Mich. Comp. Laws § 500.1324
An insurer that is a member of an insurance holding company system and is authorized to do business in this state shall register with the commissioner. A foreign insurer is not required to register if it is subject to disclosure requirements and standards adopted by statute or regulation in the jurisdiction of its domicile that are substantially similar to those contained in this section and sections 1325 to 1343 and that exempt insurers domiciled in this state from the requirements of registration or that permit insurers domiciled in this state to satisfy the registration requirement by filing copies of materials required to be filed under this chapter. An insurer subject to registration under this chapter shall register by May 1 of each year for the immediately preceding calendar year unless the commissioner for good cause shown extends the time for registration. The commissioner may require an authorized insurer that is a member of a holding company system not subject to registration under this section to furnish a copy of the registration statement or other information filed by the insurer with the insurance regulatory authority of domiciliary jurisdiction.
MCL 500.1324