Shareholder activism is a form of activism in which shareholders use equity stakes in a corporation to put pressure on its management. A fairly small stake (less than 10% of outstanding shares) may be enough to launch a successful campaign. In comparison, a full takeover bid is a much more costly and difficult undertaking. The goals of shareholder activism range from financial (increase of shareholder value through changes in corporate policy, cost cutting, etc.) to non-financial (disinvestment from particular countries, etc.). Shareholder activists can address self-dealing by corporate insiders, although large stockholders can also engage in self-dealing to themselves at the expense of smaller minority shareholders.
Shareholder activism can take any of several forms: proxy battles, publicity campaigns, shareholder resolutions, litigation, and negotiations with management. Daniel Loeb, head of Third Point Management, is notable for his use of sharply written letters directed towards the CEOs of his target companies.