SoftBank pays its final $10 billion into OpenAI with bond money, taking its total to $64.6 billion
SoftBank paid the last $10 billion of its OpenAI commitment on October 1, taking its total to $64.6 billion for about 13% of the company. It funded the payment with new senior notes, so a stake worth roughly $110 billion at February's price is now carried on bond debt.
The Investor · Invest desk
What happened
- SoftBank canceled the unused $10 billion of its $40 billion bridge facility on September 30 and says all borrowings under it have been repaid.
- Nvidia's $30 billion February contribution stands, but it did not finalize an extra $10 billion tranche in October, Crypto Briefing reported.
- Amazon committed $50 billion to the same round, with portions contingent on OpenAI hitting milestones.
Why it matters
- Who's exposed exposure OpenAI's valuation would have to fall about 41% from the February post-money before SoftBank's 13% is worth less than the $64.6 billion it paid.
- What it costs cost Every $10 billion change in OpenAI's valuation moves SoftBank's paper position by about $1.3 billion, while the notes that paid for the last tranche must be serviced regardless.
- What it limits constraint With no undrawn bridge commitments left, any further SoftBank money for OpenAI would need fresh financing.
- What doesn't add up contradiction A post on X saying Nvidia matched SoftBank's $10 billion overstates Nvidia's reported OpenAI exposure by that full $10 billion.
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Taken at face value, SoftBank's bridge disclosure means about $30 billion was drawn on the $40 billion line [11]. SoftBank's own list of disclosures describes that facility as signed primarily for the OpenAI follow-on [9]. All of that borrowing has since been repaid [7]. The last $10 billion of equity came from foreign currency-denominated senior notes announced on September 24 [5], so the position now rests on bonds. The supplied disclosures do not include the notes' size, coupon or maturity.
Before the February commitment, SoftBank already had roughly $34.6 billion in OpenAI: the $64.6 billion total less the $30 billion follow-on [15] [2]. The follow-on was paid over six months, in tranches dated April 1, July 1 and October 1 [4] [1].
Multiply 13% by the February post-money of about $840 billion to $852 billion [8] and you get $109 billion to $111 billion [12], some $45 billion above SoftBank's $64.6 billion cost [13]. Divide the cost by 0.13 and the break-even OpenAI valuation comes out near $497 billion [16]. Both inputs are soft. The 13% is SoftBank's approximation [3], and the post-money is a range Crypto Briefing reported for a round of $110 billion to $122 billion at a pre-money near $730 billion [8].
If the next round prices at or above February's level, the mark holds. Crypto Briefing lists whether that valuation survives any future fundraising as an open question [21]. A lower round that still clears $497 billion leaves SoftBank above cost, with less room. The third path runs through Amazon, whose $50 billion includes portions contingent on milestones [10]. Crypto Briefing says OpenAI is putting the round's proceeds into compute and data centers [22], and part of that money is conditional.
I think the weaker side of SoftBank's position is the liability. The stake gets a new price only when OpenAI raises again. The notes have to be serviced whatever that price turns out to be. This view is wrong if the notes turn out to be long-dated and cheap and the next round prices above $852 billion. In that case the debt is a small cost against a larger asset.
Nvidia did not add to its February check, according to Crypto Briefing. It reported that an extra $10 billion tranche some had expected in October was not finalized [19]. SoftBank's $64.6 billion is about 2.15 times Nvidia's reported $30 billion contribution [14].
What to watch
- The size, coupon and maturity of SoftBank's September 24 foreign-currency senior notes, the cost of carrying the OpenAI stake.
- OpenAI's next fundraising price against the $840 billion to $852 billion February post-money and SoftBank's break-even near $497 billion.
- How much of Amazon's milestone-linked $50 billion is actually released to OpenAI.
Information, not investment advice. This story is general information about companies and markets, drawn from cited reporting. It is not a recommendation to buy, sell or hold any security; check the cited sources before acting.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence85
- Adoption
- Not scored
- Hype gap+10
- Incentives50
- Confidence80
Perspective Coverage
6 publishers- Builder
- Builder 6%
- Operator
- Operator 17%
- Investor
- Investor 77%
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
On October 1, 2026 (Japan time), SoftBank Group executed the third and final tranche of its follow-on investment in OpenAI via SoftBank Vision Fund 2, in the amount of USD 10.0 billion.
