AI Stock Frenzy: Nvidia’s $100B OpenAI Bet and Major Tech AI Moves Send Shares Surging (Sept 24–25, 2025)
Nvidia announced up to $100 billion investment in OpenAI, sending its market value above $4.2 trillion and shares to record highs. Microsoft added Anthropic’s AI models to Copilot and signed a $17.4 billion GPU deal with Nebius. Alibaba surged 10% after unveiling a 1-trillion-parameter AI model and new data center plans. Fed comments on high equity valuations briefly cooled tech stocks, while California advanced AI regulation.