
On Dec. 5, S&P Dow Jones Indices announced the companies that would be joining and leaving the S&P 500 Index (SPY), S&P MidCap 400 Index (MDY), and S&P SmallCap 600 Index (VIOO) effective Dec. 22, 2025. Now in the first full trading week of 2026, the major S&P indexes have all been rebalanced and welcomed new members, including Carvana (CVNA), Comfort Systems USA (FIX), and CRH (CRH), among others.