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SoftBank borrows to fund its OpenAI stake

SoftBank borrows to fund its OpenAI stake

Money Moves
By Newzino Staff |

Masayoshi Son leverages a $64 billion AI bet through margin loans, bridge facilities, and bond sales

Today: SoftBank seeks $10B margin loan against OpenAI shares

Overview

SoftBank Group is in talks to borrow $10 billion against its shares in OpenAI, the latest in a chain of debt deals that have funded one of the largest concentrated bets in modern corporate history. The two-year margin loan, reported by Bloomberg on April 23, 2026, would carry an interest rate of roughly 7.88% and sit on top of a $40 billion bridge facility SoftBank arranged just weeks earlier.

Why it matters

If OpenAI's private valuation slips, margin calls could force SoftBank into asset sales that ripple through tech stocks, Japanese banks, and AI infrastructure spending worldwide.

Key Indicators

$10B
New margin loan sought
Two-year facility backed by OpenAI shares, with an option to extend a third year.
$64.6B
SoftBank's OpenAI commitment
Cumulative investment after the February 2026 follow-on, making OpenAI SoftBank's largest single bet.
13%
Expected stake in OpenAI
SoftBank's ownership share once the latest commitments are fully funded.
7.88%
Indicative loan rate
Roughly 425 basis points over SOFR, the U.S. dollar lending benchmark.
$852B
OpenAI valuation
Set in March 2026 after a $122 billion funding round led by Amazon, Nvidia, and SoftBank.
360 bps
SoftBank credit-default swaps
Cost to insure SoftBank debt against default, near a one-year high.

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People Involved

Masayoshi Son
Masayoshi Son
Driving SoftBank's debt-financed expansion of its OpenAI stake
 Sam Altman
Sam Altman
Leading OpenAI through its largest fundraising and infrastructure expansion

Organizations Involved

SoftBank Group Corp.
SoftBank Group Corp.
Japanese investment holding company
Borrowing against multiple assets to fund OpenAI commitments

Tokyo-listed conglomerate whose largest holdings include OpenAI, Arm Holdings, and stakes across the Vision Fund portfolio.
OpenAI
OpenAI
Private artificial intelligence company
Collateral for SoftBank's proposed margin loan

Maker of ChatGPT, valued at $852 billion in March 2026 and SoftBank's single largest investment exposure.
Stargate LLC
Stargate LLC
AI infrastructure joint venture
Vehicle for the broader U.S. AI buildout SoftBank is financing alongside OpenAI

Joint venture announced January 2025 to invest up to $500 billion over four years in U.S. AI data centers.

Timeline

  1. SoftBank seeks $10B margin loan against OpenAI shares

    Financing

    Bloomberg reports a two-year facility at roughly 425 basis points over SOFR. SoftBank credit-default swaps widen about 10 basis points.

  2. Lead banks invite more lenders into $40B loan

    Financing

    Underwriters look to syndicate the bridge facility, an early test of broader creditor appetite for SoftBank's OpenAI exposure.

  3. OpenAI closes $122B round at $852B valuation

    Valuation

    Amazon commits $50 billion, Nvidia and SoftBank $30 billion each, setting the price reference for SoftBank's collateral.

  4. $40 billion bridge loan signed

    Financing

    JPMorgan, Goldman Sachs, Mizuho, SMBC, and MUFG underwrite SoftBank's largest dollar lending facility, maturing March 2027.

  5. SoftBank announces additional $30B follow-on

    Investment

    Cumulative commitment to OpenAI rises to roughly $64.6 billion, expected ownership of about 13%.

  6. SoftBank completes initial $40B commitment

    Funding

    Final tranche of about $22.5 billion arrives at OpenAI, after Son sells SoftBank's entire Nvidia stake and part of its T-Mobile holding to fund it.

  7. OpenAI secondary sale at $500B

    Valuation

    Employee secondary tender prices OpenAI at $500 billion, marking up SoftBank's stake on paper.

  8. SoftBank leads $40 billion OpenAI round

    Investment

    OpenAI raises a record private financing at a $300 billion pre-money valuation, with SoftBank as lead investor.

  9. Stargate announced at the White House

    Strategic Announcement

    SoftBank, OpenAI, and Oracle unveil a $500 billion AI infrastructure venture, with Son as chairman and SoftBank holding financial responsibility.

