The XLK rose 39.38% (+56.16 pts) over the past six months in a broad advance: 63 of 75 stocks rose, with AMD out front at +7.08 points.
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APPLE INC and GEN DIGITAL INC moved almost identically (+29.36% vs +30.63%), yet AAPL moved the XLK 543.5× 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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