The XLK rose 0.96% (+1.73 pts) on the day, and 63% of that gain came from just three stocks: NVDA, AMD, MU.
Read the latest market-close note: Nvidia and Goldman Sachs Lead a Narrow Advance as Energy and Staples Slide
NVIDIA CORP and FLEX LTD moved almost identically (+2.19% vs +2.44%), yet NVDA moved the XLK 47.5× 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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