Mo. Rev. Stat. § 521.250
Shares of stock in any bank, association, joint-stock company or corporation, belonging to any defendant in any writ of attachment, may be attached in the same manner as the same may be levied upon under execution.
(RSMo 1939 § 1457)
Prior revisions: 1929 § 1293; 1919 § 1744; 1909 § 2313