X0306 4 2015-01-29 0001082554 UNITED THERAPEUTICS Corp UTHR 0001106578 ROTHBLATT MARTINE A C/O UNITED THERAPEUTICS CORPORATION 1040 SPRING STREET SILVER SPRING MD 20910 1 1 Chairman & Co-CEO Common Stock 2015-01-29 4 M 0 4115 34.56 A 4255 D Common Stock 2015-01-29 4 S 0 2087 142.6323 D 2168 D Common Stock 2015-01-29 4 S 0 1013 143.8102 D 1155 D Common Stock 2015-01-29 4 S 0 1015 144.7069 D 140 D Common Stock 2015-01-29 4 M 0 5547 30.75 A 5687 D Common Stock 2015-01-29 4 S 0 3947 142.7983 D 1740 D Common Stock 2015-01-29 4 S 0 1300 144.0246 D 440 D Common Stock 2015-01-29 4 S 0 300 144.7133 D 140 D Common Stock 166 I By Spouse Common Stock 533094.05 I By Trusts Stock Options 34.56 2015-01-29 4 M 0 4115 0 D 2005-12-30 2015-12-30 Common Stock 4115 172845 D Stock Options 30.75 2015-01-29 4 M 0 5547 0 D 2009-12-26 2017-12-31 Common Stock 5547 554665 D This exercise of stock options and corresponding sale of shares was pursuant to a Rule 10b5-1 trading plan entered into by the reporting person. Exercise price and number of shares/awards has been adjusted to reflect the issuer's two-for-one stock split on September 22, 2009. This transaction was executed in multiple trades at prices ranging from $142.2101 to $143.13. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $143.4301 to $144.32. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $144.325 to $144.1001. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $142.40 to $143.24. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $143.44 to $144.41. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple trades at prices ranging from $144.46 to $145.05. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. /s/ John S. Hess, Jr. under Power of Attorney 2015-01-30