The XLF rose 0.92% (+0.50 pts) on the day, but 42 of 74 members went the other way. V and MA carried the tape higher, accounting for 54% of the gain.
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VISA INC CLASS A SHARES and BLOCK INC moved almost identically (+2.76% vs +2.68%), yet V moved the XLF 12.7× 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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