Cal. INS § 1540

Any two or more domestic reciprocal insurers, upon affirmative vote of not less than two-thirds of the subscribers of each such insurer who vote on such merger pursuant to due notice and the prior approval of the commissioner of the terms of such notice, of the manner and form of such voting and of such proposed merger, may merge. The commissioner shall not approve any plan for such merger which is inequitable to subscribers, or in any case where the bylaws or other rules, regulations, power of attorney or other instrument affecting the rights of subscribers of either such reciprocal, has been amended within one year prior to the date of filing with the commissioner of the application for such approval.