SoftBank Group completed an $11.1 billion high-yield bond issuance across dollar and euro tranches on September 24, the largest corporate junk-bond sale in global history. The proceeds are designated for the company's OpenAI equity commitment, a stake that reportedly values the AI developer north of $150 billion in its latest funding round. SoftBank shares rose 7.2% in Tokyo trading following the announcement.
The issuance surpasses the previous record set by Verizon Communications in 2013, when the telecom raised $49 billion across investment-grade tranches to acquire Vodafone's wireless stake. SoftBank's all-high-yield structure reflects the company's BB+ credit rating from S&P, one notch below investment grade. The deal was oversubscribed by institutional buyers in Europe and Asia, with the euro tranche reportedly pricing at 425 basis points over mid-swaps and the dollar portion at 450 basis points over Treasuries. Lead underwriters included Goldman Sachs, JPMorgan, and Mizuho.
The move consolidates Masayoshi Son's positioning in the generative AI value chain. OpenAI's current funding round, expected to close in October, would bring total capital raised to approximately $13.6 billion since inception. SoftBank's allocation, combined with its existing $500 million stake from a 2019 tender offer, positions the Vision Fund parent as one of the developer's three largest non-Microsoft shareholders. Son has publicly stated his intention to deploy $100 billion into AI infrastructure over the next decade, a figure that includes both direct equity and debt facilities for compute buildouts.
The bond structure carries refinancing exposure. SoftBank's outstanding debt load now exceeds $150 billion when including lease obligations and Vision Fund liabilities. Approximately $18 billion in dollar-denominated notes mature between Q2 2026 and Q4 2027, a window that coincides with the Federal Reserve's expected terminal rate environment. The company's loan-to-value ratio on its Alibaba stake—its largest liquid asset—sits near 35%, approaching internal thresholds that historically trigger margin calls or forced asset sales. If OpenAI delays a liquidity event past 2027, SoftBank may face a choice between selling public holdings or negotiating covenant relief with bondholders.
Operators should monitor three catalysts. First, OpenAI's October funding close and any disclosed revenue multiples, which will set the mark-to-market for SoftBank's $1.5 billion reported commitment. Second, the Vision Fund 2's Q4 distribution schedule, as Son has previously used fund-level liquidity to service parent-company debt. Third, any filings related to Alibaba share pledges in Hong Kong, where the company has historically accessed margin facilities against its $60 billion stake. The combination of rising Treasury yields and compressed AI equity multiples would compress the available cushion in those arrangements.
SoftBank now holds the distinction of issuing the largest high-yield corporate bond in history to fund a minority stake in a private company with no disclosed EBITDA.