Washington Revised Code Title 18. Businesses and Professions § 18.100.110. Sale or transfer of shares

No shareholder of a corporation organized as a professional corporation may sell or transfer his or her shares in such corporation except to the trustee of a qualified trust or another individual who is eligible to be a shareholder of such corporation. Any transfer of shares in violation of this section shall be void. However, nothing in this section prohibits the transfer of shares of a professional corporation by operation of law or court decree.