a. General rule; perfection by filing. Except as otherwise provided in subsection (b) and § 8.9A-312 (b), a financing statement must be filed to perfect all security interests and agricultural liens.
b. Exceptions; filing not necessary. The filing of a financing statement is not necessary to perfect a security interest:
1. that is perfected under § 8.9A-308 (d), (e), (f), or (g);
2. that is perfected under § 8.9A-309 when it attaches;
3. in property subject to a statute, regulation, or treaty described in § 8.9A-311 (a);
4. in goods in possession of a bailee that is perfected under § 8.9A-312 (d) (1) or (2);
5. in certificated securities, documents, goods, or instruments that is perfected without filing, control, or possession under § 8.9A-312 (e), (f), or (g);
6. in collateral in the secured party’s possession under § 8.9A-313;
7. in a certificated security which is perfected by delivery of the security certificate to the secured party under § 8.9A-313;
8. in controllable accounts, controllable electronic records, controllable payment intangibles, deposit accounts, electronic documents, investment property, or letter-of-credit rights which is perfected by control under § 8.9A-314; (8.1) in chattel paper which is perfected by possession and control under § 8.9A-314.1.
9. in proceeds which is perfected under § 8.9A-315; or
10. that is perfected under § 8.9A-316.
c. Assignment of perfected security interest. If a secured party assigns a perfected security interest or agricultural lien, a filing under this title is not required to continue the perfected status of the security interest against creditors of and transferees from the original debtor.