Wis. Stat. § 891.20
Except as provided in s. 180.0203(2), any charter or patent of incorporation which shall have been issued by the governor, secretary of state or department of financial institutions, or by any combination, to any corporation under any law of the state; any certificate of organization or association of any corporation or joint stock company; the articles of organization of a limited liability company; the articles of association or organization of any corporation, or a certified copy thereof, which shall have been filed or recorded in the office of the secretary of state or with the department of financial institutions, or recorded in the office of any register of deeds or filed or recorded in the office of any clerk of the circuit court under any law of the state; any certificate or resolution for the purpose of amendment, and every amendment in any form, of the charter, patent, certificate or articles of association or organization or of the name, corporate powers or purposes of any corporation or limited liability company, filed or recorded in any of the departments or offices and a certified copy of any such document so filed or recorded shall be received as conclusive evidence of the existence of the corporation, limited liability company or joint stock company mentioned therein, or of the due amendment of the charter, patent, certificate or articles of association or organization thereof in all cases where such facts are only collaterally involved; and as presumptive evidence thereof and of the facts therein stated in all other cases.
Wis. Stat. § 891.20