Mont. Code Ann. § 33-9-105

Any mutual, stock, or reciprocal insurer organized under the laws of another state substantially similar to this part for the purpose of transacting the kind of business described in this part may, upon an application and without prior operating experience or examination, be admitted to solicit applications. If the necessary number of applications is obtained, the insurer may do business in this state if the commissioner finds such admission is in the public interest. Thereafter the insurer shall make all reports and be subject to taxation, examination, and supervision by the commissioner to the same extent and in the same manner as are other foreign or alien insurers.