Which type of insurer is not licensed to transact insurance in Michigan?

Unauthorized insurers are those that do not hold a license to operate in a particular state, which in this case is Michigan. These insurers have not met the requirements set by the state's insurance regulatory authority, such as demonstrating financial stability, filing necessary documents, or adhering to local laws. Hence, they are prohibited from offering insurance coverage within Michigan's jurisdiction.

In contrast, authorized insurers are those that have received the necessary licensing and comply with state regulations, enabling them to legally conduct insurance business in Michigan. Mutual companies are a specific type of authorized insurer owned by their policyholders, and domestic insurers are insurers that are incorporated or organized under Michigan state laws. Both mutual and domestic insurers are fully licensed entities permitted to operate within the state.