Key Takeaways
- SoftBank Group’s equity investors are refocusing on potential returns from its artificial intelligence investments, driving a stock rebound despite rising borrowing costs.
- The shares posted their first monthly gain in four months in September, rising 24% over four weeks, fueled by optimism from OpenAI’s GPT-6 Astra model and its plan to raise $30 billion at a $1.4 trillion valuation.
- A recovery in Arm Holdings’ share price bolstered confidence in SoftBank’s ability to finance growing debt related to its AI bets.
- Despite the equity gains, SoftBank’s credit default swaps (CDS) spiked to their highest level since 2023, reflecting persistent market concerns over AI safety, soaring costs, and intense competition.
- This divergence between rising equities and worsening CDS contrasts sharply with Oracle’s situation, where the company cited force majeure to mitigate surging data center expenses, highlighting differing market perceptions of tech infrastructure risks.
SoftBank Stock Rebounds on AI Optimism Amid Debt Concerns
SoftBank Group’s shares experienced a notable turnaround in September, marking their first monthly gain after four consecutive months of decline. This rebound was primarily driven by renewed investor enthusiasm surrounding the company’s substantial artificial intelligence commitments, particularly its $65 billion backing of OpenAI. As reported, "SoftBank shares posted their first monthly gain in four months in September, after OpenAI’s new GPT-6 Astra model rekindled optimism around Masayoshi Son’s $65 billion commitment to the ChatGPT creator." The stock subsequently rose 24% over a four-week period, signaling a shift in market sentiment toward the potential upside of SoftBank’s AI-focused strategy, even as broader concerns about its financial leverage persisted.
OpenAI’s Funding Plan and Valuation Boost Confidence
A significant catalyst for the September rally was OpenAI’s ambitious fundraising initiative, which directly bolstered confidence in SoftBank’s strategic position. The AI startup’s plan to secure $30 billion in fresh capital at a staggering $1.4 trillion valuation served as a powerful validation of the generative AI sector’s perceived worth and SoftBank’s early, sizable bet. This development alleviated some investor worries about the viability and scalability of the AI investments underpinning SoftBank’s future growth narrative. The sheer scale of the proposed funding round and the implied valuation underscored the market’s current appetite for AI leadership, providing a tangible tailwind for SoftBank’s equity performance despite its own complex financial structure.
Arm Holdings Recovery Adds Financial Resilience Narrative
Beyond the OpenAI-driven optimism, the resurgence in the share price of SoftBank’s chip design arm, Arm Holdings, played a crucial role in reinforcing investor confidence regarding the conglomerate’s capacity to manage its debt burden. Arm, which SoftBank took public again in 2023 after a brief return to private ownership, is viewed as a more stable, cash-generating asset within the portfolio. Its strengthening performance signaled to investors that SoftBank possesses valuable, liquid assets that could potentially be leveraged or sold to address debt obligations if necessary. This perception of underlying asset quality and potential financing flexibility helped counterbalance narratives solely focused on the speculative nature and high costs associated with its direct AI ventures like the OpenAI commitment.
Credit Default Swaps Spike Reveals Underlying Debt Anxiety
Despite the positive equity movement, SoftBank’s credit metrics painted a more concerning picture, highlighting a growing divergence between stock market optimism and bond market caution. The cost of insuring SoftBank’s debt against default, as measured by credit default swaps (CDS), climbed to levels not seen since 2023. This increase reflects persistent and deep-seated investor anxiety regarding the company’s financial health, specifically tied to the escalating costs associated with its AI investments, ongoing questions about the safety and regulatory future of advanced AI systems, and the intensifying competitive landscape within the technology sector. The rising CDS spread indicates that while equity traders are betting on AI-driven upside, debt market participants are increasingly wary of the potential downside risks stemming from SoftBank’s leverage and the capital-intensive nature of its strategic bets.
Divergence Highlights Contrast with Oracle’s Force Majeure Argument
The contrasting trajectories of SoftBank’s equities and CDS starkly illustrate differing market assessments of risk among major technology infrastructure players, particularly when compared to companies like Oracle. While SoftBank faces skepticism over its ability to finance AI-related debt despite equity gains, Oracle has taken a different approach to mitigate pressures from soaring data center costs. As noted in the source, "The divergence between SoftBank’s CDS and equities contrasts with a selloff in shares of Oracle, which has cited force majeure to shield itself from surging data center expenses." Oracle’s invocation of force majeure—a contractual clause excusing liability for unavoidable catastrophes—to cope with rising operational costs in its cloud infrastructure business stands in sharp relief to SoftBank’s strategy of doubling down on high-risk, high-reward AI bets funded partly through debt. This comparison underscores how the market is distinguishing between companies attempting to manage immediate, tangible cost pressures through legal or operational means (Oracle) and those like SoftBank, whose valuation is increasingly tied to the uncertain, long-term payoff of speculative AI ambitions amid rising financial strain. The equity-CDS gap for SoftBank remains a critical barometer of whether its AI optimism can translate into sustainable financial strength or if the debt burden will ultimately undermine the strategy.
https://www.japantimes.co.jp/business/2026/10/02/companies/softbank-ai-return-investors/