Governance is controlled by the OpenAI Foundation, which has special voting and governance rights and can appoint or replace OpenAI Group directors. Economically, OpenAI's 2025 structure page disclosed that the Foundation held 26%, Microsoft roughly 27%, and the remaining 47% was held by current and former employees and investors. A fully updated cap table after the 2026 $122 billion round has not been published.

Who are OpenAI's biggest shareholders?

The OpenAI Foundation is the clearest official long-term beneficiary because it has a 26% stake and a warrant. Microsoft is the largest clearly disclosed outside shareholder, at roughly 27% as of the 2025 recapitalization. SoftBank, Amazon, NVIDIA, Thrive, a16z, and others are major investors, but their exact ownership percentages are not fully public.

How much did Microsoft invest in OpenAI?

OpenAI officially announced Microsoft's $1 billion investment in 2019. In 2023, Microsoft announced a multiyear, multibillion-dollar expansion of the partnership. In the 2025 recapitalization, OpenAI disclosed that Microsoft held roughly 27% of OpenAI Group. Historical investment dollars, cloud contracts, and the value of Microsoft's post-recap stake should not be treated as the same number.

No. As of June 7, 2026, OpenAI is still private. There has been IPO reporting and market speculation, but this page only organizes public company information and sourced media reports. It is not investment advice.

Who Owns OpenAI? Investors, Microsoft's Stake & the Nonprofit-for-Profit Structure

Governance control and economic ownership are not the same thing. The OpenAI Foundation controls governance (appoints and replaces all directors). OpenAI Group PBC runs the commercial business. The Foundation controls the mission; Microsoft, employees, and outside investors hold the economics.

This page is informational — no buy-sell view on any stock. For the broader picture, start with What kind of company is OpenAI.

The 30-Second Answer

As of OpenAI’s 2025 recapitalization, the official economic split was: OpenAI Foundation 26%, Microsoft roughly 27%, and the remaining 47% held by current and former employees and investors.

But that is not a forever cap table. OpenAI later closed a 2026 round with $122 billion in committed capital at an $852 billion post-money valuation, and in August completed a roughly $7 billion employee tender offer at the same valuation, giving employees early liquidity. The company has not published a fully updated ownership table since, so 26% / 27% / 47% should be read as the 2025 recapitalization disclosure, not current precise percentages.

The short version: Microsoft does not simply “own OpenAI.” OpenAI is Foundation-controlled, with Microsoft and a long roster of investors holding economic stakes and with cloud and chip partners supplying the compute lifeline.

Nonprofit Control, PBC Economics

OpenAI’s structure page splits the system into two layers:

OpenAI Foundation: nonprofit, 26% stake plus a warrant, appoints all directors.
OpenAI Group PBC: commercial entity. Microsoft ~27%, remaining 47% held by employees and investors.

This lets OpenAI raise very large amounts and sign compute contracts while keeping a nonprofit governance layer. The trade-off: governance, economics, and compute supply sit with different groups, so “who owns the most” doesn’t tell you who decides.

OpenAI’s Main Investors and Funding Rounds

Here are the clean public milestones:

Date	Amount and Valuation	Main Investors / Role	Notes
2019	Microsoft invested $1 billion	Microsoft	Investment tied to Azure supercomputing partnership
2023	Multiyear, multibillion-dollar partnership	Microsoft	Microsoft did not state one fixed total in the announcement
2024	$6.6 billion raised at a $157 billion post-money valuation	Thrive, Microsoft, NVIDIA, SoftBank, others	Official amount and valuation; investor detail supplemented by reporting
2025	$40 billion raised at a $300 billion post-money valuation	SoftBank	Official OpenAI announcement names the SoftBank partnership
2026	$122 billion committed capital at an $852 billion post-money valuation	Amazon, NVIDIA, SoftBank, Microsoft; co-led by SoftBank, a16z, and others	Official announcement also lists a broad global institutional investor roster

Two things matter in that table.

First, Microsoft remains the clearest large outside shareholder by official percentage: roughly 27% at the 2025 recapitalization. Second, OpenAI’s 2026 investor base became much wider, with Amazon, NVIDIA, SoftBank, a16z, D. E. Shaw Ventures, MGX, TPG, T. Rowe, Altimeter, BlackRock-affiliated funds, Blackstone, Coatue, Dragoneer, Fidelity, Sequoia, Temasek, Thrive, and others named in the official announcement.

The conservative reading: except for the Foundation and Microsoft percentages disclosed in the 2025 structure page, OpenAI has not published a complete shareholder-by-shareholder cap table.

More Than Money: Cloud, Chips, and Data Centers

OpenAI’s investor map is also a compute map.

In its 2026 funding announcement, OpenAI described its infrastructure strategy across three layers: cloud through Microsoft, Oracle, AWS, CoreWeave, and Google Cloud; silicon through NVIDIA, AMD, AWS Trainium, Cerebras, and its own chip partnership with Broadcom; and data centers through Oracle, SBE, and SoftBank.

That is why investors and suppliers overlap. Microsoft is the long-running cloud partner. NVIDIA is both a chip supplier and investor. Amazon enters both through AWS and as a 2026 strategic investor. SoftBank sits on both the capital and infrastructure side.

For OpenAI, the upside is that funding, GPUs, cloud capacity, and data-center buildout can be stitched together. The cost is dependence. A supplier can also be a shareholder; a shareholder can also be a cloud or chip vendor; every partnership is also a negotiation.

Backing and Governance Pressure

OpenAI has extraordinary backing. The company raised $6.6 billion in 2024, $40 billion in 2025, and $122 billion in committed capital in 2026. That scale tells you investors are underwriting not just a product company, but a model, compute, and infrastructure race.

The other side is governance pressure. The Foundation controls the board. The PBC runs the commercial engine. Microsoft, SoftBank, Amazon, NVIDIA, and other partners touch either the economics or the infrastructure. That setup can align mission, capital, and growth; it can also turn every restructuring, IPO step, supply contract, or safety dispute into a governance test.

So the better question is not only “who owns the most?” It is: how does the Foundation use its control rights? How does Microsoft’s roughly 27% economic stake interact with cloud partnership terms? Did the 2026 round change bargaining power? Those questions are where ownership actually affects OpenAI.

Penchan’s Take

OpenAI ownership gets misread because people try to map it onto an ordinary corporate shareholder model.

The useful model is a triangle: Foundation governance control, Microsoft and other investors’ economic ownership, and cloud and chip partners’ compute supply. Each side supports the others; each side also constrains the others.

The practical answer as of June 7, 2026 is this: OpenAI remains private, the full cap table is not public, and the clean official percentages are from the 2025 recapitalization: Foundation 26%, Microsoft roughly 27%, and the remaining 47% held by current and former employees and investors. The 2026 mega-round adds important investors, but not a fully updated public ownership table. This page is an ownership explainer, not investment advice.

Further reading: What kind of company is OpenAI, OpenAI valuation and IPO, OpenAI’s Stargate compute strategy.