SoftBank Raises $10 Billion in Bond Offering to Finance OpenAI Stake

Dual-Currency Structure

SoftBank Group has launched a bond offering worth over $10 billion to finance its ongoing investment in OpenAI, according to term sheet documents circulated on Monday. The issuance comprises $10 billion in dollar-denominated senior unsecured notes and an additional €1.0 billion tranche, structured across five separate maturity profiles.

The dollar portion splits into three tenors: 3.5 years, 5.5 years, and 7.5 years. The euro-denominated bonds offer 4-year and 6-year maturities. Citigroup and JPMorgan are serving as lead bookrunners for the transaction.

Pricing is scheduled for 24 September, with settlement expected on 29 September, five days ahead of the investment closing date.

Third Tranche Funding

The proceeds will fund SoftBank's $10 billion payment for the third tranche of its follow-on investment in OpenAI, which is set to close on 1 October. The term sheet indicates that a portion of the raised capital will also be allocated to general corporate purposes.

SoftBank had previously secured a $10 billion bridge loan facility to support the OpenAI investment. The bond issuance will cancel that interim financing arrangement, converting short-term debt into longer-term capital market instruments with staggered maturities.

The timing reflects SoftBank's strategy to lock in funding ahead of the investment deadline whilst accessing public debt markets under current conditions. By replacing the bridge facility with bonds, the Tokyo-based conglomerate extends its repayment timeline and diversifies its creditor base beyond the banking syndicate.

Strategic Context

SoftBank's escalating commitment to OpenAI represents one of the largest single-entity bets on artificial intelligence infrastructure in Asia. The company has positioned itself as a major backer of the San Francisco-based AI developer, whose ChatGPT platform has driven a wave of enterprise adoption and venture investment across the sector.

The multi-tranche structure allows SoftBank to match debt maturity with expected cash flow profiles whilst tapping both US and European investor demand. Senior unsecured notes rank above subordinated debt but below secured obligations in the capital structure, offering a middle ground between cost and investor appetite.

The transaction also underscores the willingness of fixed-income investors to finance large-scale technology bets through corporate debt, even as questions around AI monetisation timelines persist. SoftBank's ability to raise this quantum in public markets, rather than relying solely on bank financing, signals continued confidence in its creditworthiness despite its concentration risk in the AI sector.

OpenAI has been raising capital at a rapid pace, with multiple funding rounds attracting participation from technology giants and institutional investors. SoftBank's structured approach to financing its stake contrasts with equity-only participants, reflecting the conglomerate's need to manage leverage whilst maintaining exposure to high-growth assets.

The bond sale arrives as Asian conglomerates increasingly turn to capital markets to fund technology investments, particularly in artificial intelligence and semiconductor infrastructure. SoftBank's move may set a precedent for how regional investors finance participation in US-based AI leaders without diluting existing equity positions.

With settlement scheduled just ahead of the 1 October closing, SoftBank is compressing the timeline between fundraising and deployment, minimising the period during which it holds unallocated capital. This precision reflects both market conditions and the firm's urgency to secure its position in OpenAI's cap table before the window closes.