Sale of shares on secondary market at that valuation. https://www.reuters.com/technology/openai-hits-500-billion-valuation-after-share-sale-source-says-2025-10

Sale of shares on secondary market at that valuation. https://www.reuters.com/technology/openai-hits-500-billion-valuation-after-share-sale-source-says-2025-10-02/ https://www.reuters.com/technology/openai-hits-500-billion-v...