OpenAI completed its corporate reorganization on October 28, 2025, turning its operating business into OpenAI Group PBC and giving Microsoft an approximately 27% stake. But the transaction did not make OpenAI publicly traded or hand it to Microsoft: the OpenAI Foundation retained control through special governance rights. An April 27, 2026 amendment later changed important parts of the Microsoft partnership, so the current arrangement is not identical to the one announced at closing.
What OpenAI completed in October 2025
The transaction was a recapitalization and corporate restructuring, not an IPO. OpenAI renamed its nonprofit the OpenAI Foundation and converted its operating business into OpenAI Group PBC, a public benefit corporation. The company said the new structure would make it easier to raise capital, issue equity and compensate employees while giving the Foundation a direct financial stake in the operating company. OpenAI’s completion announcement and its structure explanation describe the resulting organization.
“For-profit” does not mean “publicly traded.” OpenAI Group is a private company; the restructuring did not sell its shares to the public. Nor did the change simply turn OpenAI into an ordinary corporation with shareholder returns as its only legal concern.
Who owns OpenAI Group—and who controls it?
At the October 2025 closing, the Foundation held about 26% of OpenAI Group, Microsoft held about 27% on an as-converted diluted basis, and current and former employees and other investors held about 47%. The companies valued Microsoft’s stake at roughly $135 billion; the Foundation’s stake was described as approximately $130 billion. These are transaction-era figures, not public-market prices.
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| Holder at closing | Approximate economic stake | Governance position |
|---|---|---|
| OpenAI Foundation | 26% | Special rights let it appoint and replace OpenAI Group’s directors. |
| Microsoft | 27% | Major shareholder; no controlling board role is described in the announced structure. |
| Employees and other investors | 47% | Hold the remaining economic interests; the Foundation’s special board rights remain distinct. |
The percentages describe economic ownership, not control. The Foundation does not own a majority of the company’s ordinary equity, but its special voting and governance rights give it authority over the OpenAI Group board. Microsoft’s slightly larger economic stake therefore does not mean it controls OpenAI. The Foundation also retains a safety and security governance role across the organization. See OpenAI’s structure page for the company’s account of these rights.
What a public benefit corporation means
A public benefit corporation, or PBC, is a for-profit corporate form that must pursue stated public benefits and consider stakeholder interests alongside shareholder returns. It is not a nonprofit or a charitable organization. The designation creates legal obligations, but it does not by itself guarantee that mission goals will override every commercial decision.
In OpenAI’s case, two things should be kept separate: OpenAI Group’s PBC obligations and the Foundation’s specific governance authority. The former shapes the company’s legal purpose; the latter supplies a concrete mechanism for control. OpenAI outlined its proposed structure in its May 2025 explanation and describes the completed arrangement on its current structure page.
Why OpenAI wanted the change
OpenAI said its capped-profit model had become difficult to use as it competed for capital and talent. A more conventional equity structure could make fundraising and employee incentives more practical. The Foundation, meanwhile, would benefit financially if OpenAI Group grew while retaining governance control.
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The structure also makes it more feasible to finance large-scale computing, research and hiring, although that is an inference about the practical effect rather than a guarantee that any particular financing will occur. The company’s stated rationale appears in its explanation of the proposed reorganization and its announcement of completion.
Why Microsoft’s support mattered
Microsoft had invested heavily in OpenAI and held important contractual and economic rights. Changing OpenAI’s corporate structure therefore required a reset of the companies’ partnership as well as a new ownership arrangement. Microsoft supported OpenAI’s board moving forward with the PBC formation and recapitalization, removing a major obstacle to the restructuring. That is more precise than saying Microsoft approved every element of OpenAI’s governance.
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At the October 2025 closing, Microsoft received approximately 27% of OpenAI Group and retained substantial technology and cloud-related rights. OpenAI also agreed to purchase an additional $250 billion of Azure services. That figure is a services commitment—not a $250 billion Microsoft equity investment or cash payment to OpenAI. The initial terms are set out in the October 2025 partnership announcement; Microsoft’s FY2026 first-quarter earnings call also addressed the Azure commitment.
What Microsoft’s agreement provided at closing
The October 2025 deal preserved significant parts of the partnership while changing others. Its terms included Microsoft’s OpenAI model and product IP rights through 2032, Azure exclusivity for OpenAI stateless APIs under the then-current arrangement, and revenue-share rights linked to the agreement’s AGI-related process. Microsoft also gave up its right of first refusal to be OpenAI’s compute provider.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesThe announced AGI mechanism called for an independent expert panel to verify an OpenAI declaration of AGI. Microsoft’s IP rights covered certain post-AGI models subject to safety guardrails. These contractual provisions did not establish that AGI had been achieved. The original terms are described in the October 2025 agreement announcement.
What changed in April 2026
On April 27, 2026, OpenAI and Microsoft amended their partnership. The changes made the relationship less exclusive in some respects but did not end it. Under the current terms announced by OpenAI:
- Microsoft remains OpenAI’s primary cloud partner, and OpenAI products launch first on Azure unless Microsoft cannot or chooses not to provide the required capabilities.
- OpenAI may serve its products to customers through any cloud provider. Azure remains exclusive for stateless OpenAI APIs under the announced arrangement.
- Microsoft’s license to OpenAI model and product IP continues through 2032 but is now nonexclusive.
- Microsoft no longer pays revenue share to OpenAI. OpenAI’s payments to Microsoft continue through 2030, independently of technological progress and subject to a total cap.
- The companies continue broader collaboration involving data centers, silicon, cybersecurity and AI platforms, and Microsoft remains a major shareholder.
These terms come from OpenAI’s April 27, 2026 announcement. They supersede the earlier revenue-share timing framework: current payments from OpenAI to Microsoft are described as continuing through 2030, rather than ending when an expert panel verifies AGI.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What regulators reviewed
California and Delaware officials engaged with OpenAI over the restructuring. Delaware Attorney General Kathy Jennings said her office completed its review without opposing the recapitalization. The review focused on preserving nonprofit control and the public-safety mission, treating the nonprofit fairly, maintaining its access to OpenAI technology and resources, and providing advance notice of significant governance changes. That is not the same as regulators endorsing every commercial term.
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The Delaware office’s account is available in its October 28, 2025 statement. The Associated Press coverage provides contemporaneous context.
What the reorganization means for customers and the AI market
For Microsoft customers, the partnership remains substantial: Azure is still the primary cloud partner, and Microsoft’s license continues through 2032. OpenAI’s expanded ability to serve products through other cloud providers creates more flexibility for distribution, but it does not mean Azure has ceased to matter.
For investors and employees, the new structure offers a more conventional way to hold equity in OpenAI Group. For the Foundation, its stake creates a financial interest in the operating company’s success, while its board rights preserve control. These arrangements leave real trade-offs: commercial pressure remains, Microsoft’s economic exposure is significant, and the Foundation’s ability to enforce mission priorities depends in part on the governance rights and safeguards built into the structure.
Quick Recap
What the deal does not mean
- OpenAI did not go public; there was no IPO in this transaction.
- Microsoft did not take control of OpenAI. It owns a significant minority stake in OpenAI Group.
- The Foundation does not own a majority of OpenAI Group’s equity, even though it controls the board through special rights.
- The reorganization and the partnership amendments do not prove that OpenAI has achieved AGI.
- The Microsoft–OpenAI partnership did not end; it was amended and continues under revised terms.
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