SoftBank Launches Record Junk-Bond Sale to Fund Its OpenAI Stake
The Japanese group is marketing one of the largest corporate high-yield deals ever, at yields reported up to 9.875%.
Assembled by Claude from 8 sources at 8 outlets · Wednesday, September 23, 2026, Evening edition, 5:20 PM EDT · no human byline
What happened
SoftBank Group began marketing an $11 billion high-yield bond offering to support its artificial intelligence growth plans seekingalpha.com. A term sheet showed the company taking orders for $10 billion in bonds to fund its OpenAI investment, a deal that would rank among the third-largest global high-yield bond deals on record according to LSEG data, with the bonds expected to be rated BB+ by S&P arabnews.jp. TradingView carried the same $11 billion figure tradingview.com.
Bloomberg reported that Masayoshi Son's SoftBank kicked off what is set to be one of the largest corporate junk bond sales ever finance.yahoo.com, offering record yields on the jumbo notes theedgemalaysia.com. Seoul Economic Daily reported the sale drew $20 billion in demand at yields up to 9.875% en.sedaily.com. Insider Monkey reported that SoftBank is raising $11 billion for OpenAI and that its Arm Holdings stake backs a $25 billion loan facility insidermonkey.com.
Why it matters to investors
The price of the deal is the signal. MarketWatch described the mega junk-bond deal as showing that capital for the AI race is getting more expensive, while cautioning that nothing is set in stone until the bonds actually price marketwatch.com. A deal of that size would be one of the largest of its kind to hit the US high-yield market marketwatch.com.
The structure matters too. SoftBank is turning its public-market assets into funding for the OpenAI bet, with the Arm stake standing behind a separate $25 billion facility insidermonkey.com. Son has played down concerns surrounding AI infrastructure even as the group expands its OpenAI investment en.sedaily.com.
What to watch
Final pricing is the first test, and MarketWatch's caveat that nothing is fixed until the bonds price still applies marketwatch.com. The $20 billion order book reported against a $10 billion to $11 billion deal gives one measure of appetite en.sedaily.comarabnews.jp.
The rating is the second marker, with S&P expected to assign BB+, the top rung of speculative grade arabnews.jp. The third is whether other AI borrowers follow, since this sale is being read as a gauge of what leverage the high-yield market will extend to the buildout marketwatch.com. Bloomberg's record-yield framing sets the benchmark others would have to beat theedgemalaysia.com. A fourth thread is SoftBank's own funding stack, which now pairs the bond sale with a facility secured on its Arm Holdings shareholding insidermonkey.com. Seeking Alpha described the offering as supporting AI growth rather than refinancing existing debt seekingalpha.com, and the term sheet ties the proceeds to the OpenAI investment specifically arabnews.jp.
Sources
- marketwatch.com: Softbank's mega junk- bond deal shows capital for the AI race is getting more expensive (2026-09-23)
- seekingalpha.com: SoftBank markets $11B high-yield bond offering to support AI growth - Seeking Alpha (2026-09-23)
- arabnews.jp: SoftBank takes orders for $10 billion in bonds to fund OpenAI investment, term sheet shows (2026-09-23)
- finance.yahoo.com: SoftBank Starts Jumbo High-Yield Bond Sale to Finance AI Push (2026-09-23)
- en.sedaily.com: SoftBank Junk Bond Draws $20 Billion in Demand at Yields Up to 9.875% (2026-09-23)
- theedgemalaysia.com: SoftBank offers record yields on jumbo junk bonds in AI push — Bloomberg (2026-09-23)
- insidermonkey.com: SoftBank Is Raising $11 Billion for OpenAI. Its Arm Stake Backs a $25 Billion Loan Facility (2026-09-23)
- tradingview.com: SoftBank markets $11B high-yield bond offering to support AI growth - TradingView (2026-09-23)