The XLF is down 0.06% (−0.04 pts) so far today, but 46 of 76 members went the other way. MS and GS dragged the tape lower, contributing more than the entire move.
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MORGAN STANLEY and INTERACTIVE BROKERS GRO CL A moved almost identically (−1.94% vs −1.76%), yet MS moved the XLF 3.5× 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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