Mo. Rev. Stat. § 507.010: Prosecution in name of real party in interest.

Every action shall be prosecuted in the name of the real party in interest, but an executor, administrator, personal representative, guardian, conservator, trustee of an express trust, a party with whom or in whose name a contract has been made for the benefit of another, or a party authorized by statute may sue in his own name in such representative capacity without joining with him the party for whose benefit the action is brought; and when a statute so provides, an action for the use or benefit of another shall be brought in the name of the state of Missouri.