S.D. Codified Laws § 62-5-15
Upon the secretary sending a request to renew, request to post, or request to increase a security deposit to the maximum amount permitted by §§ 62-5-10 to 62-5-16, inclusive, a perfected security interest is created in the private self-insured's assets in favor of the secretary to the extent of any then unsecured portion of the self-insured's incurred liabilities for workers' compensation claims. That perfected security interest is transferred to any cash or securities thereafter posted by the private self-insured with the state treasurer or other financial institution and is released only upon:
The private self-insured employer loses all right and title in and any right to control all assets or obligations posted or placed on deposit as security. In the event of a declaration of bankruptcy or insolvency by a court of competent jurisdiction the secretary may liquidate the deposit for application to the self-insured employer's incurred liability.
SDCL 62-5-15