S.D. Codified Laws § 47-1A-1434.1
An election to purchase pursuant to §§ 47-1A-1434 to 47-1A-1434.7, inclusive, may be filed with the court at any time within ninety days after the filing of the petition under subdivision 47-1A-1430(2) or at such later time as the court in its discretion may allow. If the election to purchase is filed by one or more shareholders, the corporation shall, within ten days thereafter, give written notice to all shareholders, other than the petitioner. The notice must state the name and number of shares owned by the petitioner and the name and number of shares owned by each electing shareholder and must advise the recipients of their right to join in the election to purchase shares in accordance with this section. Shareholders who wish to participate must file notice of their intention to join in the purchase no later than thirty days after the effective date of the notice to them. All shareholders who have filed an election or notice of their intention to participate in the election to purchase thereby become parties to the proceeding and shall participate in the purchase in proportion to their ownership of shares as of the date the first election was filed, unless they otherwise agree or the court otherwise directs. After an election has been filed by the corporation or one or more shareholders, the proceeding under subdivision 47-1A-1430(2) may not be discontinued or settled, nor may the petitioning shareholder sell or otherwise dispose of the petitioner's shares, unless the court determines that it would be equitable to the corporation and the shareholders, other than the petitioner, to permit such discontinuance, settlement, sale, or other disposition.
SDCL 47-1A-1434.1