Bill Ackman is one of the most widely followed investment managers in the world. He's in charge of Pershing Square Capital, a hedge fund focused on investing in just a handful of Ackman's best ideas. His highly concentrated portfolio is full of great companies, but he might have just made one stock the biggest holding at Pershing Square.

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Billionaire investor Bill Ackman's Pershing Square Capital acquired a $2.3 billion stake in Uber by purchasing 30.3 million shares. Ackman has praised Uber's CEO for transforming the company and also claimed that the company has more scope for growth.

William Albert Ackman, more commonly known as Bill Ackman, is the founder and CEO of Pershing Square Capital Management, a hedge fund management company.

Uber stock hit its highest level since October after Ackman disclosed his Pershing Square hedge fund accumulated a 1.4% stake in the ride hailer.

Maybe Bill Ackman has. He said he has been "a long-term customer and admirer of Uber beginning when Edward Norton showed me the app in its early days," "I was also fortunate to be a day-one investor in the company through a small investment in a venture fund,

Last week, the stock of Uber Technologies went on a wild ride, falling hard after Uber reported earnings on Feb. 5, only to rocket higher toward the end of the week. On earnings, while revenue and earnings per share actually beat expectations,