S.D. Codified Laws § 51A-6A-24
Any trust company in corporate form may issue preferred stock of one or more classes in amounts approved by the director. The holders of two-thirds of the common stock of the trust company shall approve the issuance at a meeting held for that purpose. Notice shall be given by registered mail to each stockholder at least five days before the date of the meeting under this section. An issuance of preferred stock is not valid until the par value of all stock so issued is paid in. Preferred stock may be retired only if the trust company is in compliance with the capital requirements under § 51A-6A-19 following retirement of the preferred stock and if two-thirds of the holders of common stock of the trust company and the director approve the retirement.
SDCL 51A-6A-24