Mo. Rev. Stat. § 376.190
The director shall annually cause the registered policies and annuity bonds of each company outstanding and in force to be carefully valued, and whenever the total of the actual net value of such policies and annuity bonds exceeds the market value of the securities on deposit, the company issuing such policies or annuity bonds shall immediately deposit sufficient securities of the same kind and type provided for in sections 376.291 to 376.307 to equal the net value of such policies and annuity bonds so that the market value of the securities deposited shall always be equal to the actual net value of the registered policies and annuity bonds issued by such company and still in force.
§ 376.190, RSMo
RSMo 1939 § 5817, A.L. 1951 p. 275, A.L. 1961 p. 170, A.L. 2007 S.B. 66