Flagship research
What membership does to a stock
+410 +410 95% CI [+290, +552] Pre-announcement run-up (selection-list). Placebo q=1.00; bootstrap CI excludes 0. Authors' calculations (paper, Sections 3–4) bps
median pre-announcement run-up
A two-paper event study across 1,219 1,219 Constituent-change events in the study panel. Authors' calculations (paper, Section 2) SXXP rebalancing events. The market front-runs STOXX’s rule-based reconstitution list; the second paper finds that membership moves the beta you measure rather than the stock you hold, while additions gain +26.2% +26.2% exp(mean Δlog turnover)−1, printed as a MEAN shift; genuine (price-free) turnover rise on additions; n=278 Authors' calculations (see paper) in genuine turnover.
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