SoftBank Group priced a record ¥1 trillion ($6.3 billion) retail bond on Sept. 4 with a 4.75 percent coupon, the largest retail bond offering by a Japanese company. The seven-year yen-denominated debt will fund AI investments and refinance existing obligations.

The coupon sits nearly 275 basis points above the Bank of Japan's projected terminal rate of just under 2 percent — a significant spread that explains robust retail demand. Retail investors, who typically accept higher issuer credit risk than institutional buyers, have consistently favored SoftBank's higher-yielding offerings, particularly against the backdrop of near-zero bank deposit rates.

SoftBank has established retail bonds as a core financing channel through offerings tied to its "Fukuoka SoftBank Hawks Bonds," named after a baseball team the conglomerate owns. The company has become Japan's most prolific corporate issuer by volume in recent years, according to I-N Information Systems data.

The ¥1 trillion issuance matches NTT Finance's institutional debt offering in size. Proceeds will support SoftBank's expanding artificial intelligence strategy, including substantial commitments to OpenAI that are expected to surpass $60 billion cumulatively.

Masahiro Ichikawa, chief market strategist at Sumitomo Mitsui DS Asset Management, said the 4.75 percent coupon appeals to individual investors seeking returns above bank deposits. The yield spread over the BOJ's policy rate trajectory attracted enough demand to clear the offering.

Credit rating disparities complicate the picture. Japanese agencies assign SoftBank solid investment-grade marks, but major foreign agencies maintain speculative-grade ratings, citing high leverage and volatile technology asset exposure. A rising interest rate environment could test the group's financial position as refinancing needs emerge.

To offset funding pressures, SoftBank has monetized portfolio assets, including the sale of its entire Nvidia stake. The company has also expanded financing arrangements secured by its majority stake in chip designer Arm.