For anyone wondering exactly how much QQQ and VOO/SPY actually overlap, here is the math.

If you are holding both QQQ (Nasdaq-100) and an S&P 500 fund (like VOO or SPY) thinking you are diversifying, you might want to look at the actual overlap. Here is the exact breakdown of how much of QQQ is already sitting inside the S&P 500: 1. The Stock Count Overlap Total Tickers in QQQ: ~105 (due to dual-share classes like Google). Stocks also in S&P 500: 86 positions. The Math: ~83% of the individual companies in QQQ are already inside the S&P 500. 2. The Weight Overlap (Wher

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