MSCI says 55 securities will be added to and 92 securities will be deleted from the MSCI ACWI index, while there will be 137 additions to and 73 deletions from the MSCI World All Cap Index

Semi-annual index reviews of this kind follow a well-worn sequence: the methodology-driven add/delete lists are published first, index funds and closet trackers then rebalance around the effective date, and the closing auction on implementation day concentrates the flow. The established pattern is that the largest additions see elevated buying into the close and deletions the reverse, with the effect strongest in smaller and less liquid names where tracker demand is a large share of float; in mega caps the flows are routinely absorbed well in advance. The asymmetry between the All Cap list (137 additions) and the ACWI list (92 deletions) reflects the usual dynamic of promotions from the small-cap and emerging universes and deletions where names have drifted below free-float or liquidity thresholds. What has historically mattered next is the pro forma constituent file, which lets desks estimate per-name flow against average daily volume and identify the crowded trades, and any stocks where the rebalance interacts with existing corporate events. Arbitrage desks positioning ahead of the effective date tend to compress the pure rebalancing return, leaving the residual price effect concentrated in the names least anticipated.