Corp. Code, § 13406

(a) Subject to the provisions of subdivision (b), shares of capital stock in a professional corporation may be issued only to a licensed person or to a person who is licensed to render the same professional services in the jurisdiction or jurisdictions in which the person practices, and any shares issued in violation of this restriction shall be void. Unless there is a public offering of securities by a professional corporation or by a foreign professional corporation in this state, its financial statements shall be treated by the Commissioner of Financial Protection and Innovation as confidential, except to the extent that such statements shall be subject to subpoena in connection with any judicial or administrative proceeding, and may be admissible in evidence therein. A shareholder of a professional corporation or of a foreign professional corporation qualified to render professional services in this state shall not enter into a voting trust, proxy, or any other arrangement vesting another person (other than another person who is a shareholder of the same corporation) with the authority to exercise the voting power of any or all of the shareholder’s shares, and any purported voting trust, proxy, or other arrangement shall be void.

(b) A professional law corporation may be incorporated as a nonprofit public benefit corporation under the Nonprofit Public Benefit Corporation Law under either of the following circumstances:

(1) The corporation is a qualified legal services project or a qualified support center within the meaning of subdivisions (a) and (b) of Section 6213 of the Business and Professions Code.

(2) The professional law corporation otherwise meets all of the requirements and complies with all of the provisions of the Nonprofit Public Benefit Corporation Law, as well as all of the following requirements:

(A) All of the members of the corporation, if it is a membership organization as described in the Nonprofit Corporation Law, are persons licensed to practice law in California.

(B) All of the members of the professional law corporation’s board of directors are persons licensed to practice law in California.

(C) Seventy percent of the clients to whom the corporation provides legal services are lower income persons as defined in Section 50079.5 of the Health and Safety Code, and to other persons who would not otherwise have access to legal services.

(D) The corporation shall not enter into contingency fee contracts with clients.

(c) A professional law corporation incorporated as a nonprofit public benefit corporation that is a recipient in good standing as defined in subdivision (c) of Section 6213 of the Business and Professions Code shall be deemed to have satisfied all of the filing requirements of a professional law corporation under Sections 6161.1, 6162, and 6163 of the Business and Professions Code.