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United Therapeutics Telephone: 301-608-9292
Mailing address: Computershare P.O. Box 43006 Providence, RI 02940-3006
Courier delivery: Computershare 150 Royall St., Suite 101 Canton, MA 02021
Website: www.computershare.com/investor Tel: 1 (201) 680-6578 Toll Free: (800) 524-4458