S.D. Codified Laws § 47-1A-708

At each meeting of shareholders, a chair shall preside. The chair shall be appointed as provided in the bylaws or, in the absence of such provision, by the board. The chair, unless the articles of incorporation or bylaws provide otherwise, shall determine the order of business and may establish rules for the conduct of the meeting. Any rules adopted for, and the conduct of, the meeting shall be fair to shareholders. The chair of the meeting shall announce at the meeting when the polls close for each matter voted upon. If no announcement is made, the polls are deemed to have closed upon the final adjournment of the meeting. After the polls close, no ballots, proxies, or votes nor any revocations or changes thereto may be accepted.