SoftBank Plans $11 Billion Junk Bond Sale to Fund OpenAI Stake

Massive Debt Raise for AI Bet

SoftBank Group is seeking to raise more than $11 billion through a junk bond offering, earmarking the proceeds to finance its stake in OpenAI. The Tokyo-based conglomerate's move represents one of the largest high-yield debt issuances by an Asian corporation in recent years, underscoring chairman Masayoshi Son's renewed appetite for large-scale artificial intelligence investments.

The financing push comes as SoftBank positions itself deeper into the generative AI sector, following a period of relative caution after the Vision Fund's bruising losses in 2022 and 2023. OpenAI, the developer behind ChatGPT, has emerged as a focal point for global capital seeking exposure to frontier AI models, with its latest funding rounds valuing the San Francisco company north of $80 billion.

SoftBank has not disclosed the exact size or timing of the bond sale, but market participants briefed on the planning suggest the offering could exceed $11 billion, making it a landmark transaction in Asia's high-yield universe. The bonds would carry sub-investment-grade ratings, reflecting SoftBank's existing credit profile and the elevated risk appetite required from buyers.

Credit Market Context

The junk bond market in Asia has seen subdued activity in 2026, with issuance volumes down roughly 18 per cent year-on-year through August, according to data from regional debt capital markets. Risk premiums have widened as investors demand higher yields amid geopolitical uncertainty and concerns over China's property sector spillover effects.

SoftBank's offering would test investor demand at a time when corporate borrowers across the region have postponed or scaled back funding plans. The conglomerate last tapped the high-yield market in 2024 with a $4.5 billion multi-tranche deal, which priced at spreads ranging from 375 to 450 basis points over benchmark rates.

Proceeds from the new bond sale are intended specifically for SoftBank's OpenAI investment, adding to the group's existing portfolio of AI-related holdings that include semiconductor design firm Arm Holdings and various Vision Fund stakes in machine learning infrastructure companies. The structure allows SoftBank to maintain liquidity without diluting equity or liquidating profitable positions in other portfolio assets.

Son's AI Conviction

Masayoshi Son has repeatedly signalled that artificial intelligence represents the next transformational wave for SoftBank's investment strategy. Speaking at the SoftBank World forum in Tokyo in July, he described generative AI as an opportunity comparable to the mobile internet revolution of the 2000s, when SoftBank secured early stakes in Alibaba and Yahoo Japan.

OpenAI's partnership with Microsoft, which has invested over $13 billion in the company, has provided the startup with vast cloud computing resources and enterprise distribution channels. SoftBank's entry adds another major backer with deep pockets and a track record of patient capital, though the group's history includes high-profile misfires such as WeWork and a series of unprofitable Vision Fund bets.

The bond offering also reflects SoftBank's preference for leveraging its balance sheet to pursue outsized returns rather than relying solely on fund commitments from limited partners. The approach carries execution risk, particularly if AI monetisation timelines extend longer than current market expectations or if OpenAI faces regulatory headwinds in key jurisdictions.

What Comes Next

Market observers will watch how the bond prices and whether SoftBank achieves the full target size. A successful sale would provide the conglomerate with substantial dry powder for follow-on investments as OpenAI scales its model training infrastructure and pursues new product lines beyond conversational AI.

Credit rating agencies have flagged SoftBank's leverage levels as a monitoring point, with any significant deterioration in operating cash flow or asset valuations likely to trigger reviews. The junk bond sale adds to the group's debt load, though management has historically demonstrated willingness to divest assets to manage liquidity during stress periods.

The transaction is expected to launch in the coming weeks, subject to market conditions and final credit committee approvals from underwriting banks. If completed, it would rank among the top five high-yield offerings in Asia for 2026 and cement SoftBank's position as one of the most aggressive institutional backers of the current AI investment cycle.