S.D. Codified Laws § 37-1-3.1 (2026)
A contract, combination, or conspiracy between two or more persons in restraint of trade or commerce any part of which is within this state is unlawful. A person is any natural person, partnership, limited liability company, corporation, association, or other legal entity.
Source: SL 1977, ch 305 , § 1; SL 1994, ch 351 , § 82.