Mo. Rev. Stat. § 351.420

The plan of merger or plan of consolidation shall be submitted to a vote at a meeting of shareholders, which may be either an annual or a special meeting. Written or printed notice stating that the purpose, or one of the purposes, of the meeting is to consider the plan of merger or the plan of consolidation, together with a copy or a summary of the plan of merger or plan of consolidation, shall be given to each shareholder of record entitled to vote at the meeting within the time and in the manner provided by this chapter for the giving of notice of meetings of shareholders. If the meeting is an annual meeting, the purpose shall, nevertheless, be included in the notice of the annual meeting.