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Kevin Plank has formed a large circle of celebrities since the founding of Under Armor Inc. more than two decades ago. While the company had grown from a small start-up to a global sportswear force, some even accompanied the CEO on the private jet that he rents to Under Armor.
Often in recent years, said a number of current and former leaders, he turned to a particular advisor: MSNBC's anchor, Stephanie Ruhle.
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