A record-setting week for Wall Street is closing on a quieter note Friday, and U.S. stocks are pulling back from their highs hit during a worldwide rally the day before. The S&P 500 was down 0.5% in late trading,

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.

"This would be the third time that stocks entered a cycle where annual returns compound at high teens," Fundstrat's Tom Lee said.