United Therapeutics Telephone: 301-608-9292 Email: ir@unither.com
Mailing address: Computershare P.O. Box 30170 College Station, TX 77842-3170
Overnight correspondence: Computershare 211 Quality Circle, Suite 210 College Station, TX 77845
Website: www.computershare.com/investor Tel: 1 (201) 680-6578 Toll Free: (800) 524-4458