Index funds are price-insensitive. When FTSE Russell reconstitutes its US indices at the end of June, every fund tracking the Russell 2000 must buy each addition and sell each deletion — in size, on the same day, at whatever price the close prints. That is a forced, rules-based flow you can see coming weeks ahead. This desk reconstructs the Russell map from live market caps and projects the four reconstitution events that pay, scoring each by how many days of normal volume the passive funds must absorb.