Mont. Code Ann. § 33-2-1512

In addition to any other required loss reserve certification, the controlled insurer shall, on April 1 of each year, file with the commissioner an opinion of an independent casualty actuary or other independent loss reserve specialist acceptable to the commissioner. The opinion must report the loss ratios for each line of business written and must attest to the adequacy of loss reserves established for losses incurred and outstanding as of the yearend, including losses incurred but not reported, on business placed by the producer.