Tom Brady has signed an endorsement deal with Under Armour. Brady previously endorsed Nike, but his contract expired last summer. "Under Armour's everything I was looking for,'' Brady said. "It's cool. It's fun. It's what so many of the kids are wearing, and I like to try to stay cutting-edge. I like the company. I think we've got a lot in common. We both want to stay hungry, stay humble.'' Brady is not only joining Under Armour as a contracted endorser, but also is getting a financial stake in the company. "Tom is a shareholder in Under Armour,'' said 38-year-old company founder and CEO Kevin Plank. "Equity was a part of our deal. That was important to Tom, that [a stake in the company] was a part of the deal.''