On October 1, 2026, SoftBank Group announced that it had made the third and final tranche of its previously announced $30.0 billion follow-on investment in OpenAI. The final tranche was $10.0 billion (1,579.6 billion yen). SoftBank says its cumulative investment in OpenAI now stands at $64.6 billion, giving it an ownership stake of approximately 13 percent.
SoftBank funded the tranche with proceeds from foreign-currency senior notes it announced on September 24, 2026. In the same release it said it had cancelled the remaining $10.0 billion of undrawn capacity under a bridge loan facility signed in March 2026, and that all borrowings under that facility had been repaid.
The payment closes out the follow-on SoftBank committed to earlier in the year and confirms it as one of OpenAI’s largest outside shareholders. The bridge-loan cancellation also signals that SoftBank has moved the financing of this stake from short-term bank debt to longer-dated bonds.
Why it matters: a single investor putting more than $60 billion into one AI developer, financed partly with debt, shows how far frontier-lab funding has moved from ordinary venture capital toward balance-sheet bets by conglomerates. What it does not show: the release gives no valuation for this tranche, no share terms, and nothing about OpenAI’s finances; the 13 percent figure is SoftBank’s own approximation, and press reports of a further OpenAI raise are not part of this announcement.