Following the earlier of the date of the contract to purchase the shares or the date of the commissioner’s approval of the purchase, offer to purchase, tender offer, request to purchase, or invitation to purchase the shares, the company the shares of which are being purchased may not purchase or contract to purchase any of its own shares as treasury shares, issue or contract to issue any of its authorized but unissued shares, or make any investments in or loans to the purchasing company or an affiliate of the purchasing company unless the investment or loan is otherwise authorized and approved in advance by the commissioner under Chapter 823.