Mo. Rev. Stat. § 400.9-327: Priority of secured interests in deposit account.

The following rules govern priority among conflicting security interests in the same deposit account:

(1) A security interest held by a secured party having control of the deposit account under section 400.9-104 has priority over a conflicting security interest held by a secured party that does not have control.

(2) Except as otherwise provided in paragraphs (3) and (4), security interests perfected by control under section 400.9-314 rank according to priority in time of obtaining control.

(3) Except as otherwise provided in paragraph (4), a security interest held by the bank with which the deposit account is maintained has priority over a conflicting security interest held by another secured party.

(4) A security interest perfected by control under section 400.9-104(a)(3) has priority over a security interest held by the bank with which the deposit account is maintained.