S&P 500 Today (Dec. 15, 2025): Index Slips After the Bell as AI-Bubble Jitters Persist and Markets Brace for Jobs, CPI
The S&P 500 finished modestly lower on Monday, December 15, 2025, as Wall Street entered the final full trading week of the year with a familiar tension: investors are increasingly reluctant to keep “all the eggs in the AI basket,”