SoftBank has officially wrapped up its massive $41 billion investment in OpenAI, securing a significant stake in one of the most influential companies shaping the AI future.
Quick Summary – TLDR:
- SoftBank has completed a $41 billion investment in OpenAI, now holding an 11 percent stake.
- The investment marks one of the largest private funding rounds in tech history.
- Funds will support OpenAI’s AI infrastructure push, including the Stargate data center project with Oracle.
- SoftBank aims to become a global AI leader by strengthening its tech and data center investments.
What Happened?
Japanese investment giant SoftBank has finalized its investment in OpenAI, sending over a final tranche of $22 billion to complete a record-setting $41 billion funding round. The move grants SoftBank an 11 percent stake in the ChatGPT creator and solidifies its position at the center of the global AI race.
This deal, struck earlier in March, is part of a broader strategy by SoftBank CEO Masayoshi Son to double down on artificial intelligence and the infrastructure that powers it.
BREAKING: SoftBank just completed the $40B OpenAI investment.
— Shanaka Anslem Perera ⚡ (@shanaka86) December 30, 2025
Today’s deadline. The largest private funding round in history.
But here’s what CNBC won’t tell you:
Masayoshi Son sold his ENTIRE Nvidia stake.
Dumped $9.2B in T-Mobile.
Mortgaged his Arm shares.
Slowed ALL Vision… pic.twitter.com/qfLuX1ZYDD
SoftBank’s Largest Bet Yet on AI
SoftBank’s full investment includes:
- $7.5 billion through the SoftBank Vision Fund 2 in the first closing.
- $22.5 billion in the second and final tranche.
- $11 billion syndicated from co-investors.
The total commitment hit $41 billion, making this one of the largest private tech investments ever. OpenAI’s valuation surged from about $300 billion post-money in March to nearly $500 billion after a secondary stock sale in October, according to Pitchbook data.
Masayoshi Son described the move as an “all in” bet on AI. “We are deeply aligned with OpenAI’s vision of ensuring AGI benefits all of humanity,” Son said in a statement.
OpenAI CEO Sam Altman also acknowledged SoftBank’s early support. Altman said:
The Bigger Picture: Stargate and Infrastructure Expansion
A large part of the investment is expected to fuel Stargate, a next-generation data center initiative led by OpenAI, Oracle, and backed by SoftBank. The project, reportedly valued at $500 billion, is designed to support the computing needs of advanced AI models. It was first announced by President Donald Trump in January 2025.
OpenAI’s infrastructure ambitions go far beyond data centers. The company has made over $1.4 trillion in infrastructure commitments, including deals with chipmakers Nvidia, AMD, and Broadcom to secure computing power.
This aligns with an industry-wide surge in AI infrastructure spending as demand for compute-heavy applications like generative AI continues to grow.
Strategic Moves and Divestments
To fund its AI ambitions, SoftBank recently sold off its entire $5.8 billion stake in Nvidia, once a cornerstone of its AI portfolio. The cash raised, along with other financing sources, helped finalize the OpenAI deal.
In a separate push to bolster its infrastructure holdings, SoftBank also acquired DigitalBridge, a major data center investment firm, for $4 billion. These moves highlight the company’s aggressive approach to owning not just AI companies, but also the physical backbone that enables AI systems to run.
SQ Magazine’s Takeaway
I think it’s safe to say Masayoshi Son just put SoftBank at the heart of the AI future. A $41 billion commitment is no small thing, and this deal isn’t just about owning part of OpenAI. It’s about securing influence in the infrastructure that will define the next era of computing. With Stargate and other investments lined up, SoftBank clearly wants to be more than a backer. It wants to be a builder of the AI world. That kind of bold move is risky, but if AI really is the new electricity, then Son is laying the power lines.
