Wis. Stat. § 180.1811: Transfer of shares in breach of transfer restrictions.

(1) An attempted transfer of shares in a statutory close corporation in violation of a transfer restriction that is binding on the transferee is ineffective.

(2) An attempted transfer of shares in a statutory close corporation in violation of a transfer restriction that is not binding on the transferee, either because the corporation fails to give written notice under s. 180.1809 or because a court orders that the restriction prohibiting the transfer is unenforceable, gives the corporation the option to purchase the shares from the transferee for the same price paid and terms agreed to by the transferee. To exercise the option, the corporation shall give the transferee written notice that complies with s. 180.0141 and shall make payment within 75 days after the shares are presented for registration in the transferee’s name.