SoftBank’s $11 Billion OpenAI Bond Plan Draws Heavy Early Demand

SoftBank’s junk-bond offering drew more than $20 billion of early investor interest, according to Bloomberg’s September 22 report. [1] The group plans to borrow more than $11 billion through risky bonds to fund another payment for its OpenAI stake, according to investor documents cited by the Financial Times. [2]

SoftBank announced the start of sales for $10 billion and €1 billion, or about $1.15 billion, of unsecured bonds intended for investment in OpenAI. [6] Other reports described the planned offering as $10 billion plus €1 billion, or approximately 15.3 trillion won and Rp198 trillion in local-currency terms. [3][7][8][10]

The dollar-denominated portion is divided into three maturities of three and a half years, five and a half years, and seven and a half years. [6] The bonds are expected to carry sub-investment-grade ratings, reflecting SoftBank’s credit profile and the higher risk required of buyers. [4]

Junk bonds pay high interest but carry a greater risk that investors will not recover their money. [2] The sale is set to be the largest by a single company excluding distressed debt exchanges involving companies at risk of default. [3]

The proceeds are earmarked for SoftBank’s OpenAI investment, with the planned financing described as another payment toward the group’s stake. [2][4] OpenAI develops ChatGPT, and its latest funding rounds valued the San Francisco company at more than $80 billion, according to Brief Asia. [4]

SoftBank’s existing AI-related holdings include semiconductor designer Arm Holdings and Vision Fund stakes in machine-learning infrastructure companies. [4] The group is also sharply increasing the limit on a margin loan backed by Arm shares as its reliance on borrowing grows. [3]

Asian junk-bond issuance was down roughly 18% year over year through August 2026, while risk premiums had widened amid geopolitical uncertainty and concerns about spillovers from China’s property sector. [4] SoftBank last entered the high-yield market in 2024 with a $4.5 billion multi-tranche transaction priced at spreads of 375 to 450 basis points over benchmark rates. [4]

The new structure lets SoftBank preserve liquidity without issuing equity or liquidating other strategic holdings, according to Brief Asia. [4] Nvidia also plans to issue at least $20 billion of bonds to help finance continuing AI spending, according to a related report cited by Prospect. [6]

SoftBank is pairing a concentrated OpenAI position with several forms of borrowing: unsecured junk bonds and a larger lending facility backed by Arm shares. Early interest exceeding the planned offering suggests investors are willing to evaluate that exposure despite the bonds’ speculative-grade status and a subdued Asian high-yield market. Nvidia’s reported plan for at least $20 billion of bonds provides a useful comparison: both companies are turning to debt as they direct capital toward AI, although SoftBank’s proceeds are specifically tied to OpenAI. For technology leaders, the transaction shows that frontier-model financing now intersects directly with corporate credit strategy. What the sources don't address: what returns, governance rights or protections SoftBank expects from the OpenAI stake financed by this debt.