QQQ daily chart #2 - showing percent cumulative change since the 2/23/2018 price close for the current 6 top components in QQQ:
AAPL AMZN MSFT FB GOOG GOOGL
* note that since at least mid-2017, only ten components of the 100 symbols in QQQ account for over 55% of the % change each day by QQQ ... a small # of weighted component stocks can continue to advance the QQQ to higher levels, if these stocks continue to advance to new 52-week price highs
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