X0306 4 2017-07-06 0001082554 UNITED THERAPEUTICS Corp UTHR 0001231589 MAHON PAUL A C/O UNITED THERAPEUTICS CORPORATION 1040 SPRING STREET SILVER SPRING MD 20910 1 EVP & General Counsel Common Stock 2017-07-06 4 M 0 3500 57.15 A 38926 D Common Stock 2017-07-06 4 M 0 2500 51.37 A 41426 D Common Stock 2017-07-06 4 D 0 6000 131.71 D 35426 D Share Tracking Award 57.15 2017-07-06 4 M 0 3500 0 D 2011-03-15 2020-03-15 Common Stock 3500 55000 D Share Tracking Award 51.37 2017-07-06 4 M 0 2500 0 D 2011-09-15 2020-09-15 Common Stock 2500 0 D This exercise of share tracking awards was pursuant to a Rule 10b5-1 trading plan entered into by the reporting person. /s/ John S. Hess, Jr. under Power of Attorney 2017-07-07