Markets

Carl Icahn reportedly building small position in Allergan, joining David Tepper

Key Points
  • Carl Icahn is building a small stake in pharmaceutical company Allergan, Bloomberg reported, citing sources.
  • Shares of Allergan rose 2.6 percent in premarket trading Thursday.
Carl Icahn at Delivering Alpha 2015 in New York.
Adam Jeffery | CNBC

Carl Icahn is building a small stake in pharmaceutical company Allergan, Bloomberg reported Wednesday, citing sources.

The billionaire's investment would come in addition to the 1 percent stake held by David Tepper's Appaloosa Management. On Tuesday, Tepper said in a letter he is pushing the drugmaker to overhaul its management.

Shares of Allergan rose 2.6 percent in premarket trading Thursday.

"Allergan welcomes all investments in our company," the firm said in a statement. "We maintain an active dialogue with our shareholders and value their constructive input and ideas on delivering long-term value."

Icahn bought a big stake in Allergan in 2016 but sold out about a year later.

Read the full Bloomberg story here.

WATCH: Allergan responds to Appaloosa's call for change

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Allergan responds to Appaloosa's calls for management changes