By contrast, small caps are lagging. They have retained none of their gains made over the past 1-1/2 years and haven't been close to a new ATH in 10 months. Should investors be worried?
By most measures, the answer is probably not. Small cap underperformance has more often marked a low in SPX, not a high. Investors should be more worried when small caps - which are highly speculative and high beta - lead, as this has most often been a feature of major bull market tops, the reverse of the situation we have now.
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Last week, SPX made a new all-time high (ATH). The DJIA equalled its ATH from October 2018 and NDX came within 1% of its ATH from just last month. The broadest measure of the US stock market, the Russell 3000, which comprises 98% of stocks, exceeded its May high and came within 0.1% of its October 2018 ATH. By most measures, US stock prices are doing well. Enlarge any chart by clicking on it.