Mo. Rev. Stat. § 351.572: Authority to transact business required.

1. A foreign corporation may not transact business in this state until it obtains a certificate of authority from the secretary of state.

2. The following activities, among others, do not constitute transacting business within the meaning of subsection 1 of this section:

(1) Maintaining, defending, or settling any proceeding;

(2) Holding meetings of the board of directors or shareholders or carrying on other activities concerning internal corporate affairs;

(3) Maintaining bank accounts;

(4) Maintaining offices or agencies for the transfer, exchange, and registration of the corporation's own securities or maintaining trustees or depositories with respect to those securities;

(5) Creating or acquiring indebtedness, mortgages, and security interests in real or personal property;

(6) Securing or collecting debts or enforcing mortgages and security interests in property securing the debts;

(7) Conducting an isolated transaction that is completed within thirty days and that is not one in the course of repeated transactions of a like nature;

(8) Transacting business in interstate commerce.

3. The list of activities in subsection 2 of this section is not exhaustive.