S&P 500 Gains and Losses Today: AI Stocks Plunge as DeepSeek Model Gains Traction
1. S&P 500 fell 1.5% due to AI market shifts. 2. Chinese startup DeepSeek's AI outperformed OpenAI, affecting investor sentiment. 3. Power and chip stocks plunged amid uncertainty over AI profitability. 4. AT&T and HCA Healthcare saw stock gains from strong earnings. 5. Utilities and semiconductor firms faced heavy losses on AI concerns.