The Stock Market Just Did Something for the 11th Time Since 1984. History Says It Signals a Big Move in the Next Year.
To put it simply, a significant chunk of the S&P 500’s advancements in the first half of the year can be attributed to just a few large-scale companies. Interestingly, the S&P 500 outperformed an index called the S&P 500 Equal Weight Index by about 1.7 percentage points. This other index gives equal importance to every stock within it, rather than favoring those with larger market values.