S.D. Codified Laws § 47-11G-5
All shareholders of a corporation formed pursuant to this chapter must be persons duly licensed by this state and actively engaged in the practice of physical therapy, occupational therapy, or speech-language pathology and must, at all times, own their shares in their own right.
A revocable trust may be a shareholder in a corporation organized under this chapter, for so long as the grantor of the revocable trust is living and is eligible to be a shareholder. After the death of the grantor, the shares owned by a revocable trust are subject to any divestiture and redemption provisions of this chapter, as if the shares were directly owned by the grantor of the trust.
Any shareholder who ceases to be an eligible shareholder must dispose of all shares either to the corporation or to a person who is qualified to be a shareholder.
SDCL 47-11G-5