As the benefits of gender equality for governance become more apparent, boardroom diversity initiatives abound. At the same time, institutional investors play an increasingly central role in the corporate world. This Article takes a novel approach to achieve this necessary change. Institutional investors already oversee firm leadership quite closely. This Article suggests that institutional investors hold a fiduciary duty to ensure there is gender diversity in leadership. As objections to state mandates persist, institutional investors can bring the benefits of private ordering to play a central role in ensuring equality.