S.D. Codified Laws § 58-14-12.1
In the case of a group including incorporated and individual unincorporated underwriters, the trust in § 58-14-11 shall consist of a trusteed account in an amount not less than the respective underwriters' several liabilities attributable to business ceded by United States domiciled ceding insurers to any underwriter in the group. Notwithstanding the other provisions of this chapter, the trust in § 58-14-11 for reinsurance ceded under reinsurance agreements with an inception date on or before June 30, 1993, and not amended or renewed after that date, shall consist of a trusteed account in an amount not less than the respective underwriters' several insurance and reinsurance liabilities attributable to business written in the United States. In addition to these trusts, the group shall maintain in trust a trusteed surplus of which one hundred million dollars shall be held jointly for the benefit of United States domiciled ceding insurers of any member of the group for all years of account.
The incorporated members of the group with a trust under § 58-14-11 may not be engaged in any business other than underwriting as a member of the group and shall be subject to the same level of regulation and solvency control by the group's domiciliary regulator as are the unincorporated members.
Within ninety days after its financial statements are due to be filed with the group's domiciliary regulator, the group shall provide to the director an annual certification by the group's domiciliary regulator of the solvency of each underwriter member or, if a certification is unavailable, financial statements, prepared by independent public accountants, of each underwriter member of the group.
SDCL 58-14-12.1