The XLF rose 2.50% (+1.42 pts) on the month on a mixed tape; MA, V, BLK did most of the lifting, with 43% of the gain between them.
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MASTERCARD INC A and INVESCO LTD moved almost identically (+8.61% vs +9.39%), yet MA moved the XLF 26.2× 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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