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Allergan plc is an Irish-domiciled pharmaceutical company that acquires, develops, and markets brand name drugs, and in 2017 generated 80% net sales from the U.S. healthcare system. Allergan plc was formed in February 2015 when Irish–registered Actavis plc acquired U.S.–registered Allergan, Inc., and assumed the Allergan name. Actavis was a 2013 U.S. tax inversion that moved its legal domicile to Ireland to avoid U.S. taxes. Actavis used the Irish low-tax corporate system to acquire large U.S. pharmaceutical firms (e.g. Forest Labs, Allergan Inc.), and redomicile them to Ireland.