Cal. Bus. & Prof. Code § 5157
The board may formulate and enforce rules and regulations to carry out the purposes and objectives of this article, including rules and regulations requiring (a) that the articles of incorporation or bylaws of an accountancy corporation shall include a provision whereby the capital stock of such corporation owned by a disqualified person (as defined in the Moscone-Knox Professional Corporation Act), or a deceased person, shall be sold to the corporation or to the remaining shareholders of such corporation within such time as such rules and regulations may provide, and (b) that an accountancy corporation as a condition of obtaining a certificate pursuant to the Moscone-Knox Professional Corporation Act and this article shall provide adequate security by insurance or otherwise for claims against it by its clients arising out of the rendering of professional services.
Ca. Bus. and Prof'l. Code § 5157