Scenarios

1

OpenAI IPO unlocks SoftBank's bet

Discussed by: TechCrunch, Asia Business Outlook

OpenAI files for a public listing within 12 to 18 months. A successful IPO converts SoftBank's private holding into a marketable security, eases collateral concerns, and lets SoftBank refinance the bridge and margin loans against publicly traded stock at lower rates. This is the scenario lenders appear to be pricing into the current loan terms.

2

OpenAI valuation slips, margin calls cascade

Discussed by: Bloomberg credit desks, Om Malik, FinTech Weekly

A drop in OpenAI's secondary-market price or in the next funding round triggers collateral calls under the margin loan. SoftBank would be forced to post additional Arm or other shares, or to sell holdings into a falling market. With credit-default swaps already near a one-year high, a stress event could compound borrowing costs across SoftBank's outstanding debt.

3

AI capex slowdown forces SoftBank retreat

Discussed by: TradingKey, Nikkei Asia

Hyperscaler AI spending plateaus and OpenAI revenue growth disappoints. SoftBank cannot execute the IPO exit, faces credit downgrades, and is forced to scale back the Stargate buildout. Son's 'all-in' bet becomes the defining test of whether AI infrastructure can sustain the leverage that has been used to build it.

4

Loan closes uneventfully, debt stack expands

Discussed by: Reuters, Yahoo Finance

Banks finalize the margin loan on roughly the indicated terms. SoftBank uses the proceeds for general corporate purposes and continued OpenAI funding, while pursuing further debt issuance through 2026. Markets treat the deal as part of an established pattern, and attention shifts to the next round of bond sales.

Historical Context

SoftBank's $8B Alibaba margin loan (2017)

April 2017

What Happened

SoftBank pledged part of its Alibaba stake as collateral for an $8 billion margin loan from a syndicate of banks at LIBOR plus 150 basis points. It was one of the largest margin loans ever and established the template SoftBank still uses: borrow against marketable holdings rather than sell them.

Outcome

Short Term

SoftBank gained liquidity for Vision Fund and other investments without realizing capital gains taxes on Alibaba.

Long Term

The structure became a recurring tool, later replicated against Arm Holdings shares with $11.5 billion of margin loan capacity by 2025.

Why It's Relevant Today

The OpenAI margin loan extends the same playbook to a private company, where the collateral cannot be marked to a public market price. That is the structural difference making the new deal riskier.

Vision Fund's WeWork bet (2019)

August-November 2019

What Happened

SoftBank had invested over $10 billion in WeWork ahead of a planned IPO. The S-1 filing exposed governance and financial concerns, the IPO was pulled, and WeWork's valuation fell from $47 billion to under $8 billion. SoftBank was forced to lead a $9.5 billion rescue and write down billions more.

Outcome

Short Term

SoftBank booked a $4.6 billion loss on the WeWork stake in fiscal 2019 and ousted founder Adam Neumann.

Long Term

Vision Fund 2 raised far less external capital than planned, and SoftBank entered a multi-year period of debt reduction before pivoting back to aggressive AI investment.

Why It's Relevant Today

Demonstrates how fast a private valuation can collapse when public-market scrutiny arrives. SoftBank's OpenAI position is several times larger than its WeWork exposure.

Long-Term Capital Management collapse (1998)

August-September 1998

What Happened

The hedge fund LTCM held positions worth more than $1 trillion against $4.7 billion of capital, financed by margin loans from major banks. When Russia defaulted on its debt, LTCM's collateral fell sharply, triggering margin calls it could not meet. The Federal Reserve organized a $3.6 billion bank-led rescue.

Outcome

Short Term

Fourteen banks took over LTCM's portfolio to wind it down without forced sales that could have damaged broader markets.

Long Term

Established that highly leveraged positions in correlated assets create systemic risk even when the underlying trades look sound. Influenced bank capital rules and counterparty risk management for decades.

Why It's Relevant Today

Cautionary template for what happens when concentrated, levered exposure to a single thesis encounters a sudden mark-to-market shock. SoftBank's exposure is concentrated in one private company rather than thousands of correlated trades, but the leverage dynamic is similar.

Sources

(12)
+6
Bloomberg The Japan Times Invezz BanklessTimes SoftBank Group Corp. CNBC OpenAI Om Malik Bloomberg Bloomberg The Japan Times OpenAI