Shares of SoftBank Group Corp. saw significant volatility in Tokyo trading following reports of a potential additional investment of up to $30 billion in OpenAI. The stock initially surged as much as 8.8% before paring gains to close approximately 3.4% higher. This move underscores a profound strategic shift, positioning one of the world’s most prominent technology investors for an all-in wager on artificial intelligence.
A Potential $30 Billion Follow-On Investment
According to media reports, SoftBank is in negotiations to commit up to $30 billion in new capital to OpenAI. This substantial sum would form part of a broader funding round that could raise as much as $100 billion for the AI research company.
Key details of the potential transaction include:
* Proposed new investment: Up to $30 billion
* SoftBank’s existing OpenAI stake: 11%, acquired for $41 billion in December
* OpenAI’s potential valuation: Approximately $830 billion
* Target size of OpenAI’s funding round: Up to $100 billion
This prospective investment builds upon SoftBank’s existing $41 billion commitment from late last year. Should the deal proceed, it would cement SoftBank’s status as one of the most AI-focused major investors globally.
Portfolio Reallocation and Financial Implications
To fund this aggressive AI push, SoftBank has been reallocating capital, notably slowing the pace of new commitments through its Vision Fund. Recent strategic divestments and halted initiatives highlight this consolidation of resources.
Notable steps include the complete sale of its Nvidia holding for $5.83 billion and the cessation of talks to acquire U.S. data center operator Switch Inc.
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Financial analysts have raised concerns regarding the balance sheet impact. Experts at Bloomberg Intelligence note that SoftBank’s credit rating (BB+) could face pressure if the additional $30 billion is deployed. The adjusted loan-to-value ratio might approach the 35% threshold that typically triggers a downgrade, potentially necessitating further asset sales and margin loans of at least $15 billion.
Deepening Ties Through the “Stargate” Initiative
Beyond direct equity investment, SoftBank is expanding its operational partnership with OpenAI. Both companies are key backers of the “Stargate” project, a joint initiative valued at around $500 billion aimed at constructing large-scale AI data centers in the United States.
Recent collaborative efforts involve a $500 million investment from each company into SB Energy, a SoftBank subsidiary. SB Energy is tasked with developing data center and energy infrastructure to support OpenAI’s operations, including the construction and management of OpenAI’s 1.2-gigawatt data center in Milam County, Texas. The Stargate project already has nearly 7 gigawatts of planned capacity and secured investment commitments exceeding $400 billion.
Navigating a Competitive Landscape and Concentration Risk
SoftBank’s deepening commitment to OpenAI unfolds against a backdrop of intensifying competition and rising costs within the AI sector. OpenAI itself faces escalating operational and model training expenses, while rivals are making significant strides. Competitor Anthropic recently raised its 2026 revenue forecast by 20%, and Google continues to advance and expand its Gemini model suite.
Market observers like Tomoichiro Kubota of Matsui Securities view the progress in OpenAI’s financing as a short-term positive for SoftBank’s share price but caution about the increasingly challenging competitive environment.
From a portfolio perspective, OpenAI could eventually surpass chip designer Arm as SoftBank’s largest holding. Based on currently discussed valuations, the OpenAI stake might constitute over 30% of the total portfolio value. This strategy, championed by CEO Masayoshi Son, concentrates a substantial portion of the conglomerate’s value in a single AI bet—amplifying both the potential for outsized growth and the risk associated with any sector-wide valuation correction.
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