Mo. Rev. Stat. ยง 494.490
494.490 Number of jurors โ three-fourths or more jurors to return verdict in civil ...
494.490. Number of jurors โ three-fourths or more jurors to return verdict in civil cases โ how verdict is signed. โ In all trials of civil actions before a circuit judge, or an associate circuit judge sitting as a circuit judge, a jury shall consist of twelve persons selected pursuant to sections 494.400 to 494.505 , unless all parties agree on a lesser number, but not less than eight, in which case the number of veniremen shall be reduced accordingly. Three-fourths or more jurors may return a lawful verdict. All verdicts shall be signed by each juror who agrees to the verdict.
(L. 1989 S.B. 127, et al., A.L. 1996 S.B. 869)