Under Armour (NYSE: UAA) shares tumbled 8.6% in a single session after the athletic apparel company delivered a disappointing outlook that rattled investors. The company now expects revenue to decline at a mid-single digit percentage rate for 2027, a significant step down from its previous forecast of only a slight decline. Comparing Under Armour against key rivals, DiPalma noted the stock has fallen roughly 10.4% over the past month alone, underperforming much of the broader athletic apparel sector. Footwear revenue dropped 8%, accessories fell 4%, and apparel declined 2%, reflecting what DiPalma described as softness that was “really across the board” for the company. Investors will be watching closely to see whether Plank’s brand-tightening strategy can translate into improved margins and revenue stabilization, or whether further guidance cuts lie ahead.