S.D. Codified Laws § 58-18B-7
Each small employer carrier shall maintain at the carrier's principal place of business a complete and detailed description of the carrier's rating practices and renewal underwriting practices, including information and documentation which demonstrate that the carrier's rating methods and practices are based upon commonly accepted actuarial assumptions and are in accordance with sound actuarial principles.
A small employer carrier shall make the information and documentation required by this section available to the director upon request. Except in cases of violations of this chapter, the information shall be considered proprietary and trade secret information and is not subject to disclosure by the director to persons outside of the division except as agreed to by the carrier or by order of a court, or if requested by a law enforcement officer or another state insurance agency.
SDCL 58-18B-7