The average S&P 500 stock had a tough go of it in December. But better times could lie ahead in 2025. December wasn’t exactly a great month for stocks, but the traditional capitalization-weighted S&P 500 SPX still managed to steamroll its equal-weighted sibling XX:SP500EW. By the time the ball dropped on New Year’s Eve, the S&P 500 had outperformed its equal-weighted version by nearly 4 percentage points — the widest gap for any month since June, and the seventh-widest going back to 1990, Dow Jones Market D ...