Md. Code, Corporations and Associations § 7–103

In addition to any other activities which may not constitute doing intrastate business in this State, for the purposes of this article, the following activities of a foreign corporation do not constitute doing intrastate business in this State:

(1) Maintaining, defending, or settling an action, suit, claim, dispute, or administrative or arbitration proceeding;

(2) Holding meetings of its directors or stockholders or carrying on other activities which concern its internal affairs;

(3) Maintaining bank accounts;

(4) Maintaining offices or agencies for the transfer, exchange, and registration of its securities;

(5) Appointing and maintaining trustees or depositaries with respect to its securities;

(6) Transacting business exclusively in interstate or foreign commerce; and

(7) Conducting an isolated transaction not in the course of a number of similar transactions.