Tex. Business & Commerce Code § 9.310

(a) Except as otherwise provided in Subsection (b) and Section 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 Section 9.308(d), (e), (f), or (g);

(2) that is perfected under Section 9.309 when it attaches;

(3) in property subject to a statute, regulation, or treaty described in Section 9.311(a);

(4) in goods in possession of a bailee that is perfected under Section 9.312(d)(1) or (2);

(5) in certificated securities, documents, goods, or instruments which is perfected without filing, control or possession under Section 9.312(e), (f), or (g);

(6) in collateral in the secured party's possession under Section 9.313;

(7) in a certificated security that is perfected by delivery of the security certificate to the secured party under Section 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 Section 9.314;

(9) in proceeds that is perfected under Section 9.315; or

(10) that is perfected under Section 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.