Under Armour is the cautionary tale the rest of the industry tells about itself, the brand that climbed faster than anyone and then fell just as hard. It is also a real company that a twenty four year old built out of his grandmother’s basement on a single idea, and it is worth taking seriously precisely because of how close it came to everything and how much of it has slipped away.

Cotton is the enemy

In 1996 Kevin Plank, a special teams captain on the University of Maryland football team, was tired of the soaked cotton T-shirt under his pads while his synthetic compression shorts stayed dry through the whole practice. That was the entire idea. He started Under Armour in his grandmother’s basement in Washington, selling moisture-wicking compression shirts out of the trunk of his car to equipment managers up and down the East Coast. No air cushioning, no signature athlete, no decades of heritage. One shirt that did one thing better than cotton.

It worked far past anyone’s expectations. Under Armour owned the base layer, went public in 2005, and for a stretch in the mid-2010s was the fastest growing name in American sportswear, riding more than two dozen straight quarters of twenty percent growth and briefly passing adidas to become the number two brand in the United States.

The Curry years

The move that nearly made it a giant was a person. In 2013 Under Armour signed a skinny, overlooked guard the basketball establishment had not yet figured out, signing Stephen Curry away from Nike in a deal Nike reportedly did not fight hard to keep. Two MVPs and a revolution in how the game is played later, the Curry line gave Under Armour something it had never had, a basketball business and a genuine sneaker icon. For a moment in 2016 analysts wondered aloud whether Curry might outsell LeBron.

The fall

Then the growth stopped, all at once. The streak ended in 2016, the brand posted its first loss as a public company, and the story turned. In 2021 Under Armour paid a nine million dollar penalty to settle SEC charges that it had pulled future sales forward into earlier quarters to keep the twenty percent growth story alive. The CEO chair became a revolving door, Plank stepping back in 2020, two CEOs cycling through, until Plank returned as CEO in April 2024 to try to fix what he had built.

Losing the one that mattered

Then, in late 2025, the hardest blow. After twelve years, Under Armour and Stephen Curry ended their partnership, and Curry walked away owning his Curry Brand outright, logo and all. Months later he signed a reported four hundred million dollar deal with the Chinese brand Li-Ning. Under Armour released the Curry 13 as the final signature shoe of the line, and was left, once again, as a brand that does apparel brilliantly and is still searching for its footing in shoes.

The honest read on Under Armour is that it was never really a sneaker company that happened to make shirts. It was a shirt company, the best one anyone has built in the modern era, that spent a decade trying to become Nike and found out how hard that actually is. Its founder is back, the swagger is gone, and the most interesting question in the building is whether a brand built on one perfect product can find a second act without the one player who nearly gave it one.