Wis. Stat. § 705.27
Subject to the rights of the registering entity under s. 705.28(2m), on the death of a sole owner or the last to die of multiple owners, ownership of securities registered in beneficiary form passes to the beneficiary or beneficiaries who survive all owners and to any predeceased beneficiary's issue who would take under s. 854.06(3). On proof of death of all owners and compliance with any applicable requirements of the registering entity, a security registered in beneficiary form may be reregistered in the name of the successors to the ownership interest. Until division of the security after the death of all owners, multiple successors to the ownership interest hold their interests as tenants in common. If no beneficiary or predeceased beneficiary's issue who would take under s. 854.06(3) survives the death of all owners, the security belongs to the estate of the deceased sole owner or the estate of the last to die of multiple owners.
Wis. Stat. § 705.27