EX-21.1 6 exhibit21_1.htm EXHIBIT 21.1

Exhibit 21.1
LIST OF SUBSIDIARIES FOR THE REGISTRANT
Subsidiaries of Ionis Pharmaceuticals, Inc:
Ionis USA Limited, a United Kingdom Limited Private Company
Osprey Therapeutics, Inc., a Delaware Corporation
PerIsis I Development Corporation, a Delaware Corporation
Symphony GenIsis, Inc., a Delaware Corporation
Ionis Development (Ireland) Limited, an Ireland Limited Private Company
Akcea Therapeutics, Inc., a Delaware Corporation
Subsidiaries of Akcea Therapeutics, Inc.:
Akcea Therapeutics Canada Inc., a Canadian Corporation
Akcea Therapeutics France SAS, a French Company
Akcea Therapeutics Germany GmbH, a German Corporation
Akcea Therapeutics UK Limited, a United Kingdom Limited Private Company
Akcea Securities Corporation., a Massachusetts Corporation
Akcea Therapeutics Ireland Limited, an Ireland Limited Private Company