Mo. Rev. Stat. § 376.296

The value or amount of an investment acquired or held or an investment practice engaged in under this chapter, unless otherwise specified in this code, shall be the value at which assets of an insurer are required to be reported for statutory accounting purposes as determined in accordance with procedures prescribed in published accounting and valuation standards of the NAIC, including the Purposes and Procedures of the Securities Valuation Office, the Valuation of Securities Manual, the Accounting Practices and Procedures Manual, the Annual Statement Instructions, or any successor valuation procedures officially adopted by the NAIC.