(a) General rule: perfection by filing. Except as otherwise provided in subsection (b) and section 336.9-312(b), a financing statement must be filed to perfect all security interests and agricultural liens.

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(b) Exceptions: filing not necessary. The filing of a financing statement is not necessary to perfect a security interest:

(1) that is perfected under section 336.9-308(d), (e), (f), or (g);

(2) that is perfected under section 336.9-309 when it attaches;

(3) in property subject to a statute, regulation, or treaty described in section 336.9-311(a);

(4) in goods in possession of a bailee which is perfected under section 336.9-312(d)(1) or (2);

(5) in certificated securities, documents, goods, or instruments which is perfected without filing, control, or possession under section 336.9-312(e), (f), or (g);

(6) in collateral in the secured party’s possession under section 336.9-313;

(7) in a certificated security which is perfected by delivery of the security certificate to the secured party under section 336.9-313;

(8) in deposit accounts, electronic chattel paper, electronic documents, investment property, or letter of credit rights which is perfected by control under section 336.9-314;

(9) in proceeds which is perfected under section 336.9-315; or

(10) that is perfected under section 336.9-316.

(c) Assignment of perfected security interest. 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.