Mo. Rev. Stat. § 511.690: Assignment of judgments.

Judgments of courts of record for the recovery of money may be assigned, in writing, by the plaintiff and the assignees thereof, successively, which assignment shall be on or attached to the judgment, and attested by the clerk of the court or associate circuit judge, and, when so made and attested, shall vest the title to such judgment in each assignee thereof, successively.