SoftBank Group issued $11.1 billion in dollar- and euro-denominated bonds on September 24, the largest high-yield corporate bond sale in history. The proceeds fund the company's $500 million commitment to OpenAI's recent $6.6 billion Series C round, announced last week. Tokyo-listed shares climbed 7.1% the same day, closing at ¥10,240, a four-month high.
The offering split into $6.4 billion in dollar tranches and €4.2 billion in euro paper. The flagship 9.75% ten-year tranche priced at par, paying 390 basis points over comparable Treasuries. European allocators took 61% of the euro issuance, with sovereign wealth funds and insurance mandates absorbing the longest-dated maturities. Settlement occurs September 30. SoftBank did not tap equity markets, preserving founder Masayoshi Son's 34% voting control and avoiding further dilution to Vision Fund unit-holders.
The bond sale solves three problems at once. First, it funds the OpenAI position without liquidating Arm Holdings shares, which remain subject to a 180-day lock-up expiring in late December. Second, it avoids a drawdown from Vision Fund II, which holds $18 billion in dry powder earmarked for late-stage AI infrastructure bets. Third, it creates a liquid liability structure that can be refinanced or hedged if OpenAI pursues a public listing in the next 18-24 months, as company executives suggested in investor calls last quarter. The 9.75% coupon reflects SoftBank's BB-minus rating from Fitch, one notch below investment grade, but demand was strong enough to upsize the original $9 billion target by 23%.
Allocators should watch three events. First, whether SoftBank exercises the greenshoe option to issue an additional $1.2 billion by October 15, which would push total proceeds past $12.3 billion and create room for follow-on AI equity stakes beyond OpenAI. Second, Arm's lock-up expiry in late December: if SoftBank monetizes even 10% of its 90% stake, that adds $6-7 billion in liquidity that could either retire near-term debt or fund new Vision Fund commitments. Third, OpenAI's rumored Q1 2025 governance restructure, which may convert the nonprofit parent into a public-benefit corporation and unlock a clearer path to IPO — making SoftBank's position mark-to-market for the first time.
The bond pricing arrived tighter than comparable Indonesian sovereign debt and only 40 basis points wider than Latin American telecoms with similar ratings. That spread suggests credit markets view SoftBank's AI exposure as an asset, not a liability, despite the company's history of volatile marks in Vision Fund I.