Allergan Acquisition and Actavis Name Change [edit]. In November 2014 Actavis announced its intention to acquire Allergan, the manufacturer of Botox Completion of the deal would increase its market capitalization to $147 billion.On March 17, 2015, Actavis completed the acquisition of Allergan in a cash and equity transaction valued at approximately $70.5 billion.n June 2015 Allergan announced it would acquire Kythera Biopharmaceuticals for around $2.1 billion. On June 1, the company completed its acquisition of Auden Mckenzie Holdings Limited for £306 million. On July 6, the company acquired start-up, Oculeve, for $125 million.