Mo. Rev. Stat. § 383.203: Rates filed with director — form — open to public, copies.

1. Every insurer shall file with the director all rates and supplementary rate information which is to be used in this state. Such rates and supplementary rate information shall be filed before use.

2. Rates filed pursuant to this section shall be filed in such form and manner as prescribed by the director. Whenever a filing is not accompanied by such information as the director has required under this section, the director shall so inform the insurer within thirty days.

3. All rates and supplementary rate information shall, as soon as filed, be open to public inspection at any reasonable time. Copies may be obtained by any person on request and upon payment of a reasonable charge.