SoftBank's $30 Billion AI Gambit Reshapes Its Strategic Foundation

SoftBank commits $30B to OpenAI's record $110B round, acquires DigitalBridge for infrastructure, aiming for vertical integration in AI from chips to models.

In a move that underscores its ambition to dominate the artificial intelligence sector, Japan's SoftBank Group has committed $30 billion to the largest private funding round ever recorded. This capital infusion secures the conglomerate a substantial stake in OpenAI, reinforcing a comprehensive strategy to exert influence across the entire AI value chain.

A Vertical Integration Strategy Takes Shape

SoftBank's vision extends far beyond venture capital. The company is systematically assembling a vertically integrated AI empire. This strategy encompasses physical infrastructure, semiconductor design, advanced model development, and telecommunications. The recent $4 billion all-cash agreement to acquire DigitalBridge—at $16 per share, with closure anticipated in the second half of 2026—exemplifies this push. DigitalBridge manages $108 billion in infrastructure assets, including data centers, fiber networks, and cell towers, bringing three decades of expertise.

This acquisition marks a pivotal shift from investor to operator in the infrastructure layer. The blueprint is clear: DigitalBridge provides the hardware foundation, Arm Holdings (in which SoftBank holds a majority stake) delivers chip architecture, and OpenAI focuses on frontier AI model development.

Record Funding and Strategic Alliances

The historic funding round for OpenAI totaled $110 billion. Participants included Amazon with a $50 billion investment, and Nvidia alongside SoftBank, each contributing $30 billion. Prior to this round, OpenAI's valuation stood at $730 billion.

SoftBank is not a new partner for the AI research lab. Following a $40 billion round led by the conglomerate the previous year and the completion of this latest transaction, SoftBank's ownership stake in OpenAI reaches approximately 11%. The partnership is multifaceted; OpenAI will leverage SoftBank's global network for international expansion. This is critical in a landscape where major tech firms and large investors are vying for strategic ties with OpenAI, which is making massive investments in data center capacity. Close alliances are increasingly viewed as a competitive necessity in the AI race.

Core Telecom Business Provides Stability

Amidst these transformative investments, SoftBank's established telecommunications arm, SoftBank Corp., delivers consistent financial performance. For the first nine months of fiscal year 2025, revenue increased by 8% to a record 5.2 trillion yen for the period. Operating profit similarly rose by 8%, reaching 884 billion yen.

Based on these results, the telecom subsidiary raised its full-year forecast. It now projects revenue of 6.95 trillion yen, up from a previous outlook of 6.7 trillion yen, and operating profit of 1.02 trillion yen. Further momentum is provided by the strong performance of Arm Holdings, whose growth is being fueled by AI applications extending well beyond the smartphone market.

Portfolio Rebalancing and NAV Dynamics

SoftBank Group's net asset value (NAV) experienced a 6% decline in the third quarter of fiscal 2025. A primary driver was a 23% drop in Arm's share price during the quarter. This was partially offset by a 60% valuation increase in the Vision Fund 2, largely attributable to the rising valuation of its OpenAI holding.

A significant portfolio shift is notable: SoftBank has completely exited its position in Nvidia. The stake, valued at approximately $5.83 billion, was sold to free up capital for direct infrastructure investments, aligning with its new strategic direction.

Controlling the Chain from Silicon to Intelligence

By early 2026, SoftBank aims to command the AI value chain from the physical infrastructure layer to the development of advanced models. Its stated mission is to realize artificial superintelligence for the benefit of humanity—a goal it believes requires breakthroughs not only in AI models but also in the platform infrastructure necessary for training, deployment, and global operation.

With DigitalBridge, OpenAI, Arm, and a record-setting telecom business, SoftBank has assembled an exceptionally broad presence within the AI ecosystem. The market will gain further insight into the progress of this ambitious strategy when the company releases its next quarterly results on May 7, 2026.