Cal. Ins. Code § 4012

Domestic mutual insurers, incorporating or qualifying to transact any or all of the classes of insurance designated in Sections 100 through 123 and 700. 01, shall be subject to all provisions of this code applicable to other incorporated insurers, except where otherwise provided. Domestic mutual insurers shall not be required to have or issue capital stock or shares nor shall they be required to distribute an annual report to a member other than at the time of the initial policy issuance or once each year on renewal. The provisions of Section 1140 shall apply to such an insurer except that the provisions of the Corporation Law referring to shareholders or members shall be applied as though such provisions referred to the policyholders or members of a mutual.