S.D. Codified Laws § 58-5-69
Every person who is directly or indirectly the beneficial owner of more than ten percent of any class of any equity security of a domestic stock insurance company, or who is a director or an officer of such company, shall file in the office of the director of the Division of Insurance within ten days after he becomes such beneficial owner, director, or officer, a statement, in such form as the director may prescribe, of the amount of all equity securities of such company of which he is the beneficial owner. If there has been a change in ownership during any month, such person shall file within ten days after the end of such month in the office of the director a statement, in such form as the director may prescribe, indicating his ownership at the close of the calendar month and such changes in his ownership as have occurred during such calendar month.
SDCL 58-5-69