S.D. Codified Laws § 51A-3-27
No bank may make any purchase money loans or discounts on the security of the shares of its own capital stock, or on the shares of its parent holding company, nor be the purchaser or holder of any such shares unless such security or purchase is necessary to prevent loss upon a debt previously contracted in good faith. Stock so purchased or acquired shall, within six months of the time of its purchase, be sold or disposed of at public or private sale, and if not disposed of within that time, may no longer be included in the assets of such bank. However, a bank may purchase for fair value fractional shares of a bank's common stock from the holders thereof pursuant to the provisions set forth in Title 47 for the purpose of canceling the fractional shares if the bank meets all capital requirements after cancellation of the fractional shares.
SDCL 51A-3-27