Activist investors are individuals or groups that buy significant shares in a company to influence its management and operations. Their goal is often to increase the company's value, which can lead to higher stock prices. They may push for changes such as restructuring, cost-cutting, or even replacing executives to achieve their objectives. These investors typically engage in public campaigns to rally support from other shareholders. They may propose new strategies or advocate for changes in corporate governance. Notable activist investors include Carl Icahn and Bill Ackman, who have made headlines for their efforts to reshape companies like Herbalife and Target.