Mont. Code Ann. § 35-2-453

A corporation may purchase and maintain insurance on behalf of an individual who is or was a director, officer, employee, or agent of the corporation or who, while a director, officer, employee, or agent of the corporation, is or was serving at the request of the corporation as a director, officer, partner, trustee, employee, or agent of another foreign or domestic business or nonprofit corporation, partnership, joint venture, trust, employee benefit plan, or other enterprise against liability asserted against or incurred by the individual in that capacity or arising from the individual's status as a director, officer, employee, or agent, whether or not the corporation would have power to indemnify the individual against the same liability under 35-2-447 or 35-2-448.