Wis. Stat. § 214.59: Prohibited activities.

(1) A savings bank may not participate, directly or indirectly, in the sale or transfer of any equity or debt security or instrument of an affiliate, its parent savings bank holding company or an affiliate of the savings bank holding company.

(2) A shareholder, director, officer, employee or agent of the savings bank may not participate, directly or indirectly, in any sale or transfer described in sub. (1), nor may that person allow any other person to do so at an office of the savings bank or any office of the savings bank’s subsidiaries or service corporations.