After its $122B March 2026 round, OpenAI is valued at $852B post-money, the largest single private financing on record. Here's the full funding history and what's behind the number.
Figures as of October 2026. Valuation is the most recent post-money round; run-rate is an annualized figure.
OpenAI's most recent post-money valuation is $852B, set by the $122B round that closed in March 2026. That is the figure most people are after when they search for its market cap. A true market cap only exists once a company's shares trade publicly, which won't happen until OpenAI's IPO.
Every disclosed round, newest first, with the post-money valuation it set.
| Round | Date | Raised | Post-money | Lead investors |
|---|---|---|---|---|
| March 2026 round | March 2026 | $122B | $852B | SoftBank, Andreessen Horowitz, D.E. Shaw Ventures, MGX, TPG |
| Recapitalization & tender | October 2025 | – | $500B | Thrive Capital, SoftBank |
| SoftBank-led round | March 2025 | $40B | $300B | SoftBank |
$122B raised · led by SoftBank, Andreessen Horowitz, D.E. Shaw Ventures, MGX, TPG
Co-led by SoftBank with a16z, D.E. Shaw Ventures, MGX, TPG, and T. Rowe Price-advised accounts. Strategic partners Amazon ($50B), NVIDIA ($30B), and Microsoft also participated. The largest single private financing on record; at least $35B of the headline figure is contingent.
Converted the for-profit into OpenAI Group PBC, controlled by the nonprofit OpenAI Foundation (which holds equity worth ~$130B). An employee tender offer let staff sell shares at a ~$500B valuation. Microsoft's stake was aligned to the new PBC structure at roughly 27%.
$40B raised · led by SoftBank
SoftBank led the then-largest private tech round, with participation from Microsoft, Coatue, Altimeter, and Thrive Capital.
Before the rounds above, OpenAI was funded by founding pledges to the nonprofit, then by Microsoft, then by its first large venture round. Amounts include tranches paid over time; much of Microsoft's money came as cloud credits.
| Round | Date | Raised | Post-money | Lead investors | Notes |
|---|---|---|---|---|---|
| October 2024 round | October 2024 | $6.6B | $157B | Thrive Capital | Microsoft, Nvidia and SoftBank also took part; investors could claw money back if OpenAI did not convert to a for-profit company. |
| Microsoft | January 2023 | $10B | Not disclosed | Microsoft | A multi-year investment two months after ChatGPT launched, with Microsoft entitled to a share of OpenAI's profits. |
| Microsoft | 2021 | $2B | Not disclosed | Microsoft | Further Microsoft funding through 2022, largely in cloud credits. |
| Microsoft | July 2019 | $1B | Not disclosed | Microsoft | Followed the creation of a capped-profit company under the nonprofit; Azure became OpenAI's exclusive cloud. |
| Founding pledges | December 2015 | $1B | Not disclosed | Elon Musk, Sam Altman, Reid Hoffman, Peter Thiel, others | Pledged to the nonprofit at its launch; only about $133M had actually arrived by 2021. |
Who these investors are, and what they own today, is on the investors page.
Annualized run-rate revenue, the metric most often cited for OpenAI.
OpenAI's valuation went from $157 billion in October 2024 to $852B post-money in March 2026, more than 5 times higher in 17 months. Revenue grew quickly over the same period, from about $6 billion annualized at the end of 2024 to tens of billions, but the valuation grew faster.
At $852B on a run-rate of $70B, OpenAI is valued at about 12 times annualized revenue. Treat that as a rough yardstick: a run-rate annualizes a recent month, and the valuation is a post-money figure from a private round.
Investors are paying for reach. ChatGPT has the largest audience in AI, and OpenAI's bet is that it can turn more than a billion weekly users into subscription, enterprise and advertising revenue on a scale only Google and Meta have reached before.
They are also underwriting a very large spending plan. OpenAI's compute commitments run far ahead of its revenue, so the valuation assumes growth big enough to pay for them. Reports in April 2026 that it had missed internal revenue targets showed how sensitive the number is to that assumption.
Rival Anthropic later raised at a $965B mark on a higher run-rate, overtaking OpenAI's private valuation for the first time, though OpenAI remains the larger consumer business and trades on a higher revenue multiple.
| Company | Valuation | Revenue run-rate | Implied multiple | As of |
|---|---|---|---|---|
| OpenAI (this page) | $852B | $70B | ~12× | September 2026 |
| Anthropic | $965B | $65B | ~15× | July 2026 |
Sources: latest post-money rounds and Sacra reporting. Private valuations are set at funding events, not by a live market.
More on Anthropic's valuation, IPO, and how to invest is available at Anthropic Stock.
A private company's valuation is the price agreed in its latest funding round, applied to all its shares. The post-money figure includes the money just raised. It is negotiated between the company and a small group of investors, not set by a market that trades every day.
OpenAI's valuations come with unusual fine print. Until October 2025, investors bought into a capped-profit company whose returns were limited, and the October 2024 round let investors ask for their money back if OpenAI did not convert to a conventional for-profit structure. Large parts of recent rounds are also conditional: at least $35 billion of the March 2026 round depends on conditions being met.
Employees have sold shares to investors at set prices, most recently at about $500 billion in October 2025, and shares change hands on secondary markets, usually only for professional investors. Those prices are not an official valuation.
Once OpenAI lists, its value will be set every trading day by its share price times the number of shares: its market capitalization. Sam Altman is reported to want more than $1 trillion, and with the listing now expected in 2027, OpenAI may raise more private money first, possibly at a higher valuation.
Two features will make the comparison with private rounds less direct: the OpenAI Foundation's control of the board and its warrant for extra shares, and Microsoft's revenue share through 2030. Both affect what an ordinary share is entitled to.
Follow the listing on the IPO page.