If any person increases its ownership of shares in a given company through a restricted purchase of shares or restricted offer for shares so that such person or those with whom such person is acting in concert become the owner of (50%) fifty percent or more of a given class of voting shares listed on the Exchange, the Board shall have the right, within sixty (60) days, if it believes it would achieve the safety of the market and the protection of shareholders, to order such person to offer to purchase the shares of the same class it does not own on such terms and conditions as the Board shall determine. In no case will the prospective purchaser be compelled to offer to purchase the remaining shares at a price exceeding the highest price he paid to purchase any of the shares of that company during the 12 months preceding the date of the Board order.