Supervisor Accounts Report ?

Summary

Can I run a report on listed Supervisor Accounts?

Content

I'm looking to clean up Supervisor Accounts. For whatever reason, our integration wasn't configured to remove users from Supervisor Accounts once they left the company. I figured out how to remove them via the bulk loader but is there a report I can run that lists all the current Supervisor accounts? 

I am aware of a Supervisor Mapping report- but I'm looking to isolate the accounts that are listed under supervisor accounts. (Without having to copy and paste several pages into Excel)