It is unlawful for any investment adviser to enter into, extend, or renew any investment advisory contract unless it provides in writing:
"Assignment", as used in subsection (2) of this section, includes any direct or indirect transfer or hypothecation of an investment advisory contract by the assignor or of a controlling block of the assignor's outstanding voting securities by a security holder of the assignor; but, if the investment adviser is a partnership, no assignment of an investment advisory contract is considered to result from the death or withdrawal of a minority of the members of the investment adviser having only a minority interest in the business of the investment adviser, or from the admission to the investment adviser of one or more members who, after admission, will be only a minority of the members and will have only a minority interest in the business.
RCW 21.20.030