Mich. Admin. Code R. 408.41a
Rule 11a. A notice of termination of the liability of an insurance company on a policy covering the risk of an employer under the act must be reported to the agency on form WC-401, or its electronic equivalent, notice of termination of liability. A copy of the notice must be mailed to the employer. If the employer is a partnership, the notice must state the names and addresses of all the partners. If the employer is doing business under an assumed name, the notice must state the assumed name and the names of all parties doing business under the assumed name. If the employer is a corporation doing business under a number of divisions, the notice must state the names of all the divisions of the corporation. If a business changes names notice must be given stating both the new and former names. Notice of termination of a policy which has expired shall not be reported when the insurance carrier has accepted responsibility under a further or renewal policy, except for an assured's name change.
Mich. Admin. Code R. 408.41a