SoftBank completes its final $10B tranche into OpenAI, closing out the $30B commitment

SoftBank announced on October 1 that its Vision Fund 2 made the third and final $10B investment in OpenAI, completing the full $30B commitment. After the investment, SoftBank expects to hold about 13% of OpenAI.

Facts

• Structure: the third $10B tranche went in via SoftBank Vision Fund 2, completing the $30B commitment; post-money SoftBank expects an ~13% stake.
• Funding: SoftBank financed the investment with bonds — per Reuters, the largest corporate high-yield bond issuance to date.
• Next round: per Bloomberg, OpenAI is in talks to raise another $30B or more.

Editorial take

One institution concentrating $30B of borrowed money in a private company has no precedent in tech — the bond costs and OpenAI’s valuation curve are now mutually locked: SoftBank is betting OpenAI’s revenue growth covers its debt service, while OpenAI gets the most expensive but also the most patient capital. Set it next to the expanded AWS partnership and the reported next round above $30B: compute spend, revenue growth and fundraising cadence are the three curves to watch each quarter.

The money trail

• Bond scale: per Reuters, this is the largest corporate high-yield bond issuance to date — SoftBank is using the bond market to fund a single venture bet, a first even for SoftBank.
• Stake math: the ~13% figure is SoftBank’s own post-deal estimate; the official number waits on regulatory filings.
• Vision Fund 2’s role: all three tranches ran through Vision Fund 2, meaning LPs — not the group balance sheet alone — carry the volatility, though bond funding pierces that insulation.

Our take

One institution concentrating $30B of borrowed money in a private company has no precedent in tech — the bond costs and OpenAI’s valuation curve are now mutually locked: SoftBank is betting OpenAI’s revenue growth covers its debt service, while OpenAI gets the most expensive but also the most patient capital. Set it next to the expanded AWS partnership: compute spend, revenue growth and fundraising cadence are the three curves to watch each quarter.

What to watch

• The valuation on OpenAI’s next round (Bloomberg reports talks above $30B).
• The secondary spread on SoftBank’s bonds — a live market vote on OpenAI’s revenue curve.
• How SoftBank accounts for its ~13% (equity method vs fair value) — it will amplify OpenAI valuation swings in SoftBank’s own reporting.

Timeline and context

• Commitment cadence: SoftBank announced the first $10B in April 2025, with the remaining two tranches arriving in steps — all $30B through Vision Fund 2 rather than direct group holdings.
• Bond context: Reuters calls this the largest high-yield corporate issuance to date, landing about a week after Bloomberg reported OpenAI weighing another round above $30B.
• Comparison: Anthropic’s prospectus disclosed the SpaceX compute deals — a similar structure of massive capital binding a single supplier; both leading labs now carry infrastructure-company balance sheets.

By the numbers

• $30B: SoftBank’s total OpenAI commitment, all executed through Vision Fund 2.
• ~13%: SoftBank’s estimated post-deal stake, pending regulatory filings.
• 3 tranches of $10B each: from April 2025, completed October 1, 2026.
• $30B+: the floor of OpenAI’s next-round talks per Bloomberg.

The structure also matters for OpenAI’s other creditors: with SoftBank’s stake locked at roughly 13% via a fund vehicle, future rounds have a reference price but also a large, leveraged holder whose own cost of capital rises with rates. Anyone modeling OpenAI’s cap table should now include SoftBank’s bond coupons as part of the company’s effective cost of capital.

Vision Fund 2’s LP roll includes Middle Eastern sovereign funds and European pensions, so the ultimate risk-bearers of this $30B are more dispersed — and harder to price in public markets — than the SoftBank name suggests. Tracking the fund’s quarterly OpenAI valuation marks is the cleanest window into private-AI mark-to-market cadence.