Md. Code, Insurance § 9–208

A delinquency proceeding may be brought against:

(1) an insurer that is doing or has done insurance business in the State and against whom claims arising from that insurance business may exist now or in the future;

(2) a person that purports to do insurance business in the State;

(3) an insurer that has insureds resident or located in the State;

(4) a person organized, or in the process of organizing, with intent to do insurance business in the State;

(5) a corporation that operates a nonprofit health service plan under Title 14, Subtitle 1 of this article; and

(6) a person that does, or has done, any of the acts of an insurance business specified in § 4-205 of this article.