A mutual insurance company is an insurance company owned entirely by its policyholders. It is a form of consumers' co-operative. Any profits earned by a mutual insurance company are either retained within the company or rebated to policyholders in the form of dividend distributions or reduced future premiums. In contrast, a stock insurance company is owned by investors who have purchased company stock; any profits generated by a stock insurance company are distributed to the investors without necessarily benefiting the policyholders.