1. Except as otherwise provided in subsection 2 and subsection 2 of section 41-09-32, a financing statement must be filed to perfect all security interests and agricultural liens.
2. The filing of a financing statement is not necessary to perfect a security interest:
a. That is perfected under subsection 4, 5, 6, or 7 of section 41-09-28;
b. That is perfected under section 41-09-29 when it attaches;
c. In property subject to a statute, regulation, or treaty described in subsection 1 of section 41-09-31;
d. In goods in possession of a bailee which is perfected under subdivision a or b of subsection 4 of section 41-09-32;
e. In certificated securities, documents, goods, or instruments which is perfected without filing, control, or possession under subsection 5, 6, or 7 of section 41-09-32;
f. In collateral in the secured party's possession under section 41-09-33;
g. In a certificated security which is perfected by delivery of the security certificate to the secured party under section 41-09-33;
h. In controllable accounts, controllable electronic records, controllable payment intangibles, deposit accounts, electronic documents, investment property, letter-of-credit rights, or uncertificated certificates of deposit, which is perfected by control under section 41-09-34;
i. In chattel paper which is perfected by possession and control under section 41-09-34.1">41-09-34.1;
j. In proceeds which is perfected under section 41-09-35;
k. That is perfected under section 41-09-36; or l. In agricultural liens created by chapter 35-17, 35-30, or 35-31.
3. If a secured party assigns a perfected security interest or agricultural lien, a filing under this chapter is not required to continue the perfected status of the security interest against creditors of and transferees from the original debtor.