When filing required to perfect security interest or agricultural lien; security interests and agricultural liens to which filing provisions do not apply
Wis. Stat. § 409.310
in effect(1) General rule: perfection by filing. Except as otherwise provided in sub. (2) and s. 409.312 (2), a financing statement must be filed to perfect all security interests and agricultural liens.
(2) Exceptions: filing not necessary. The filing of a financing statement is not necessary to perfect a security interest:
(a) That is perfected under s. 409.308 (4), (5), (6), or (7);
(b) That is perfected under s. 409.309 when it attaches;
(c) In property subject to a statute, regulation, or treaty described in s. 409.311 (1);
(d) In goods in possession of a bailee which is perfected under s. 409.312 (4) (a) or (b);
(e) In certificated securities, documents, goods, or instruments which is perfected without filing, control, or possession under s. 409.312 (5), (6), or (7);
(f) In collateral in the secured party’s possession under s. 409.313;
(g) In a certificated security which is perfected by delivery of the security certificate to the secured party under s. 409.313;
(h) In deposit accounts, electronic chattel paper, electronic documents, investment property, or letter-of-credit rights which is perfected by control under s. 409.314;
(i) In proceeds which is perfected under s. 409.315; or
(j) That is perfected under s. 409.316.
(3) Assignment of perfected security interest. If a secured party assigns a perfected security interest or agricultural lien, a filing under this chapter is not required to continue the perfected status of the security interest against creditors of and transferees from the original debtor.
Source: WI Statutes (Official Site)URL: https://docs.legis.wisconsin.gov/document/statutes/409.310Fetched: 10/7/2026