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 OF SECURITIES 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 * ROTHBLATT MARTINE A   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) Chairman & Co-CEO (Last) (First) (Middle) C/O UNITED THERAPEUTICS CORPORATION, 1040 SPRING STREET 3. Date of Earliest Transaction (Month/Day/Year) 12/31/2014 (Street) SILVER SPRING, MD 20910 4. If Amendment, Date Original Filed(Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 12/31/2014   M(1)   2,211 A $ 63.22 2,351 D   Common Stock 12/31/2014   S(1)   811 D $ 129.9303 (2) 1,540 D   Common Stock 12/31/2014   S(1)   600 D $ 131.7383 (3) 940 D   Common Stock 12/31/2014   S(1)   400 D $ 132.1025 (4) 540 D   Common Stock 12/31/2014   S(1)   400 D $ 132.9175 (5) 140 D   Common Stock               166 I By Spouse Common Stock               533,094.05 I By Trusts

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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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

Stock Options

$ 129.49

12/31/2014

A(6)

724,272

12/31/2014

12/31/2024

Common Stock

724,272

$ 0

724,272

D

Stock Options

$ 63.22

12/31/2014

M(1)

2,211

12/31/2010

12/31/2020

Common Stock

2,211

$ 0

459,907

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
ROTHBLATT MARTINE A C/O UNITED THERAPEUTICS CORPORATION 1040 SPRING STREET SILVER SPRING, MD 20910	X		Chairman & Co-CEO

Signatures

/s/ John S. Hess, Jr. under Power of Attorney		01/02/2015
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	This exercise of stock options and corresponding sale of shares was pursuant to a Rule 10b5-1 trading plan entered into by the reporting person.
(2)	This transaction was executed in multiple trades at prices ranging from $129.41 to $130.29. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(3)	This transaction was executed in multiple trades at prices ranging from $130.62 to $131.59. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(4)	This transaction was executed in multiple trades at prices ranging from $131.65 to $132.62. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(5)	This transaction was executed in multiple trades at prices ranging from $132.69 to $133.16. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(6)	Award of stock options in accordance with the terms of the reporting person's employment agreement, which entitles the reporting person to an annual award of stock options to purchase the number of shares of common stock that is equal to one-eighteenth of one percent of the increase (if any) in the issuer's market capitalization from December of the previous year to December of the current year, based on the average closing price of the issuer's common stock during the relevant month. Effective January 1, 2015, the reporting person's employment agreement has been amended to eliminate this contractual entitlement beginning with the 2015 performance period, as discussed in the issuer's Current Report on Form 8-K filed with the SEC on December 17, 2014.

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