Pfizer

Allergan, Pfizer call off proposed $160B merger
The biggest U.S.-based drugmaker, Pfizer Inc., will stay put thanks to aggressive new Treasury Department rules that succeeded in blocking Pfizer from acquiring rival Allergan and moving to Ireland -- at least on paper -- to reduce its tax bill.
Pfizer, Allergan $160B deal forms world’s largest drugmaker
Pfizer, which makes the cholesterol fighter Lipitor, will keep its global operational headquarters in New York. But the drugmaker will combine with Botox-maker Allergan as a company that will be called Pfizer Plc. That company would have its legal domicile and principal executive offices in Ireland.