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 insurer, or who is a director or an officer of such insurer, shall file with the superintendent within ten (10) days after he becomes such beneficial owner, director or officer a statement, in such form as the superintendent may prescribe, of the amount of all equity securities of such insurer of which he is the beneficial owner; and within ten (10) days after the close of each calendar month thereafter, if there has been a change in such ownership during such month, shall file with the superintendent a statement, in such form as the superintendent 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.