I had to get a medallion stamp to do an ACATS transfer from broker A to B. I chose to get it at bank C, where I had my checking account, which also happened to own broker D.

Of course, the medallions were handled by a sales guy (sorry, financial advisor) working for broker D who then spent an hour trying to convince me I should move my account to them instead. Eventually he finally gave in and sent off the paperwork.

It's annoying the hoops you have to go through to get control of your own money.