C.R.S. § 4-9-310

(a) Except as otherwise provided in subsection (b) of this section and section 4-9-312 (b), a financing statement must be filed to perfect all security interests and agricultural liens. (b) The filing of a financing statement is not necessary to perfect a security interest: (1) That is perfected under section 4-9-308 (d), (e), (f), or (g); (2) That is perfected under section 4-9-309 when it attaches; (3) In property subject to a statute, regulation, or treaty described in section 4-9-311 (a); (4) In goods in possession of a bailee which is perfected under section 4-9-312 (d)(1) or (2); (5) In certificated securities, documents, goods, or instruments that is perfected without filing, control, or possession under section 4-9-312 (e), (f), or (g); (6) In collateral in the secured party’s possession under section 4-9-313 ; (7) In a certificated security which is perfected by delivery of the security certificate to the secured party under section 4-9-313 ; (8) In controllable accounts, controllable electronic records, controllable payment intangibles, deposit accounts, electronic documents, investment property, or letter-of-credit rights that is perfected by control under section 4-9-314 ; (8.1) In chattel paper that is perfected by possession and control under section 4-9-314.5">4-9-314.5 ; (9) In proceeds which is perfected under section 4-9-315 ; or (10) That is perfected under section 4-9-316 . (c) If a secured party assigns a perfected security interest or agricultural lien, a filing under this article is not required to continue the perfected status of the security interest against creditors of and transferees from the original debtor.