Microsoft → OpenAI: amount not disclosed investment
Recapitalization: Microsoft at 27% of OpenAI Group PBC. OpenAI becomes a public benefit corporation; Microsoft holds about 27% on a diluted basis (worth ~$135 billion at the time), with IP rights to models and products through 2032.
- Date
- Oct 28, 2025
- Paid by
Microsoft- Received by
OpenAI- Type
- Investment
- Amount
- amount not disclosed
- Status
- closed
- Note
- ~27% stake (~$135 billion)
Sources
Loops that include this flow
All deals between Microsoft and OpenAI
- Jan 23, 2023 Microsoft → OpenAI · Microsoft invests about $13 billion in OpenAI $13B
- Oct 28, 2025 OpenAI → Microsoft · OpenAI commits to buy $250 billion of Azure $250B
- Oct 28, 2025 Microsoft → OpenAI · Recapitalization: Microsoft at 27% of OpenAI Group PBC n/a
- Mar 24, 2026 Microsoft → OpenAI · Microsoft joins $122 billion round n/a
- Apr 27, 2026 OpenAI → Microsoft · Microsoft-OpenAI: amended deal ends exclusivity n/a
More Microsoft / OpenAI deals
- Nov 5, 2026 Microsoft does not double Nscale Texas contract n/a
- Oct 29, 2026 Microsoft returns to the market: $25 billion $25B
- Oct 28, 2026 OpenAI wants to buy Google TPUs n/a
- Aug 17, 2026 OpenAI leases 8 GW Ohio campus for 20 years n/a
- Jul 22, 2026 Project Camellia: $20 billion campus in Georgia n/a
- Jun 15, 2026 Microsoft pulls out of Nscale Loughton data center $3B
- Jun 5, 2026 OpenAI proposes 5% stake to US government n/a
- May 11, 2026 TPG leads $4 billion into OpenAI's DeployCo $4B
- Apr 23, 2026 Microsoft's A$25B Australia pledge $18B
- Apr 14, 2026 Microsoft takes over Stargate Norway capacity n/a
- Apr 3, 2026 Microsoft to invest $10bn in Japan $10B
- Mar 24, 2026 Microsoft may prepay Samsung $10bn+ for memory $10B