Write an email with the following subject:

Existing Trading Track Rotations
Attached is the current list of rotations for the Trading Track participants and future assigned rotations (as decided at the time of hiring). Can you please re-confirm you have these people in your group currently, as I appear to have conflicting information. I will re-send, if any changes occur. If there is any movement of these people between groups can you plese keep me in the loop. Kind regards,