SoftBank Group is the investor with the most money riding on OpenAI, and this week it lost its clearest path to cashing out. Sam Altman told a magazine profile that OpenAI will not go public in 2026. SoftBank shares closed down more than 11% on Monday at 5,795.0 yen, one of the steepest drops on the Nikkei 225, an index that itself fell 2% that day.
The mechanics explain the reaction better than the sentiment does. A 2026 listing would have given SoftBank a fast, liquid way to realize value from a stake it has built at extraordinary size. Masayoshi Son’s firm has committed roughly $65 billion to OpenAI and expects to have deployed that full amount by October. Without an IPO, that capital stays locked in a private position, and SoftBank’s leverage against it does not shrink.
That leverage is the second half of the story, and it is why the timing looks worse than a single bad headline. Blockonomi, the outlet that first reported this account (citing Bloomberg for the loan figures), noted that SoftBank has arranged an $11.87 billion two year credit facility from roughly 20 banks, a deal that beat its own initial $10 billion target. The company is separately weighing a dollar bond offering of up to $20 billion and a $10 billion margin facility backed by its OpenAI stake itself, both still under consideration rather than arranged. None of that borrowing retires existing debt. SoftBank also told the market last week that it plans to repay $25.9 billion of a $40 billion credit line it originally raised to fund the OpenAI position, with that payment due September 15, the day after the stock drop.
Line up the two pieces of news and the picture is one investor doing two contradictory things in the same week: closing off the fastest route to liquidity while adding fresh debt to keep the position funded. That is a normal move for a firm that believes its bet will pay off eventually. It is also exactly the setup that makes a stock punish a company on a single data point, because it raises the stakes on everything else going right.
The other pressure on the stock came from within the AI industry rather than from OpenAI’s timeline. Anthropic chief executive Dario Amodei used the same period to argue publicly for slowing AI development, a position Elon Musk also voiced support for and that OpenAI said it agreed with.
A slowdown call from a leading lab founder matters to SoftBank beyond the OpenAI position specifically. Arm, SoftBank’s chip design subsidiary, has been one of the clearest financial beneficiaries of the AI buildout, and its valuation is now a load-bearing piece of SoftBank’s balance sheet. Any real deceleration in AI infrastructure spending would hit Arm’s growth story at the same time SoftBank’s OpenAI stake loses its exit route, a combination the market appears to be pricing for the first time this week.
None of this erases SoftBank’s run: the stock is still up about 26% for the year even after Monday’s drop. But the September 15 repayment deadline turns a sentiment story into a cash-flow one almost immediately, and it is the number to watch next rather than the IPO delay itself.
Reporting by Blockonomi, published September 14, 2026, citing Bloomberg for the credit facility and original loan target figures.
