SoftBank Launches a Record Junk Bond Sale to Fund Its OpenAI Stake

The Japanese group is taking orders for one of the largest corporate high-yield deals ever, financing artificial intelligence commitments in the junk market rather than with equity.

Assembled by Claude from 10 sources at 10 outlets · Wednesday, September 23, 2026, Morning edition, 10:21 AM EDT · no human byline

What happened

SoftBank Group kicked off what is set to be one of the largest corporate junk bond sales ever, offering record yields in its artificial intelligence push bloomberg.com. The company is taking orders for 10 billion dollars in bonds to fund its OpenAI investment, according to a term sheet zawya.com. The deal is structured in three tranches with high-yield pricing guidance stratnewsglobal.com. It was announced on 22 September gurufocus.com.

If completed at that size, it would be the largest high-yield bond sale on record by an Asia-Pacific and Japan issuer, topping SoftBank's own previous deal zawya.com. Early demand has been heavy: the group drew over 20 billion dollars of early interest in the offering japantimes.co.jp. One earlier report put the target at 11 billion dollars pressreader.com. Separately, coverage of the financing described borrowing of 100 billion dollars to fund the OpenAI investment amid high debt and valuation risks, noting that Masayoshi Son had also borrowed from banks by pledging personal SoftBank shares kucoin.com.

Why it matters to investors

The financing moves artificial intelligence build-out risk from equity holders onto credit investors. SoftBank is not alone in storming markets for funding, with global artificial intelligence-related debt rising alongside it moneycontrol.com.

That matters because the equity exit route is narrowing at the same time. Artificial intelligence-related initial public offerings are being postponed as investors grow cautious, with the first-order trades holding up but fragility emerging further down the chain among smaller deals semafor.com. SoftBank's own SB Energy is seen delaying its listing on valuation concerns asia.nikkei.com.

What to watch

Pricing is the signal, not size. The deal is being marketed at record yields, so the clearing level will show what the market charges to fund artificial intelligence capital spending through leverage bloomberg.comstratnewsglobal.com.

Watch whether the final book lands nearer the 10 billion dollar target or the larger early interest, since oversubscription at a record coupon is a different message from a struggling book zawya.comjapantimes.co.jp. Watch the collateral structure behind the parent, given reporting that Son has pledged personal shares to borrow kucoin.com. And watch the listings pipeline: if postponements spread beyond smaller deals, debt becomes the only funding channel left for the build-out, which is the condition under which credit spreads matter most semafor.comasia.nikkei.com.

Sources

1. bloomberg.com: SoftBank Offers Record Yields on Jumbo Junk Bonds in AI Push - Bloomberg (2026-09-23)
2. zawya.com: SoftBank takes orders for $10bln in bonds to fund OpenAI investment, term sheet shows (2026-09-23)
3. stratnewsglobal.com: SoftBank Bond Deal Targets $10 Billion For OpenAI - StratNews Global (2026-09-23)
4. gurufocus.com: SoftBank Launches Record High-Yield Bond Issuance to Fund AI Investments - GuruFocus (2026-09-23)
5. moneycontrol.com: SoftBank starts jumbo high-yield bond sale to finance AI push - Moneycontrol.com (2026-09-23)
6. japantimes.co.jp: SoftBank draws over $20 billion of early interest in junk bond - The Japan Times (2026-09-23)
7. pressreader.com: SoftBank eyes $11B in junk bonds | Northwest Arkansas Democrat-Gazette - PressReader (2026-09-22)
8. kucoin.com: SoftBank borrows $100 billion to fund its OpenAI investment amid high debt and valuation risks. (2026-09-23)
9. semafor.com: AI-related IPOs postponed as investors grow cautious (2026-09-22)
10. asia.nikkei.com: SoftBank -backed SB Energy seen delaying IPO on valuation concerns - Nikkei Asia (2026-09-22)