X0202 4/A 2005-12-29 2005-12-30 0 0001082554 UNITED THERAPEUTICS CORP UTHR 0001237334 CAUSEY CHRISTOPHER 1 0 0 0 Common Stock 2005-12-29 2005-12-29 4 G 0 100 0 D 1800 D Charitable gift. Includes 1,200 shares held by the reporting person's spouse as UGTMA trustee on behalf of the reporting person's children. This Form 4 Amendment was filed to correct the original 12/30/05 Form 4 because the amount of the shares actually gifted was 100 shares, not the 300 shares reported on 12/30/05, because of a broker error. /s/ Paul A. Mahon under Power of Attorney 2006-03-03