S.D. Codified Laws § 47-1A-731
Voting agreements
Two or more shareholders may provide for the manner in which they will vote their shares by signing an agreement for this purpose. A voting agreement created under this section is not subject to the provisions of §§ 47-1A-730 and 47-1A-730.1 . A voting agreement created under this section is specifically enforceable.
Source: SL 2005, ch 239, § 115.