S.D. Codified Laws § 58-14-11
Credit shall also be allowed if the reinsurance is ceded to an assuming insurer that maintains a trust fund in a qualified United States financial institution for the payment of the valid claims of the assuming insurer's United States ceding insurers, their assigns and successors in interest. The assuming insurer shall report annually to the director information substantially the same as that required to be reported on the National Association of Insurance Commissioners annual statement form by licensed insurers to enable the director to determine the sufficiency of the trust fund. The assuming insurer shall submit to examination of the assuming insurer's books and records by the director and bear the expense of examination.
Credit for reinsurance may not be granted pursuant to this section unless the form of the trust and any amendments to the trust have been approved by the commissioner of the state where the trust is domiciled, or the commissioner of another state has accepted principal regulatory oversight of the trust pursuant to the terms of the trust instrument.
SDCL 58-14-11