Observed Signal · Oct 1, 2026 · Funding · Source: SoftBank Group · Impact: 2/5
OpenAIへの追加出資（サードトランシェ）の実行に関するお知らせ
SoftBank Group announced the completion of its final third tranche investment of $10 billion (approx. 1.58 trillion yen) into OpenAI Group PBC via SoftBank Vision Fund 2 on October 1, 2026. This finalizes SoftBank's $30 billion follow-on investment agreed in February 2026, bringing its cumulative investment in OpenAI to $64.6 billion and an ownership stake of approximately 13%. The tranche was funded through foreign currency senior notes issued in September 2026, alongside the full cancellation and payoff of its $40 billion bridge loan facility.
Securing a 13% ownership stake in OpenAI cements SoftBank as a dominant financial backer of foundation AI models, deeply impacting capital allocation across global tech, cloud infrastructure, and AI ecosystems.
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Key Takeaways & Evidence Grounding
- SoftBank executed the final $10 billion third tranche investment into OpenAI on October 1, 2026, completing the $30 billion commitment announced on February 27, 2026.
- SoftBank's cumulative investment in OpenAI has reached $64.6 billion, representing an equity ownership stake of approximately 13%.
- The $10 billion tranche (calculated at 157.96 JPY per USD, or 1.5796 trillion yen) was funded using proceeds from foreign currency senior notes issued in September 2026.
- The remaining $10 billion borrowing capacity under the $40 billion bridge facility agreement from March 27, 2026, was cancelled on September 30, 2026, marking the full payoff of the facility.
Connected Companies & Entities
1 Entity mapped“Executing entity that completed its final $10 billion tranche investment through SoftBank Vision Fund 2.”
Related Market Signals & Shifts
Recent verified developments and strategic activity across this market segment.
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