Md. Code, Business Regulation § 10–401

(a) Each petroleum transporter shall register with the Comptroller before transporting motor fuel to or from a place in the State.

(b) An applicant for registration shall submit to the Comptroller an application on the form that the Comptroller requires.

(c) The Comptroller shall register and issue a letter of registration to each applicant that meets the requirements of this subtitle.

(d) A petroleum transporter shall notify the Comptroller of each change in registration information within 5 days of the change.