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Using eight years of recent reconstitution history, we study the behavior of Russell 3000 additions and deletions on the day when the benchmark composition and weights are determined. We document evidence of strategic predatory trading, whereby closing prices of some securities on this day appear to be manipulated with the objective of influencing the resulting membership weight in the index. Specifically, we find that for the securities most likely to be targets of such trading (additions thatdoi:10.2139/ssrn.1101341 fatcat:owvawtfddfgsppc7y4fjwwbici