(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 that 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 that 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, virtual currencies, or letter-of-credit rights that is perfected by control under § 9.314;
(9) in proceeds that 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 Chapter is not required to continue the perfected status of the security interest against creditors of and transferees from the original debtor.