OpenAI Closes Record $40 Billion Funding Round at $300B Valuation

On March 31, 2025, OpenAI finalized a $40 billion funding round — the largest private fundraise in history — at a $300 billion post-money valuation. SoftBank led with $30 billion, joined by Microsoft, Coatue, Altimeter, and Thrive.

About $18 billion is earmarked for the Stargate infrastructure project. By December 2025, OpenAI was reportedly seeking an additional $100 billion at an $830 billion valuation. This opened a new chapter in AI industry financial history.