Sec Form 4 Filing - JEFFS ROGER @ UNITED THERAPEUTICS Corp - 2012-03-15

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person JEFFS ROGER 2. Issuer Name and Ticker or Trading Symbol UNITED THERAPEUTICS Corp [ UTHR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President & COO (Last) (First) (Middle) C/O UNITED THERAPEUTICS CORPORATION, 1040 SPRING STREET 3. Date of Earliest Transaction (MM/DD/YY) 03/15/2012 (Street) SILVER SPRING, MD20910 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock ( 1 ) ( 2 ) 03/15/2013 03/15/2013 M 10,000 A $ 25.315 ( 3 ) 29,760 ( 4 ) D Common Stock ( 1 ) ( 2 ) 03/15/2013 03/15/2013 S 10,000 D $ 61.06 19,760 ( 4 ) D Common Stock ( 5 ) 6,773 I By Jeffs Family LLC

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Share Tracking Award $ 47.5 03/15/2012 A 150,500 03/15/2013( 6 ) 03/15/2022 Common Stock 150,500 $ 0 150,500 D Share Tracking Award $ 61.06 03/15/2013 A 161,000 03/15/2014( 7 ) 03/15/2023 Common Stock 161,000 $ 0 161,000 D Share Tracking Award $ 25.315 03/15/2013 03/15/2013 M 10,000 06/03/2009 06/03/2018 Common Stock 10,000 $ 0 3,250 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other JEFFS ROGER C/O UNITED THERAPEUTICS CORPORATION 1040 SPRING STREET SILVER SPRING, MD20910 X President & COO Signatures /s/ John S. Hess, Jr. under Power of Attorney 03/18/2013 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Exercise of a cash-settled share tracking award. ( 2 )This exercise of share tracking awards was pursuant to a Rule 10b5-1 trading plan entered into by the reporting person. ( 3 )Exercise price and number of shares/awards has been adjusted to reflect the issuer's two-for-one stock split on September 22, 2009. ( 4 )Includes 897 shares acquired under the United Therapeutics Corporation Employee Stock Purchase Plan on March 4, 2013. ( 5 )Shares held by a family limited liability company of which the reporting person and his spouse are managing members. ( 6 )These share tracking awards vest in one-fourth increments on each of March 15, 2013, 2014, 2015 and 2016, and settle in cash only. ( 7 )These share tracking awards vest in one-fourth increments on each of March 15, 2014, 2015, 2016 and 2017, and settle in cash only.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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