Looking at the 8 other times the Nasdaq Composite formed a major peak, there was not a lot of back-and-forth price action. The index tended to rally hard into the peak, then fall hard right after.; So far in 2020, the difference in year-to-date returns through August in technology stocks is more than 75% higher than for energy stocks. That's the widest split since 1932. Only 1987 and 2000 saw a sector split nearing 50% through August of those years. Historically, the ratios between best and worst sectors tended to narrow after such wide differences in returns.

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