The hedge fund billionaire Bill Ackman has bet big on the iconic American brand. His firm, Pershing Square, acquired three million shares, or 0.2 percent, of Nike this spring. His stake is currently worth about $250 million.

Stocks were choppy Friday as market participants took a breather following Thursday's Fed-fueled rally. While buzz continued to swirl around the Federal Reserve's jumbo-sized rate cut from earlier this week, today's headlines centered mostly on single-stock news, including Nike's ( NKE) big C-suite shake-up.