The Russell 2000 index has underperformed the Nasdaq 100 for the past 17 years, with small-cap stocks rising 284% since 2007 compared to a 1,159% increase in the Nasdaq 100. This underperformance is now at levels not seen since the 2000 Dot-Com Bubble. Additionally, the Russell 2000 is experiencing its worst year relative to the S&P 500 since 1998. The concentration of market value among the largest stocks in the S&P 500 is also growing, with the top 10 stocks now representing 40% of the index's market cap, a figure that is double what it was seven years ago and 14 percentage points above the levels seen during the Dot-Com Bubble. Only 31% of S&P 500 firms have outperformed the index year-to-date, matching one of the lowest readings recorded in the last 70 years, previously only seen during the late 1990s.