S&P 500 Halts Four-Day Slide: AI Chip Selloff Erases $1T as Healthcare Surges S 500 AI chip selloff on June 26, 2026 ended with a small index decline while chip stocks fell sharply and Moderna led a healthcare rebound. The protected headline's $1T wording refers to a separate J... AI Stocks Chip Stocks S&P 500 27-Jun-2026 0 317