Wis. Stat. § 181.0611: Transfers.

(1) When authorized. Except as set forth in or authorized by the articles of incorporation or bylaws, a member of a corporation may not transfer a membership or any right arising from a membership.

(2) Adoption of restrictions. If transfer rights have been provided, no restriction on them shall be binding with respect to a member holding a membership issued before the adoption of the restriction unless the restriction is approved by the members and the affected member.