Wis. Stat. § 180.1601: Corporate records.

(1) A corporation shall keep as permanent records any of the following that has been prepared:

(a) Minutes of meetings of its shareholders and board of directors.

(b) Records of actions taken by the shareholders or board of directors without a meeting.

(c) Records of actions taken by a committee of the board of directors in place of the board of directors and on behalf of the corporation.

(2) A corporation shall maintain appropriate accounting records.

(3) A corporation or its agent shall maintain a record of its shareholders, in a form that permits preparation of a list of the names and addresses of all shareholders, by class or series of shares and showing the number and class or series of shares held by each shareholder.

(4) A corporation shall maintain its records in written form or in another form capable of conversion into written form within a reasonable time.