Shares of SoftBank rebounded sharply on September 15, clawing back most of the prior session's AI-sector selloff, as two major financing moves gave investors a reason to buy the dip. The twin catalysts — a subsidiary IPO filing and a landmark debt repayment — address the single biggest worry hanging over the stock: whether SoftBank can actually fund its sprawling AI empire without buckling under leverage.
Paying Off a $25.9 Billion Bridge Loan Buys Credibility, Not Safety
SoftBank is repaying the full $25.9 billion outstanding balance on a $40 billion bridge loan — its largest-ever dollar borrowing — originally taken to finance its OpenAI investment, with the payoff due today, September 15.
The repayment comes months ahead of the loan's March 2027 maturity, as SoftBank shifts toward longer-term debt. That's reassuring, but the money has to come from somewhere. Throughout 2026, SoftBank has mobilized roughly $25 billion via bond markets and margin loans, and is pursuing an additional $10 billion credit facility — including a $10 billion margin loan collateralized by its OpenAI stake. In short, SoftBank is replacing short-term debt with longer-term debt, not with earnings.
SB Energy's IPO Promises a Cash Injection — But the Numbers Are Sobering
SB Energy is targeting a raise of $5–$7 billion at a valuation of roughly $50 billion.
Yet the subsidiary posted a net loss of $7.01 billion on just $268.84 million in revenue for the twelve months ended June 30, and none of its data center capacity is currently in operation.
Nvidia has committed $1.5 billion in a private placement at the IPO price, and OpenAI holds warrants worth roughly $5.5 billion. Cornerstone backers add credibility, but the company's own prospectus warns it is "substantially dependent" on OpenAI as its primary customer.
The Real Risk: $50 Billion in AI-Linked Borrowing Against One Private Stake
Stacking two margin loans atop the bridge financing pushes SoftBank's OpenAI-linked borrowing past $50 billion for 2026 alone — a scale of leverage against a single, illiquid private-company stake with few direct comparisons.
OpenAI's last marked valuation was $852 billion, set privately and not testable in public markets. If that valuation slips, margin calls could force SoftBank to post additional cash at the worst possible time.
Bottom Line: Today's bounce reflects genuine progress on balance-sheet cleanup and asset monetization. But SoftBank's AI bet still rests on a tower of borrowed money, an un-revenue'd subsidiary seeking a $50 billion valuation, and a private-market price tag on OpenAI that no public buyer has yet validated.