X0306 4 2017-06-21 0001082554 UNITED THERAPEUTICS Corp UTHR 0001193522 SULLIVAN LOUIS W C/O UNITED THERAPEUTICS CORPORATION 1040 SPRING STREET SILVER SPRING MD 20910 1 Common Stock 2017-06-21 4 M 0 1750 0 A 1750 D Restricted Stock Units 0 2017-06-21 4 M 0 1750 0 D Common Stock 1750 0 D Shares received upon vesting of restricted stock units on June 21, 2017. Restricted stock units converted on a one-for-one basis into shares of common stock. Restricted stock units convert on a one-for-one basis into shares of common stock. The restricted stock units were granted on June 21, 2016, and vested on June 21, 2017. The entire number of restricted stock units converted into shares of common stock upon vesting. /s/ John S. Hess, Jr. under Power of Attorney 2017-06-22