Indra Nooyi. Ellen Kullman. Meg Whitman. Irene Rosenfeld. What do they all have in common?

Each woman runs, or has run, a Fortune 500 company—PepsiCo, Dupont, Hewlett-Packard, and Mondelez, respectively—and each one has been a target of shareholder activism.

More information: http://fortune.com/2016/08/16/female-ceo-shareholder-activist/