OpenAI raises $122 billion at an $852 billion valuation

Background: what a round and a valuation mean

A private technology company raises money by selling newly issued shares to investors rather than by borrowing or by listing on a stock exchange. Each such round is described by two numbers that are easy to confuse. One is the amount of capital committed: how much money the investors have promised to put in. The other is the valuation, the price at which those new shares are sold, which implies what the whole company is judged to be worth. A *post-money* valuation is measured after the new money has been counted, so it is always higher than the pre-money figure for the same deal. When a round is large, the valuation moves a long way even if the underlying business changes little in the same weeks, because the two numbers are set by negotiation rather than by trading in a public market.

Rounds of this kind rarely arrive in a single step. Companies often announce an initial size, then extend it as more investors ask to join, and finally report a closing figure once the commitments are signed.

What happened

OpenAI's 2026 round followed exactly that pattern. In February 2026 the company raised $110 billion at a $730 billion valuation^[1]. Three investors accounted for the bulk of the early commitments: Amazon contributed $50 billion, SoftBank $30 billion and Nvidia $30 billion^[1]. SoftBank Group led the round together with Andreessen Horowitz^[2].

In March 2026 the round was extended by $10 billion, taking the announced total to $120 billion^[1]. It closed on 31 March 2026 with $122 billion of committed capital at an $852 billion post-money valuation^[1][2].

Key details

The structure of the deal tells you as much as its size. Amazon's $50 billion was the largest single contribution, ahead of the $30 billion each from SoftBank and Nvidia^[1]. Amazon, Nvidia and Microsoft had backed OpenAI before, and all three took part in this round as well^[2]. SoftBank Group led alongside Andreessen Horowitz, a venture firm rather than a chipmaker or a cloud provider^[2]. The mix matters because the participants were not only financial investors: chip suppliers and cloud providers are also commercial partners of the company they were funding, so their money and their business relationships run in parallel.

The gap between the February announcement and the March closing is worth noting on its own. The headline figure rose twice — from $110 billion to $120 billion when the round was extended, and then to $122 billion at closing — while the valuation moved from $730 billion to $852 billion^[1][2]. A round of this kind therefore has no single price until it is closed; what gets reported in the middle of the process is a snapshot of a negotiation that is still moving.

A revised Microsoft partnership

The funding round was not the only structural change that month. In the same month, Microsoft and OpenAI announced a revised partnership^[1]. Microsoft was already a backer of OpenAI and participated in this round^[2], so the revision arrived at the same time as a very large injection of new capital from a wider group of investors.

Why it matters

The most obvious point is scale. Sums on the order of a hundred billion dollars are far outside the normal range for private venture financing, and a valuation approaching a trillion dollars places the company in the territory usually occupied by the largest listed technology firms rather than by startups. Companies at that scale are valued less on current revenue than on the expectation of future earnings, which makes the negotiated valuation a statement about expectations as much as about the present.

The composition of the investor list is the second point. When a chip designer, a cloud provider and a large investment group all put in money at once, the company's financing becomes entangled with its supply chain and its computing arrangements. That entanglement cuts both ways: it gives the company access to capital and to the hardware and data centres it needs, and it gives its backers a stake in the outcome of a business they also depend on or sell to.

Finally, the round illustrates how quickly figures in this sector can move. Within roughly two months the announced size of the round changed twice and the implied valuation rose by more than a hundred billion dollars^[1][2]. Anyone reading about such deals should note which number they are looking at — the announced size, the committed capital or the post-money valuation — and on what date it was reported.