(B) a person who is not otherwise a vendor who owns tangible personal property located on the premises of an unaffiliated person performing fulfillment services for such person.
For purposes of this subparagraph, persons are affiliated persons with respect to each other where one of such persons has an ownership interest of more than five percent, whether direct or indirect, in the other, or where an ownership interest of more than five percent, whether direct or indirect, is held in each of such persons by another person or by a group of other persons which are affiliated persons with respect to each other.