Maryland Code, Corporations and Associations § 2-212

(a) Each stock certificate shall be signed by the president, a vice president, the chief executive officer, the chief operating officer, the chief financial officer, the chairman of the board, or the vice chairman of the board and countersigned by the secretary, an assistant secretary, the treasurer, an assistant treasurer, or any other officer.

(b) Each certificate which represents any stock, bond, note, guaranty, obligation, or other corporate security:

(c) A certificate described in this section is valid and may be issued whether or not an officer who signed it is still an officer when it is issued.