Shares of SoftBank slid 6% over two sessions to $19.71 after reports surfaced that the conglomerate struggled to line up a $6 billion margin loan — a loan backed by the value of an investment rather than cash — using its stake in OpenAI as collateral, reigniting fears about how far debt can safely stretch to fund the AI boom. SoftBank's $6 Billion Loan Snag Exposes a Hard Question: Can You Borrow Against an AI Bet You Don't Fully Control?
Shares of SoftBank slid 6% to $19.71 after reports surfaced that lenders balked at a $6 billion margin loan — borrowing backed by the value of an investment — collateralized by the firm's OpenAI stake. The episode lays bare a tension at the heart of the AI spending boom: even the most sought-after assets can be nearly impossible to pledge as collateral if no public market exists to price them.
• Lenders Couldn't Get Comfortable Valuing a Private Company
SoftBank initially targeted $10 billion for the margin loan back in May 2026, a figure that was slashed by 40% as lender appetite cooled.
The firm had lined up roughly $5 billion in commitments before the pause , but banks ultimately could not close. OpenAI is not publicly traded, meaning there is no liquid market to establish a consensus valuation — and lenders want collateral they can price in real time and liquidate quickly. For shareholders, this means SoftBank's single largest asset is functionally locked up as a financing tool until OpenAI lists publicly.
• A $40 Billion Bill Is Coming Due in Nine Months
Looming behind this stalled loan is a $40 billion bridge financing that supported SoftBank's OpenAI investments, which must be repaid by March 2027.
S&P Global has already cut SoftBank's credit outlook to negative. The margin loan was designed to provide liquidity without selling the prized OpenAI position; its failure narrows the runway and raises the odds of dilutive alternatives like bond issuance or asset sales.
• The Sheer Size of the OpenAI Bet Invites Concentration Risk
SoftBank's cumulative investment in OpenAI is expected to total $64.6 billion, representing roughly 13% ownership.
Arm and OpenAI collectively represent nearly 70% of SoftBank's valuation.
Recent advances by rival Anthropic have prompted some investors — and reportedly some SoftBank officials — to question the scale of the commitment. A single-name bet this large means any crack in OpenAI's competitive standing ripples directly into SoftBank's share price.
• An OpenAI IPO Could Fix Everything — or Arrive Too Late
OpenAI has filed confidentially for a U.S. IPO and is working with Goldman Sachs and Morgan Stanley on a listing potentially as soon as this fall. A public listing would create the transparent pricing lenders need, potentially reviving the margin loan. But the gap between now and a successful offering is exactly where the risk lives: "Before the dawn of OpenAI's IPO, the market is under no obligation to stand by SoftBank and bear the same risks."