X0303 4 2008-12-08 0 0001082554 UNITED THERAPEUTICS CORP UTHR 0001106578 ROTHBLATT MARTINE A 1 1 0 0 CEO Common Stock 2008-12-08 2008-12-08 4 J 0 30000 0 A 30000 D Common Stock 2008-12-08 2008-12-08 4 J 0 30000 0 A 60000 D Common Stock 2008-12-10 2008-12-10 4 J 0 30000 0 D 60000 D Common Stock 2008-12-08 2008-12-08 4 J 0 14382 0 A 74382 D Common Stock 2008-12-08 2008-12-08 4 J 0 24257 0 A 98639 D Common Stock 2008-12-10 2008-12-10 4 G 0 14382 0 D 84257 D Common Stock 2008-12-10 2008-12-10 4 G 0 24257 0 D 60000 D Common Stock 94353 I By Trusts Common Stock 65519 I By Trusts Shares held by the reporting person in four GRATs and one PMT. Shares held by the reporting person's spouse in four GRATs and one PMT. Shares transferred temporarily to a revocable trust controlled by the reporting person. Shares transferred temporarily to a revocable trust controlled by the reporting person's spouse. Shares transferred temporarily from a revocable trust held by the reporting person's spouse to a revocable trust held by the reporting person. These shares will be transferred to a new GRAT later this week. Shares transferred temporarily to the reporting person's brokerage account. Shares transferred temporarily to the reporting person's spouse's brokerage account. Shares transferred from the reporting person's brokerage account to a new GRAT held by the reporting person. Shares transferred from the reporting person's spouse's brokerage account to a new GRAT held by the reporting person's spouse. These shares will be transferred to a new GRAT later this week. /s/ Paul Mahon under Power of Attorney 2008-12-10