‘Antitakeover’ amendments are amendments to a corporation's charter that impede the ability of an ‘outsider’ to gain control of the firm. A number of individuals and institutions have onjected to such amendments on the grounds that they are not in the best interests of the shareholders of the firms that adopt them. This paper employs event-time methodology to investigate the impact of antitakeover amendments on the common stock prices of firms that adopt them. The results indicate that the announcement of such amendments is associated with a positive revaluation of stock price. Contrary to the concerns of their critics, we conclude that antitakeover amendments are proposed by managers who seek to increase the value of the firm and are approved by stockholders who share that objective.