Mo. Rev. Stat. § 130.110: Limitation of cash contributions and anonymous contributions.

Limitations on cash contributions, anonymous contributions:

(1) No contribution in cash in an amount in excess of one hundred dollars shall be made or accepted from any single contributor for any election;

(2) Candidates and candidate committees shall not accept contributions of cash that, in the aggregate, are in excess of one hundred dollars per person per election cycle;

(3) No anonymous contribution in excess of twenty-five dollars shall be made by any person, and no anonymous contributions in excess of twenty-five dollars shall be accepted by any candidate or committee. If any anonymous contribution in excess of twenty-five dollars is received, it shall be returned immediately to the contributor if his or her identity can be ascertained, and if the contributor's identity cannot be ascertained, the candidate or the committee treasurer shall immediately transmit that portion of the contribution which exceeds twenty-five dollars to the state treasurer and it shall escheat to the state.