N.C. Gen. Stat. § 25-9-310

(1) General rule: perfection by filing. - Except as otherwise provided in subsection (b) of this section and G.S. 25-9-312(b), a financing statement must be filed to perfect all security interests and agricultural liens.

(2) Exceptions: filing not necessary. - The filing of a financing statement is not necessary to perfect a security interest: That is perfected under G.S. 25-9-308(d), (e), (f), or (g);

(3) That is perfected under G.S. 25-9-309 when it attaches;

(4) In property subject to a statute, regulation, or treaty described in G.S. 25-9-311(a);

(5) In goods in possession of a bailee which is perfected under G.S. 25-9-312(d)(1) or (2);

(6) In certificated securities, documents, goods, or instruments which is perfected without filing, control, or possession under G.S. 25-9-312(e), (f), or (g);

(7) In collateral in the secured party's possession under G.S. 25-9-313;

(8) In a certificated security which is perfected by delivery of the security certificate to the secured party under G.S. 25-9-313;

(9) In deposit accounts, electronic chattel paper, electronic documents, investment property, or letter-of-credit rights which is perfected by control under G.S. 25-9-314;

(10) In proceeds which is perfected under G.S. 25-9-315; or

(11) That is perfected under G.S. 25-9-316.

(12) 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.