Also acquires more Mondelez. : Bill Ackman, head of hedge fund Pershing Square, acquired a stake in Nike in the fourth quarter, a portfolio report on Feb. 14 showed. (Photo by Sylvain Gaboury/Patrick McMullan via Getty Images) Bill Ackman reported Wednesday that he made only one new buy, Nike Inc., and increased his holding of Mondelez International Inc. in the fourth quarter. The leader of the hedge fund Pershing Square acquired 5,836,020 Nike shares, which had a fourth-quarter average price of $57. The price has since gained 18% as of Wednesday evening.