AI Stocks Frenzy: Nvidia’s $100B Bet & Other Big Moves Ignite Markets (Sept 28–29, 2025)
NVIDIA said it plans to invest up to $100 billion in OpenAI, sending its shares to record highs and sparking antitrust warnings. Alphabet reached a $3 trillion valuation after a key court win, while Alibaba stock surged 10% on new AI initiatives. U.S. and EU regulators stepped up scrutiny, and Asian chip stocks fell on U.S. export curbs. Major indexes stayed near highs as AI optimism and fiscal stimulus fueled gains.