X0202 4/A 2005-01-20 2005-01-21 0 0001082554 UNITED THERAPEUTICS CORP UTHR 0001106578 ROTHBLATT MARTINE A 1 1 0 0 CEO Employee Stock Option 43.6 2005-01-20 2005-01-20 4 A 0 1500 0 A 2005-01-20 2010-06-23 Common Stock 1500 322251 D Employee Stock Option 43.6 2005-01-20 2005-01-20 4 A 0 500000 0 A 2005-01-20 2010-06-26 Common Stock 500000 822251 D Employee Stock Option 43.6 2005-01-20 2005-01-20 4 A 0 298592 0 A 2005-01-20 2015-01-20 Common Stock 298592 1120843 D The Expiration Date for this stock option was incorrectly described in the reporting person's original Form 4. Instead of a new ten-year option grant as incorrectly reported on the reporting person's original Form 4, the term of this option is for the remaining term of the original June 23, 2000 grant for this option which was subsequently canceled by the issuer on July 19, 2004. The footnote to the Number of Derivative Securities Beneficially Owned Following Reported Transactions was incorrectly described in the reporting person's original Form 4. The correct footnote is as follows: "Includes 1,468 shares issuable upon exercise of stock options held by the reporting person's spouse." The Expiration Date for this stock option was incorrectly described in the reporting person's original Form 4. Instead of a new ten-year option grant as incorrectly reported on the reporting person's original Form 4, the term of this option is for the remaining term of the original June 26, 2000 grant for this option which was subsequently canceled by the issuer on July 19, 2004. The footnote to the Number of Derivative Securities Beneficially Owned Following Reported Transactions was incorrectly described in the reporting person's original Form 4. The correct footnote is as follows: "Includes 1,468 shares issuable upon exercise of stock options held by the reporting person's spouse." The footnote to the Number of Derivative Securities Beneficially Owned Following Reported Transactions was incorrectly described in the reporting person's original Form 4. The correct footnote is as follows: "Includes 1,468 shares issuable upon exercise of stock options held by the reporting person's spouse." /s/ Paul A. Mahon under Power of Attorney 2005-01-31