Usually not, but watch out for registrars that charge a fee to transfer the names to a new owner. Most of the popular registrars offer free pushes to a new owner. Even Network Solutions offers this now.
Register.com comes to mind for their $200 fee for ownership transfers. They also have been very difficult for me to transfer domains away from, so I personally try to avoid purchasing domains that are registered there. Joker.Com is another one that both ownership changes and transfers away are difficult.
Generally though if a registrar makes it difficult to transfer a domain or charges a fee, you can opt to transfer the name to a different registrar prior to doing an ownership change.