US Stock Market Today: S&P 500 and Nasdaq Rally on Cooler Inflation as Micron Reignites Tech — Nike and FedEx Report After the Bell (Updated 4:15 PM EST, Dec. 18, 2025)
The S&P 500 rose 0.78% to 6,773.91 and the Nasdaq gained 1.37% Thursday after U.S. inflation slowed to 2.7% and Micron issued a strong profit forecast. The 10-year Treasury yield dropped to 4.11%. Jobless claims fell, signaling a cooling but stable labor market. Lululemon and Trump Media both jumped on deal and stake news.