The Dow and S&P 500 are soaring — but this unloved stock index is absolutely roaring

Core Insights - The "January effect" for small-cap stocks is now observed to begin in December, indicating a shift in market behavior [1] Group 1 - Small-cap stocks are experiencing a seasonal trend where their performance improves earlier than traditionally expected [1] - This change may suggest a new investment strategy for those focusing on small-cap equities [1] - The phenomenon could impact overall market dynamics as investors adjust their strategies in response to this trend [1]