While your company has rights over all material created by your employees within your business, a whole new standard is at play when you contract another company to create copyrightable works. For example, if you contract a graphic design company to create a logo for your company, you only have the rights to that work if the third-party signs an agreement that gives you those rights.
This agreement is more than the simple receipt that the designers may give you upon the completion of their work. This is because your company does not own the work simply because its creation was paid for by you. Such work is the property of the artist/design company until they sign an agreement giving the copyrights to the person who contracted the work.
This issue of copyright ownership is why it is so important for companies who are planning to contract a third-party to consult an attorney before any deal is made. With the help of an attorney an effective agreement can be drafted that leaves your company free to use the work in any way it pleases. Without such help, it is easy to find your company forced to seek permission or negotiate a license agreement in order to use the work.