Mo. Rev. Stat. § 513.125

When any rights or shares of stock in any bank, association, joint stock company or corporation shall be sold, the officer making such sale shall execute an instrument in writing, reciting the sale and payment of the consideration, and conveying to the purchaser such rights and shares, and shall also leave with the cashier, secretary or chief clerk, or, if there be none, with any other officer of such bank, association, joint stock company or corporation, a copy of the execution and his return thereon; and the purchaser shall thereupon be entitled to all dividends and stock, and to the same privileges as a member of such company or corporation as such debtor was entitled to.