Section 400.9-501 - Filing office(a) Except as otherwise provided in subsection (b), if the local law of this state governs perfection of a security interest or agricultural lien, the office in which to file a financing statement to perfect the security interest or agricultural lien is: (1) The office designated for the filing or recording of a record of a mortgage on the related real property, if: (A) The collateral is as-extracted collateral or timber to be cut; or(B) The financing statement is filed as a fixture filing and the collateral is goods that are or are to become fixtures; or(2) The office of the secretary of state in all other cases, including a case in which the collateral is goods that are or are to become fixtures and the financing statement is not filed as a fixture filing.(b) The office in which to file a financing statement to perfect a security interest in collateral, including fixtures, of a transmitting utility is the office of the secretary of state. The financing statement also constitutes a fixture filing as to the collateral indicated in the financing statement which is or is to become fixtures.Amended by 2018 Mo. Laws, HB 1769,s A, eff. 8/28/2018.Amended by 2016 Mo. Laws, HB 2332,s A, eff. 1/1/2017.L. 1963 p. 503 § 9-501, A.L. 1988 S.B. 583, A.L. 2001 S.B. 288, A.L. 2014H.B. 1412