A key segment of the U.S. stock market, comprised of companies with strong balance sheets and stable earnings, is experiencing a period of underperformance relative to the rest of the market, drawing comparisons to the dot-com bubble of 1999.

S&P 500 Quality Index Lags Broader Market By Most In 26 Years

According to the data pointed out by Jeff Weniger, the Head of Equities at WisdomTree, the S&P 500 Quality Index has lagged the broader S&P 500 by a substantial margin.

This lag is the most pronounced since 1999, a period known for speculative investor behavior that often favored high-growth potential over fundamental strength.

The rally off the April lows has left Quality stocks behind. The S&P 500 Quality Index has lagged the market by 10.4 percentage points over the last 6 months, akin to observations from 1999. pic.twitter.com/XePAYL0J23

— Jeff Weniger (@JeffWeniger) October 7, 2025

S&P 500 Gains Outpace The Quality Index

Performance data confirms this trend, showing the Quality Index returned 15.13% over the last six months, while ...