Mont. Code § 33-16-105
Every insurer, rating organization, or advisory organization and every group, association, or other organization of insurers which engages in joint underwriting or joint reinsurance shall maintain reasonable records, of the type and kind reasonably adapted to its method of operation, of its experience or the experience of its members and of the data, statistics, or information collected or used by it in connection with the rates, rating plans, rating systems, underwriting rules, policy or bond forms, surveys or inspections made or used by it so that such records will be available at all reasonable times to enable the commissioner to determine whether such organization, insurer, group, or association and, in the case of an insurer or rating organization, every rate, rating plan, and rating system made or used by it complies with the provisions of this chapter applicable to it. The maintenance of such records in the office of a licensed rating organization of which an insurer is a member or subscriber will be sufficient compliance with this section for any insurer maintaining membership or subscribership in such organization, to the extent that the insurer uses the rates, rating plans, rating systems, or underwriting rules of such organization. Such records shall be maintained in an office within this state or shall be made available for examination or inspection within this state by the commissioner at any time upon reasonable notice.
§ 33-16-105, MCA