Mo. Rev. Stat. § 388.160: Certificates issued jointly or severally.

Any two or more persons may unite in their subscriptions so as to make the same joint as well as several, and have the certificates of stock issued thereon to them jointly; but in the absence of express agreement to the contrary, all subscriptions shall be several and not joint, and may be sued upon severally in any court of competent jurisdiction, without filing the original subscription list as an exhibit in the cause.