The XLV rose 10.35% (+16.02 pts) so far this year on a mixed tape; JNJ, MRK, LLY did most of the lifting, with 54% of the gain between them.
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ELI LILLY + CO and CVS HEALTH CORP moved almost identically (+10.05% vs +10.38%), yet LLY moved the XLV 191.6× 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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