Ackman made a couple of big moves in Pershing Square's portfolio.

Bill Ackman is one of the most closely followed investment managers on Wall Street. His Pershing Square Capital Management hedge fund holds just a handful of high-conviction positions, and he typically holds those positions for the long run.

Ackman is often forthcoming with the biggest moves in his portfolio. He'll usually disclose new trades through his social media accounts or monthly updates to his hedge fund investors. But Pershing Square's quarterly 13F filing with the Securities and Exchange Commission (SEC) can provide a full accounting of the hedge fund's portfolio of publicly traded U.S. stocks.

Ackman made a couple of big moves last quarter, and now holds roughly 58% of the portfolio in just three companies

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