SoftBank targets over $11 billion in junk bonds to fund a $10 billion OpenAI payment

SoftBank Group is seeking to raise more than $11 billion across dollar and euro high-yield bonds, according to Bloomberg reporting, in what would rank among the largest such deals of the year. The structure splits roughly into $10 billion of dollar bonds across three tranches and about EUR 1 billion, near $1.1 billion, across two euro tranches.

The use of proceeds is unusually specific for a deal this size: the money is earmarked for SoftBank's follow-on investment in OpenAI, and in particular a $10 billion payment due on October 1. That turns the bond sale from a general funding exercise into a dated obligation, which is the detail that should shape how investors read the pricing.

The scale only registers properly against what SoftBank has already done this year. The group has sold nearly $15 billion of bonds across currencies in 2026, which makes it the largest junk-rated corporate borrower of the year on Bloomberg's own data. Adding $11 billion on top of that is a meaningful step up in leverage taken on to fund an equity stake in a private company.

What to watch is pricing and demand. If the tranches clear near talk with a well-covered book, it tells you the high-yield market is still willing to fund AI exposure at size through a leveraged holding company. If they widen, it is the clearest signal yet that appetite for this trade has a limit, and it would matter well beyond SoftBank.