§9–310.

    (a)    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.

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

        (1)    That is perfected under § 9-308(d), (e), (f), or (g);

        (2)    That is perfected under § 9-309 when it attaches;

        (3)    In property subject to a statute, regulation, or treaty described in § 9-311(a);

        (4)    In goods in possession of a bailee which is perfected under § 9-312(d)(1) or (2);

        (5)    In certificated securities, documents, goods, or instruments which is perfected without filing, control, or possession under § 9-312(e), (f), or (g);

        (6)    In collateral in the secured party’s possession under § 9-313;

        (7)    In a certificated security which is perfected by delivery of the security certificate to the secured party under § 9-313;

        (8)    In deposit accounts, electronic chattel paper, electronic documents, investment property, or letter-of-credit rights which is perfected by control under § 9-314;

        (9)    In proceeds which is perfected under § 9-315; or

        (10)    That is perfected under § 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.