Mallinckrodt to Buy Questcor in $5.6 Billion Drug Deal

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Mallinckrodt Plc agreed to buy Questcor Pharmaceuticals Inc. for $5.6 billion to add specialty drugs in the latest industry deal that moves a U.S. company to Ireland for a lower tax rate.

Mallinckrodt, with its registered headquarters in Dublin and run from Hazelwood, Missouri, will pay cash and stock valued at $86.08 a share for Questcor, the companies said in a statement today. That’s 27 percent above the April 4 closing price for Anaheim, California-based Questcor.