The ARKK rose 132.60% (+51.09 pts) over three years in a broad advance: 35 of 41 stocks rose, with TSLA out front at +7.70 points.
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TESLA INC and CERUS CORP moved almost identically (+46.54% vs +50.33%), yet TSLA moved the ARKK 42.5× 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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