The XLK rose 31.15% (+47.21 pts) over five years, and more than all of that gain came from just three stocks: AAPL, NVDA, AVGO.
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NVIDIA CORP and SUPER MICRO COMPUTER INC moved almost identically (+1,008.97% vs +1,020.62%), yet NVDA moved the XLK 168.7× as much. In a cap-weighted index, the bigger company's weight turns the same percentage move into far more points.
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