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December stock market rally at risk: AI fears and Fed decision could send S&P 500 tumbling - experts weigh in

S&P 500 predictions December 2025: Wall Street's year-end stock rally is facing challenges. Investors are worried about high AI valuations and slowing economic growth. Mixed signals from the Federal Reserve are also causing unease. Despite historical December gains, the S&P 500 is on track for a monthly loss. Tech stocks are particularly vulnerable due to AI rivalry concerns.