Mont. Code Ann. § 33-2-106

33-2-106 . General eligibility of insurers. (1) To qualify for and hold authority to transact insurance in this state, an insurer must be otherwise in compliance with this code and with its charter powers and must be an incorporated stock insurer, an incorporated mutual insurer, or a reciprocal insurer, all of the same general type as may hereafter be formed as a domestic insurer under this code.

(2) No foreign insurer shall be authorized to transact insurance in Montana which does not maintain reserves as required by part 5 of this chapter applicable to the kind or kinds of insurance transacted by such insurer, wherever transacted in the United States, or which transacts business anywhere in the United States on the assessment plan, stipulated premium plan, or any similar plan.

(3) No foreign insurer which is directly or indirectly owned or controlled in whole or in substantial part by any government or governmental agency shall be authorized to transact insurance in Montana unless it was so owned and first so authorized prior to January 1, 1957. Membership or subscribership in a mutual or reciprocal insurer by virtue of being a policyholder thereof, ownership of stock or other security which does not have voting rights with respect to the management of the insurer, or supervision of an insurer by public authority shall not be deemed to be an ownership or control of the insurer for the purposes of this provision.