Security Deposit Hold Reports

Is there a report that can be run to show who has, and who has NOT, put a card on file for a Security Deposit?

I am having some trouble tracking this so I can remind people in a timely fashion.

There's not a standalone report, but you can certainly get that information.  Go to the main Bookings display, choose List view, and use the Filters appropriately, with particular attention to the Security Deposit Status option selection.