(a) General rule; perfection by filing. Except as otherwise provided in subsection (b) of this Code section and subsection (b) of Code Section 11-9-312, 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 subsection (d), (e), (f), or (g) of Code Section 11-9-308;

(2) That is perfected under Code Section 11-9-309 when it attaches;

(3) In property subject to a statute, regulation, or treaty described in subsection (a) of Code Section 11-9-311;

(4) In goods in possession of a bailee which is perfected under paragraph (1) or (2) of subsection (d) of Code Section 11-9-312;

(5) In certificated securities, documents, goods, or instruments which is perfected without filing or possession under subsection (e), (f), or (g) of Code Section 11-9-312;

(6) In collateral in the secured party's possession under Code Section 11-9-313;

(7) In a certificated security which is perfected by delivery of the security certificate to the secured party under Code Section 11-9-313;

(8) In deposit accounts, electronic chattel paper, investment property, or letter of credit rights which is perfected by control under Code Section 11-9-314;

(9) In proceeds which is perfected under Code Section 11-9-315; or

(10) That is perfected under Code Section 11-9-316.

(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.