SoftBank Group issued $6.29 billion in corporate bonds, the largest single debt raise in the conglomerate's history and nearly twice the ¥600 billion ($3.9 billion) offering completed in April 2025. The issuance comes as the Tokyo-based holding company accelerates capital formation ahead of what Masayoshi Son has framed as the "largest AI infrastructure buildout in human history."
The bond structure and tenor remain undisclosed at time of filing, but the April offering carried a weighted average maturity of 4.7 years and pricing at 180-220 basis points over Japanese government bonds depending on tranche. SoftBank's investment-grade rating from both Moody's (Baa3) and S&P (BBB-) has held since Q3 2024, granting access to institutional debt markets without triggering covenant restrictions. The company reported ¥5.6 trillion in net debt as of December 2024, offset by ¥8.1 trillion in equity holdings across Vision Fund, Arm Holdings, and direct positions in OpenAI, Perplexity, and TSMCreating meaningful contrast requires examining what changed between April and now. In the four months since the prior record issuance, SoftBank deployed $1.8 billion into three unnamed AI infrastructure companies, increased its Arm stake by 220 million shares at an average cost of $138, and committed to Project Stargate's $500 billion datacenter consortium alongside Oracle and OpenAI. The accelerated pace suggests the bond proceeds fund commitments already made rather than speculative positioning. Son told investors in March that SoftBank would need to raise $70-90 billion in fresh capital by 2027 to maintain pro-rata participation in follow-on rounds across its AI portfolio—rounds he expects to occur at 18-24 month intervals rather than the traditional three-year cycle.
The timing also reflects a narrow window in Japanese corporate bond markets. The Bank of Japan's March decision to hold rates at 0.25% kept funding costs suppressed even as inflation exceeded 2.7% for eleven consecutive months. Global allocators absorbed ¥1.4 trillion in Japanese corporate debt during Q1 2025, the highest quarterly total since 2019, driven by spread compression and yen carry dynamics. SoftBank is issuing into demand, not creating it. The question for credit allocators is whether the company's AI thesis justifies leverage that now exceeds 68% of total capitalization on a gross basis.
Operators should watch SoftBank's June 18 earnings call for disclosure on bond proceeds allocation and any updated guidance on Vision Fund III's final close, currently targeting $150 billion with $87 billion committed as of April. The company's Arm holdings—90.6% of shares outstanding—face a lockup expiration on August 12, which could provide alternate liquidity if equity markets prove more receptive than debt. Any acceleration in datacenter land acquisitions across Texas, Arizona, or Northern Virginia would confirm capital deployment into physical infrastructure rather than equity stakes.
SoftBank now controls more debt capital than at any point in its forty-three-year history, issued at the moment when its largest portfolio companies require the most patient, most expensive kind of funding. The bonds price the belief that inference costs drop faster than buildout costs rise.