Bill Ackman is a prominent advocate of shareholder activism, leveraging his hedge fund, Pershing Square, to push for corporate changes that he believes will unlock shareholder value.

He typically invests in underperforming companies, then uses his influence to advocate for management reforms, operational improvements, or even strategic changes like mergers or spinoffs.

Ackman’s activism often involves public campaigns to increase pressure on company boards and leadership.

This approach aims to enhance performance and boost stock prices, as seen in his high-profile interventions with companies like Target and Chipotle.