Investor Contacts:
Tina Ventura
Senior Vice President,
Chief Investor Relations Officer
investor-relations@horizontherapeutics.com

Ruth Venning
Executive Director,
Investor Relations and ESG
investor-relations@horizontherapeutics.com

Erin Linnihan
Executive Director,
Investor Relations 
investor-relations@horizontherapeutics.com

Ireland Media Contact:
Ray Gordon
Gordon MRM
ray@gordonmrm.ie
+353 (87) 2417373

U.S. Media Contact:
Geoff Curtis
Executive Vice President,
Corporate Affairs & Chief
Communications Officer
media@horizontherapeutics.com
+1 888 506-2562

Transfer Agent and Registrar:
Computershare Investor Services
www.computershare.com

Ireland:
+353 1 447 5566
3100 Lake Drive
Citywest Business Campus
Dublin 24, D24 AK82 Ireland

United States:
+1 866 286-9155 (in the U.S.)
+1 732 491-0661 (outside the U.S.)
462 South 4th Street, Suite 1600
Louisville, KY 40202