead of SpaceX. Five months later, OpenAI closed a $122 billion primary round at an $852 billion post-money valuation in March 2026 — roughly 35x its trailing annualized revenue at the time.

Revenue growth tracks the story, though not at the same multiple. OpenAI's annualized recurring revenue moved from about $5.5 billion at the end of 2024 to $10 billion by June 2025, $13 billion by August 2025, and roughly $2 billion a month in run-rate revenue by mid-2026 — implying an ARR north of $20 billion. That's real growth, but a 35x revenue multiple at $852 billion still assumes a lot about frontier-model economics holding up over the next five years.

What the Conversion Means for Employees: PPUs Become Real Equity

Before the restructuring, OpenAI compensated staff with Profit Participation Units — PPUs — which vested over four years at 25% a year with no cliff, but capped total upside at roughly 10x the unit's original grant value. A $2 million PPU grant topped out at $20 million no matter how much the company's value grew beyond that. Under the new structure, each outstanding PPU converts into an equivalent number of OpenAI Group PBC shares at a fixed ratio, eliminating the cap and giving employees the same uncapped upside (and downside) as any other shareholder.

That conversion is already showing up in liquidity events. OpenAI ran a $6.6 billion employee tender in October 2025 at the $500 billion valuation, and by June 2026 was preparing another round at $687.69 per share, implying the $852 billion valuation. Total compensation for engineers now regularly cited in the $400,000 to $1.28 million range for mid-to-senior levels is real because the underlying equity is no longer capped — a structural change with a direct effect on how OpenAI competes for talent against Anthropic, Google DeepMind, and Meta Superintelligence Labs.

Is OpenAI's For-Profit Conversion Structure Good for Investors?

For investors, the honest answer is: it depends which investor. For Microsoft and the large late-stage backers — SoftBank, Thrive Capital, Dragoneer, MGX, T. Rowe Price — removing the profit cap converts what was economically closer to a structured debt-like instrument into conventional upside equity, which is unambiguously better if OpenAI keeps growing. For anyone evaluating a position today at an $852 billion valuation and a 35x revenue multiple, the calculus is closer to any other richly priced late-stage private: you're underwriting continued 2-3x annual revenue growth, not buying a discount.

The governance risk also didn't disappear — it changed shape. A 26% equity holder with 100% board control is unusual enough that any investor writing a check now needs to underwrite the Foundation's incentives as carefully as the company's growth rate. The Foundation's stated mission areas — health breakthroughs and AI resilience, backed by that initial $25 billion commitment — are not shareholder-value-maximizing mandates by design, and Elon Musk's ongoing litigation over the original nonprofit-to-for-profit conversion is still working through the courts as of mid-2026, adding a real tail risk that didn't exist for a simple cap-table check.

We track how AI-sector governance and pricing questions like this show up across portfolios on the VC Performance dashboard and Fund Benchmarking tool — for LPs with exposure through secondaries or fund-of-funds structures, understanding who actually controls OpenAI matters as much as the headline multiple.

Why California and Delaware Regulators Signed Off on the Conversion

Two state attorneys general effectively had veto power over the deal, since OpenAI's original nonprofit was chartered in Delaware and headquartered in California. California AG Rob Bonta said his office "secured concessions that ensure charitable assets are used for their intended purpose, safety will be prioritized," and extracted a commitment that OpenAI remain headquartered in California. Delaware's AG separately required binding safety and oversight provisions written directly into the recapitalization documents rather than left as informal promises.

Those concessions are why the Foundation ended up with a 26% equity stake instead of zero: regulators wanted a hard, valued asset backing the nonprofit's mission, not just a governance right on paper. The $25 billion initial philanthropic commitment — split between open health datasets and AI-resilience research — was negotiated as part of the same package, and it's the mechanism both AGs pointed to when explaining why they approved a deal that hands majority economic ownership to for-profit shareholders while a nonprofit keeps the board.