The round closed on March 31, 2026, expanding from the $110 billion figure OpenAI announced in February. The final close at $122 billion represents a $12 billion increase over that earlier figure, not a new announcement, but a completed transaction that now sets the terms for OpenAI’s next chapter.
The investor composition tells the real story. Bloomberg reporting confirmed the breakdown: Amazon committed $50 billion, Nvidia committed $30 billion, and SoftBank committed $30 billion. These aren’t passive financial bets. Amazon is OpenAI’s primary cloud infrastructure provider. Nvidia supplies the GPU hardware that runs its models. SoftBank holds a diversified AI portfolio with OpenAI as its anchor position. Each investor is buying deeper into a relationship they already depend on.
The reported post-money valuation of $852 billion places OpenAI in company shared by a handful of public technology giants, without the disclosure requirements that come with a public listing. For context, that valuation exceeds the market capitalization of most S&P 500 constituents. The figure comes from multiple independent financial outlets, including The Guardian and Bloomberg, though as a private company OpenAI is not subject to mandatory filing requirements that would independently confirm the number.
Revenue context matters here. According to reporting by The Information (via Reuters), OpenAI has surpassed $25 billion in annualized revenue, up from $21.4 billion at year-end, representing roughly $2 billion per month in run-rate terms. That figure comes from secondary reporting, not an OpenAI filing, but it establishes the commercial trajectory that justifies investor confidence at this scale.
According to reporting, a portion of Amazon’s $50 billion commitment is reportedly contingent on OpenAI reaching an IPO or specific technology milestones. The terms haven’t been independently confirmed in available source excerpts, but the structure itself is the signal. Contingency provisions tied to a public offering are standard instruments when investors want downside protection alongside upside exposure, and they put a clock on OpenAI’s IPO timeline whether the company has announced one or not.
This round is the fourth large-scale AI capital event in the past 30 days of pipeline coverage. Mistral raised $830 million in debt financing. Anthropic reported doubled subscriber growth. Now OpenAI closes $122 billion in equity. The pattern isn’t coincidental, it reflects a market that has stopped debating whether AI infrastructure is a durable investment thesis and started competing for position within it.
What to watch: whether OpenAI files for an IPO within the window implied by Amazon’s reported contingency terms; how competitors respond to a funding environment increasingly defined by strategic investors with conflicting interests; and whether the $852 billion valuation holds as the company moves toward public markets. The February-to-March round expansion suggests the investor appetite exceeded even OpenAI’s initial expectations. That dynamic rarely reverses quietly.