- [2]
Following the third tranche, SoftBank completed the USD 30.0 billion follow-on investments in OpenAI announced on February 27, 2026.
- [3]
SoftBank's cumulative investment in OpenAI totals USD 64.6 billion and its ownership interest is approximately 13%.
- [4]
SoftBank announced execution of the first tranche of the OpenAI follow-on investment on April 1, 2026 and the second tranche on July 1, 2026.
- [5]
The third tranche was funded with proceeds from the issuance of foreign currency-denominated senior notes announced on September 24, 2026.
- [6]
Effective September 30, 2026, SoftBank canceled the remaining USD 10.0 billion of undrawn capacity under the bridge facility agreement entered into on March 27, 2026, which had a total facility amount of USD 40.0 billion.
- [7]
Following the cancellation and the early repayment announced September 9, 2026, all borrowings under the bridge facility agreement have been repaid and no undrawn commitments remain.
- [8]
In late February 2026 OpenAI raised between $110 billion and $122 billion at a pre-money valuation of approximately $730 billion, giving a post-money valuation of around $840 billion to $852 billion.
- [9]
SoftBank's March 27, 2026 bridge facility agreement was described in its disclosure titled 'Execution of Bridge Facility Agreement Primarily for the Follow-on Investments in OpenAI'.
- [10]
Amazon committed $50 billion to the February round, with portions contingent on OpenAI hitting certain milestones; Nvidia and SoftBank each injected $30 billion.
- [11]
About $30 billion of SoftBank's $40 billion bridge facility was drawn, implied by $10 billion remaining undrawn at cancellation.
- [12]
At the February post-money valuation, a 13% stake is worth about $109 billion to $111 billion.
- [13]
The implied paper value exceeds SoftBank's $64.6 billion cost by about $45 billion.
- [14]
SoftBank's $64.6 billion cumulative OpenAI investment is about 2.15 times Nvidia's reported $30 billion February contribution.
- [15]
SoftBank had about $34.6 billion invested in OpenAI before the $30 billion follow-on.
- [16]
SoftBank's 13% stake equals its $64.6 billion cost at an OpenAI valuation of about $497 billion.
- [17]
The break-even valuation is about 41% to 42% below the February post-money valuation.
- [18]
Each $10 billion change in OpenAI's valuation changes the value of SoftBank's 13% stake by about $1.3 billion.
- [19]
Nvidia contributed $30 billion to the February 2026 round but did not finalize an additional $10 billion tranche in October, despite earlier speculation that it would.
- [20]
A social media post circulating on X said Nvidia and SoftBank had each put $10 billion into OpenAI; only the SoftBank part holds up.
- [21]
Crypto Briefing lists whether the post-money valuation of around $840 billion to $852 billion holds up in any future fundraising as something to watch.
- [22]
OpenAI has put the proceeds of the round toward expanding its compute and data center capabilities.
Sources
5 independent publishers whose own reporting we read for this story.
- channelnewsasia.comSoftBank completes final phase of $30 billion investment in OpenAI
1 article · October 1, 2026
- cryptobriefing.comSoftBank closes final $10B OpenAI tranche, lifting its total to $64.6B
1 article · October 1, 2026
- economictimes.indiatimes.comSoftBank completes final phase of $30 billion investment in OpenAI - The Economic Times
1 article
- Execution of Follow-on Investment (Third Tranche) in OpenAI | SoftBank Group Corp.
group.softbank
1 article · October 1, 2026
- morningstar.comSoftBank Group Invests Additional $10 Billion in OpenAI | Morningstar
1 article · October 1, 2026
- thenextweb.comSoftBank completes $30bn OpenAI investment with final $10bn payment
1 article · October 2, 2026
Topics and entities
Topics
- High-yield bonds
- AI Financing
- Bridge financing
Entities
- OpenAI
- Nvidia
- Sam Altman
- SoftBank Vision Fund 2
- Masayoshi Son
- Amazon
- SoftBank Group Corp.