Type	Name	Date
Merger agreement	AGREEMENT AND PLAN OF MERGER by and among PORTOLA PHARMACEUTICALS, INC., ALEXION PHARMACEUTICALS, INC. and Odyssey Merger Sub Inc.	05/07/2020
Merger agreement	Agreement and Plan of Merger, by and among Alexion, Beagle Merger Sub, Inc. and Achillion	10/16/2019
Merger agreement	Agreement and Plan of Merger, by and among Alexion, Beagle Merger Sub, Inc. and Achillion	10/16/2019