X0202 4 2006-12-14 0 0001082554 UNITED THERAPEUTICS CORP UTHR 0001106578 ROTHBLATT MARTINE A 1 1 0 0 CEO Common Stock 2006-12-14 2006-12-14 4 M 0 5000 16.7 A 215902 D Common Stock 2006-12-14 2006-12-14 4 M 0 2000 16.5 A 217902 D Common Stock 2006-12-14 2006-12-14 4 S 0 5000 55.7514 D 212902 D Common Stock 2006-12-14 2006-12-14 4 S 0 2000 55.2048 D 210902 D Employee Stock Options 16.7 2006-12-14 2006-12-14 4 M 0 5000 0 D 2002-12-31 2012-12-31 Common Stock 5000 1382916 D Employee Stock Options 16.5 2006-12-14 2006-12-14 4 M 0 2000 0 D 1997-12-07 2007-12-07 Common Stock 2000 1380916 D This exercise and sale of 5,000 shares is pursuant to the 10b5-1 Plan adopted by the reporting person on August 19, 2002. Includes 20,173 shares held by the reporting person's spouse. This exercise and sale of 2,000 shares is pursuant to the 10b5-1 Plan adopted by the reporting person on August 21, 2006. Includes 1,468 shares issuable upon the exercise of stock options held by the reporting person's spouse. /s/ Paul A. Mahon under Power of Attorney 2006-12-15