FedEx is one of the largest courier companies in the world, and it employs thousands of independent contractors to help fulfill its delivery needs. While FedEx does not explicitly state that it does not hire independent contractors, it is clear that the company hires an overwhelmingly majority of its workers through independent contractors.
This is likely because contracting out allows FedEx to rapidly and inexpensively respond to changing customer needs, and it also allows the company to keep a close eye on its workers. While some workers may view this arrangement as exploitative, it is likely that FedEx enjoys a reputation for treating its contractors fairly and providing them with a good level of job security.