The animal health company combines with its former owner in a reverse merger.
Illumina, Centene, Community Health, Incyte and Vertex were among the healthcare stocks that did well in the first quarter.
The Pershing Square manager also holds a stake in Chipotle and used to be invested in JCPenney and Canadian Pacific Railway. Here are some of his most contentious investments.
The Pershing Square manager apologized to clients in his annual letter.
The company's shares were falling again on Wednesday, this time on the news that its initial application for an anti-asthma generic had been rejected by the FDA.
The deal helps the company manage its $31 billion debt load, sending the shares up nearly 4% midday Wednesday.
The company could be gearing up for multiple challenges on the D.C. front, analysts say.
Mike Pearson is alleging that Valeant has refused to pay him for the three million shares he is owed.
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