Mo. Rev. Stat. § 362.172: Investment in stock of banks or bank holding companies — limitations.

Any bank organized under the laws of this state may invest not to exceed five percent of its capital, surplus and undivided profits in shares of stock in any new bank or banks, existing bank or banks, or bank holding companies if the ownership of a majority of such stock in such bank or bank holding companies is restricted to banks authorized to do business in the state of Missouri.