SoftBank Group Corp (SFTBY.US) executed a substantial $11.1 billion bond sale on Thursday, offering dollar and euro-denominated high-yield debt to secure fresh capital for its escalating bets on artificial intelligence. The Japanese conglomerate sold three tranches of dollar-denominated senior notes: $1 billion with a 3.5-year term, $4.5 billion with a 5.5-year term, and $4.5 billion with a 7.5-year term, carrying coupon rates of 8.625%, 9.25%, and 9.75%, respectively.

The company also issued two euro-denominated senior notes of €500 million each, with maturities of four and six years and yields of 7.125% and 8%. Proceeds from these bonds will cover the final $10 billion installment of SoftBank's committed $30 billion investment in OpenAI, the developer of ChatGPT. Once completed, SoftBank's total investment in OpenAI will reach $64.6 billion.

Market pricing on SoftBank's existing debt has deteriorated notably. Yields on its 2031 dollar bonds climbed to 8.2% earlier this month, up sharply from a January low of 6.7%, while credit default swap costs have also risen to multi-year highs. With AI investment scales expanding, rising financing expenses and uncertain asset exit timelines are simultaneously pressuring SoftBank's capital allocation strategy.

Beyond the bond issuance, SoftBank has expanded its asset-backed financing arrangements. According to sources familiar with the matter, the company increased a margin loan secured by shares of its chip unit Arm Holdings (ARM.US) by $5 billion, bringing the facility to $25 billion. Margin loans allow borrowers to use investment assets like stocks as collateral. SoftBank originally secured an $8.5 billion credit facility backed by Arm stock in 2023, which was raised to $13.5 billion in 2024 and then to $20 billion last year. As of December, SoftBank had drawn $20 billion from this facility, which matures in September 2027.

Sources indicate SoftBank renegotiated the loan terms this month and signed agreements with creditors, marking the third time it has expanded the margin facility using Arm shares. Founder Masayoshi Son continues to require billions of dollars to fund his growing AI portfolio, including the nearly $65 billion commitment to OpenAI, driving SoftBank's persistent expansion of financing channels.

Last month, SoftBank also secured a $10 billion two-year loan from lenders including Apollo Global Management (APO.US), using its OpenAI stake as collateral. Reports this week indicate Apollo is negotiating to increase another loan from $5.4 billion to $9 billion to help the Japanese company sustain its OpenAI investments.

SoftBank's AI initiatives extend beyond OpenAI, including a $5.4 billion acquisition of ABB Ltd.'s industrial robotics business and an approximately $3 billion cash purchase of DigitalBridge Group Inc., a data center-focused private equity firm. Son's escalating AI ambitions also involve major data center expansions in the United States and France. Its U.S. subsidiary SB Energy Inc. is developing 8.8 gigawatts of data center capacity nationwide, requiring an estimated $174 billion in capital expenditure, while SoftBank has announced plans for a 5-gigawatt facility in France.

As Son's multibillion-dollar AI projects accumulate with largely uncertain future revenue prospects, investors are growing increasingly concerned about this spending surge. From bonds to stock-backed margin loans and OpenAI equity-secured financing, SoftBank is tapping diverse funding sources for its AI investments. The proliferation of financing instruments makes its balance sheet more sensitive to interest rates, credit spreads, and valuation fluctuations in its AI holdings.

SoftBank faces additional pressure from OpenAI's delayed IPO timeline. This means that after deploying substantial financing into OpenAI, SoftBank may lack a clear public market exit channel in the near term, potentially extending the duration of capital lock-up. An eventual OpenAI listing would provide greater liquidity for SoftBank's equity stake, but the postponement forces the company to carry financing costs for longer while awaiting investment value realization.

For SoftBank's investors, the central challenge is shifting from "whether capital can be secured" to "at what cost capital is obtained and when AI investments will generate returns." With OpenAI's IPO schedule still unclear, the $11.1 billion junk bond issuance size and pricing serve as a critical barometer for market observers assessing SoftBank's leverage levels and credit risk profile.