Mo. Rev. Stat. § 130.048
The internal dissemination by any membership organization, proprietorship, labor organization, corporation, association or other entity, except a committee as defined in section 130.011, of information advocating the election or defeat of a candidate or the passage or defeat of a ballot measure to its members, employees or shareholders, the cost of which is more than two thousand dollars in support of or in opposition to one or more candidates or in support of or in opposition to the qualification or passage of one or more ballot measures in a calendar year, other than a contribution made directly to a candidate or committee, shall be reported in a report signed by the person responsible for making the expenditure or that person's authorized agent. The report shall include the name and address of the person making the expenditure, the date and amount of the expenditure or expenditures, the name and address of the payee and a description of nature and purpose of the dissemination of information. Such report shall be filed with the appropriate officer having jurisdiction over the election of the candidate or ballot measure in question as set forth in section 130.026 no later than fourteen days after the date of making an expenditure. If, after filing such report, additional expenditures are made, a further report shall be filed at the date set forth in section 130.046 for any reporting period in which the additional expenditures are made; except that, such expenditure is made no later than fourteen days prior to an election, the report shall be filed no later than forty-eight hours after the date of such expenditure.
§ 130.048, RSMo