Washington UCC Financing Statement Addendum is a document used to supplement and amend an existing UCC Financing Statement. It is required by the Washington State Department of Financial Institutions in order to perfect a security interest in personal property. There are three types of Washington UCC Financing Statement Addendum: Addendum A — Assignment of Security Interest, Addendum B — Continuation of Security Interest, and Addendum C — Termination of Security Interest. The Addendum A must be used when the original secured party transfers their security interest to another party. The Addendum B must be used to extend the effectiveness of the original UCC Financing Statement past its original expiration date. The Addendum C must be used to terminate the effectiveness of the original UCC Financing Statement.