Microsoft stock jumps over 4% after tech giant reaches $500 billion valuation deal with ChatGPT-maker OpenAI
Microsoft stock jumped more than 4% during the intraday Wall Street session on Tuesday, 28 October 2025, after the tech giant reached a $500 billion valuation deal with the artificial intelligence (AI) ChatGPT-maker OpenAI.
Microsoft and OpenAI reached a deal which seeks to allow the ChatGPT maker to restructure its business into a public benefit corporation, which will give the company more freedom in its business operations.
