SoftBank Finalizes $22.5 Billion Tranche, Fulfills OpenAI Commitment

SoftBank Group said in a press release that it completed the final tranche of a multibillion-dollar investment in OpenAI on December 26, 2025, bringing its total funding, together with syndicated co-investors, to $41.0 billion. The company specified that the December payment amounted to $22.5 billion, following a first closing in April 2025 when SoftBank deployed $7.5 billion through its SoftBank Vision Fund 2 vehicle.

The March 31, 2025 commitment had pledged up to $40.0 billion into a for-profit subsidiary of OpenAI, structured as a mix of direct capital and syndicated co-investment. SoftBank’s release says the final aggregate includes $11.0 billion of oversubscribed third-party participation, producing the $41.0 billion headline figure; other public characterizations of the arrangement had cited a roughly $40 billion commitment by SoftBank alone. The company did not disclose an exact ownership percentage in its press materials.

The scale and timing of the closings mark a major financial endorsement of OpenAI’s growth plans. SoftBank and its co-investors said the capital will support AI infrastructure needs and strategic ventures, including a previously announced joint effort involving cloud and systems partners known publicly as Stargate. SoftBank’s broader pivot into AI has been financed in part by liquidity from asset sales, including a divestment of a stake in Nvidia that generated roughly $5.8 billion, enabling the company to redeploy funds into the OpenAI commitment and related AI bets.

Industry analysts describe the transaction as among the largest private funding efforts in technology, deepening SoftBank founder Masayoshi Son’s concentrated wager on generative AI. For OpenAI, the influx of capital reduces near-term funding uncertainty as the company scales compute and product development, while also shaping governance and ownership dynamics as outside investors take large positions in the organization’s for-profit arm.

The financing also raises questions for regulators and the broader AI ecosystem. Large, concentrated private stakes can influence strategic direction, partnership alignment, and market competition in cloud infrastructure, model development, and commercial deployments. The deal could intensify scrutiny of how major investors interact with platform providers and cloud partners, and whether such arrangements affect access to compute and data for competitors.

OpenAI has previously outlined ambitious capital needs tied to accelerating model development and infrastructure, and this closing substantially advances those plans. SoftBank’s press release supplied the clearest public accounting of dates, amounts, and the use of SVF2 for its closings. OpenAI did not publicly comment on the closing in response to the release.