D.C. Mun. Regs. tit. 17, § 8906
8906.1 No person carrying on, conducting, or transacting business under a trade name shall be entitled to file an action under that trade name in a District court until the person has properly completed the registration with the Superintendent according to this chapter.
8906.2 A person's failure to properly register a trade name shall not impair the validity of a contract or act of such person and shall not prevent such person from defending a suit in a District court.
SOURCE: Final Rulemaking published at 49 DCR 10075 (November 8, 2002); as amended by Final Rulemaking published at 63 DCR 878 (January 22, 2016).