Md. Code, Corporations and Associations § 12–302

(a) Except as provided in the governing instrument of a statutory trust, the beneficial owners shall be entitled to the same limitation of personal liability extended to stockholders of a Maryland corporation formed under Title 2 of this article.

(b) (1) Neither an obligation of a beneficial owner or trustee of a statutory trust to the statutory trust arising under the governing instrument or a separate agreement in writing, or a note, instrument, or other writing evidencing any such obligation of a beneficial owner or trustee, shall be subject to the defense of usury.

(2) A beneficial owner or trustee may not interpose the defense of usury with respect to any obligation identified in paragraph (1) of this subsection in any action.