Under Armour is a public company and has five principal shareholders. Kevin Plank is the largest Under Armour shareholder, with 33.8 million Class C shares owned indirectly through a series of trusts. Plank's stake in Under Armour affords him 65% of the company's voting power. Other shareholders are Patrik Frisk, Michael S. Lee, Harvey L. Sanders, and Kip Fulks.