SoftBank's trillion-yen retail bonds lock in a 4.75% coupon rate, as Masayoshi Son directs Japan's savings pool towards the AI supercycle.

As interest rates rise, enhancing the appeal of bonds and possibly prompting more companies to turn to retail financing models, SoftBank Group Corp., led by legendary investor Masayoshi Son, has set a coupon rate of 4.75% for a retail bond issuance of up to 1 trillion yen (approximately 6.3 billion USD). This latest financing initiative underscores SoftBank's efforts to leverage Japan's vast pool of household savings to secure long-term yen funding and diversify its sources of financing away from bank loans, institutional bonds, and foreign currency, thereby providing capital allocation space for investments in AI leaders like OpenAI, AI data center construction, and refinancing of existing debt, which is crucial for Sons vision of super artificial intelligence. The bonds issued by SoftBank are unsecured ordinary corporate bonds targeting individual investors, with a ten-year maturity, a scale of 1 trillion yen, and a coupon rate of 4.75%, setting a record for retail corporate bond issuance in Japan. The interest rate is approximately 245 basis points higher than the average of 2.3% for Japanese yen-denominated retail corporate bonds this year, reflecting the trend of household funds flowing from bank deposits to bonds following the normalization of Japanese interest rates, as well as investors demands for higher returns from SoftBank to account for its leverage, asset price fluctuations, and AI investment risks. As SoftBank issues a record 1 trillion yen in retail bonds targeted at Japanese investors, demand for AI computing power and real orders in the computing power industry chain continue to indicate strong demand: Nvidia's Q2 revenue for fiscal year 2027 increased by 106% year-on-year to $96.2 billion, with data center revenue up 117% to $89 billion, and its growth outlook for fiscal year 2028 defined as "supply-constrained" for about 70%; Anthropic recently signed a $35 billion Lambda computing power agreement and a six-year contract worth approximately $45 billion for Nscale computing power. South Korea's semiconductor exports surged 209% year-on-year to $46.65 billion in August, with computer exports increasing by 419.5%, which officials clearly attribute to the expansion of hyperscale cloud vendors in AI computing power infrastructure such as HBM, as well as rising prices for enterprise-grade high-performance DRAM and SSDs. SoftBank is relying on Japan's vast pool of savings to sustain its AI ambitions. Recent news indicates that SoftBank Group has set the coupon rate for its record-breaking 1 trillion yen retail bonds at 4.75%. The capital raised will not all be directly invested in OpenAI, but will also be used for AI-related investments and the repayment of existing bonds. This 1 trillion yen bond issuance marks the largest single retail corporate bond issuance in Japanese corporate history, surpassing SoftBank's previous record of 600 billion yen. Furthermore, as of September 4, the total issuance of yen-denominated retail corporate bonds in Japan this year has reached 2.88 trillion yen, exceeding the total issuance for any previous entire year. According to documents submitted by the company, the pricing of these seven-year bonds was at the upper end of the 4.3%-4.9% range announced by the company last month. Data compiled by Bloomberg shows that the average coupon rate for yen-denominated retail corporate bonds issued in Japan this year stands at 2.3%. This issuance comes at a time when the yield on Japans 10-year government bonds has recently breached the critical 3% mark for the first time in nearly 30 years, making bonds more attractive to households that traditionally hold most financial assets in bank deposits. Kazuma Ogino, a senior credit analyst at Nomura Securities, stated, "This yield level and the issuance size of 1 trillion yen could attract new individual investors into the Japanese corporate bond market." He noted that retail investors who hold bonds to maturity are less affected by interim price fluctuations and can benefit from higher yields; this is a "tailwind" for the retail bond market. As shown in the chart above, the issuance scale of yen-denominated retail bonds in Japan has reached a historical high for 2026 as of September 4. Note: This is based on the pricing date. Data for 2025 and earlier reflects the total annual amount; data for 2026 is as of September 4. According to the latest compiled data from institutions, as of this year, the issuance scale of yen-denominated retail corporate bonds in Japan has reached 2.88 trillion yen, including SoftBank Group's issuance of 1 trillion yen; as of September 4, this total has exceeded that of any previous full year's issuance. As the demand for financing for mergers and acquisitions and growth investments increases, large-scale bond issuances targeted at institutional investors may put pressure on spreads. According to Ogino from Nomura, "Attracting a variety of retail/individual investors can diversify funding sources and alleviate this pressure. This could create a win-win situation and help broaden the retail bond market." Masayoshi Son's Vision of Super Artificial Intelligence This significant issuance of 1 trillion yen-level retail bonds aligns perfectly with and strongly supports Masayoshi Son's strategic shift from "investing in AI companies" to building a full-stack platform for ASI (super artificial intelligence). However, the high coupon rate of 4.75% also indicates that SoftBank must rely on higher AI asset returns to cover its funding costs. From an industrial perspective, SoftBank is assembling a comprehensive ASI stack comprising chip architectureprocessorsdata centerscloud computing powermodels and enterprise applications. SoftBank aims not only to benefit from the rising valuation of OpenAI but also to capture multi-layered profit pools from chip IP, server processors, data center energy, power rental, and model applications; once ASI technology emerges, it will drive internal demand and customer collaboration across various levels, with its value potentially exceeding that of single-point holdings. However, the full stack approach will also simultaneously amplify capital expenditures, technological integration, capacity utilization, and concentration risks related to OpenAIissuing 1 trillion yen in bonds proves that SoftBank still possesses strong financing capabilities, but it does not equate to the economic viability of the projects being validated; ultimately, success depends on whether computing power utilization and AI cash flows can consistently outperform the 4.75% debt costs. The AI super platform SoftBank is currently building is no longer a single-point bet, but rather an increasingly complete "ASI comprehensive stack": at the foundation are Arm architecture and Arm-developed data center CPUs, in the middle layer are AI chip design company Graphcore Ltd. fully acquired by SoftBank Group and the recently acquired Ampere, and on the upper layer are OpenAI, Stargate (the "Star Gate"), as well as a joint enterprise-level cloud AI computing power platform layout with Oracle, in addition to the new cloud force SB Neo (Neocloud); Masayoshi Son has publicly stated that SoftBanks goal is to become the largest provider of AI computing power and application-level infrastructure under the ASI era over the next decade, and it has adopted an almost "all in" aggressive investment posture toward OpenAI, a leader in large global AI models and developer of ChatGPT. Oracle primarily serves as the cloud and infrastructure partner to Stargate, while SoftBank's joint venture platform is SB OpenAI Japan, established in collaboration with OpenAI.