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(a) General rule: perfection by filing. Except as otherwise provided in subsection (b) and § 9–312(b), a financing statement must be filed to perfect all security interests and agricultural liens.\n(b) Exceptions: filing not necessary. The filing of a financing statement is not necessary to perfect a security interest:\n(1) that is perfected under § 9–308(d), (e), (f), or (g);\n(2) that is perfected under § 9–309 when it attaches;\n(3) in property subject to a statute, regulation, or treaty described in § 9–311(a);\n(4) in goods in possession of a bailee which is perfected under § 9–312(d)(1) or (2);\n(5) in certificated securities, documents, goods, or instruments which is perfected without filing or possession under § 9–312(e), (f), or (g);\n(6) in collateral in the secured party's possession under § 9–313;\n(7) in a certificated security which is perfected by delivery of the security certificate to the secured party under § 9–313;\n(8) in deposit accounts, electronic chattel paper, investment property, or letter-of-credit rights which is perfected by control under § 9–314;\n(9) in proceeds which is perfected under § 9–315; or\n(10) that is perfected under § 9–316.\n(c)

l paper, investment property, or letter-of-credit rights which is perfected by control under § 9–314;\n(9) in proceeds which is perfected under § 9–315; or\n(10) that is perfected under § 9–316.\n(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.