Transfer agent ComputerShare is the official record keeper of shares for many companies including Wal-Mart, McDonalds, Jack in the Box, Gamestop, and many more. Rather than going through a 3rd party (broker) to obtain shares, investors can have the shares directly registered under their name via transfer agent.
For Gamestop, this would Computershare. As the official record keeper of shares for Gamestop, this means Computershare is the only entity that can provide an exact count of directly registered shares.