D.C. Mun. Regs. tit. 17, § 8904
8904.1 Signature or signatures shall be required on the application for trade name registration of the authorized person or persons of the business entity including but not limited to the following types of business relationships:
(a) The sole proprietor of a sole proprietorship; or
(b) A partner of a foreign or domestic general or limited partnership; or
(c) A general partner of a foreign or domestic limited liability partnership; or
(d) An organizer or managing member of a foreign or domestic limited liability company; or
(e) An incorporator, director, or officer of a foreign or domestic corporation.
SOURCE: As amended by Final Rulemaking published at 49 DCR 10075 (November 8, 2002).