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Softbank has fully funded $40 billion investment in OpenAI, sources tell CNBC

SoftBank’s $41 billion investment secures an 11% stake in OpenAI, supporting AI infrastructure and the Stargate joint venture with Oracle, the company said.

  • On Dec 30, SoftBank Group completed its $40 billion investment commitment to OpenAI, CNBC reported Tuesday, marking one of the largest private funding rounds and deepening Masayoshi Son's AI bet.
  • SoftBank had previously syndicated $10 billion and invested $8 billion, with the deal structured as a mix of direct capital and syndicated co-investors, sources told CNBC.
  • A final tranche of $22 billion to $22.5 billion completed the payment schedule last week, with portions supporting OpenAI's Stargate joint venture with Oracle.
  • The funding cements OpenAI's role as a central pillar of AI industry spending, as AI has become the central axis of global technology markets this year.
  • Sources had expected payments over a 12 month period, as SoftBank Group builds its AI and data-center infrastructure program, CNBC reported.
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The Japanese SoftBank group has completed the total investment commitment of $40 billion in the OpenAI, according to sources of CNBC. The last transaction, between $22 and $22.5 billion, has been transferred last week, specifying people familiar with the transaction.

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Japan's technology investment giant SoftBank announced on Wednesday that its participation in the US OpenAI (ChatGPT) was now about 11% after completing the second stage of a total investment of $41 billion.

·Montreal, Canada
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Benzinga broke the news in New York, United States on Tuesday, December 30, 2025.
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