Stock Market Today, Oct. 16: Tech Stocks Plunge as AI Software Valuations Reverse
Major tech indices declined on October 16, 2026, as AI-focused software stocks experienced a sharp reversal. The S&P 500 fell 1.07%, the Nasdaq Composite plummeted 2.15%, and the Dow Jones slipped 0.34%. Goldman Sachs reported that hedge funds sold AI stocks at the second-fastest pace in over a year, triggering a tactical rotation away from smaller AI names toward larger, steadier companies and defensive stocks.