S.D. Codified Laws § 58-14-12
In the case of a group of incorporated underwriters, the trust in § 58-14-11 shall be in an amount not less than the group's several liabilities attributable to business ceded by United States ceding insurers to any member of the group pursuant to reinsurance contracts issued in the name of the group. In addition, the group shall maintain a joint trusteed surplus of which one hundred million dollars shall be held jointly for the benefit of United States ceding insurers of any member of the group as additional security for any liabilities, and each member of the group shall make available to the director an annual certification of the member's solvency by the member's domiciliary regulator and financial statements of each underwriter member of the group prepared by its independent public accountant within ninety days after its financial statements are due to be filed with the group's domiciliary regulator. The group shall maintain a trust fund in an amount not less than the group's several liabilities attributable to business ceded by United States domiciled ceding insurers to any member of the group pursuant to reinsurance contracts issued in the name of the group.
A group of incorporated underwriters under this section are those under common administration which comply with the filing requirements contained in § 58-14-11, that has continuously transacted an insurance business outside the United States for at least three years immediately prior to making application for accreditation, that submits to this state's authority to examine its books and records and bears the expense of the examination, and that has aggregate policyholders' surplus of at least ten billion dollars.
SDCL 58-14-12