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 & CEO (Last) (First) (Middle) C/O UNITED THERAPEUTICS CORPORATION, 1040 SPRING STREET 3. Date of Earliest Transaction (Month/Day/Year) 03/23/2017 (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 03/23/2017   M(1)   1,219 A $ 30.75 (2) 1,359 D   Common Stock 03/23/2017   S(1)   719 D $ 138.9599 (3) 640 D   Common Stock 03/23/2017   S(1)   500 D $ 139.8601 (4) 140 D   Common Stock 03/23/2017   M(1)   957 A $ 30.75 (2) 650,162 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

$ 30.75 (2)

03/23/2017

M(1)

1,219

12/26/2009

12/31/2017

Common Stock

1,219

$ 0

79,312

D

Stock Options

$ 30.75 (2)

03/23/2017

M(1)

957

12/26/2009

12/31/2017

Common Stock

957

$ 0

78,355

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 & CEO

Signatures

/s/ John S. Hess, Jr. under Power of Attorney		03/23/2017
**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. The transaction was structured as a broker-assisted cashless exercise, such that the number of shares sold was limited to a sufficient number to cover the exercise price of the options and anticipated taxes. The remaining shares are held by a trust beneficially owned by the reporting person.
(2)	Exercise price and number of shares/awards has been adjusted to reflect the issuer's two-for-one stock split on September 22, 2009.
(3)	This transaction was executed in multiple trades at prices ranging from $138.55 to $139.25. 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 $139.61 to $140.45. 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.

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