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 * Thompson Tommy G   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 _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 1040 SPRING ST. 3. Date of Earliest Transaction (Month/Day/Year) 06/26/2018 (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 06/28/2018   M   1,620 (1) A $ 0 3,370 D

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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

Restricted Stock Units

$ 0 (2)

06/26/2018

A

1,870 (3)

(4)

(4)

Common Stock

1,870

$ 0

1,870

D

Stock Options

$ 112.14

06/26/2018

A

4,620 (5)

06/26/2019(6)

06/26/2028

Common Stock

4,620

$ 0

4,620

D

Restricted Stock Units

$ 0 (2)

06/28/2018

M

1,620 (3)

(7)

(7)

Common Stock

1,620

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Thompson Tommy G 1040 SPRING ST. SILVER SPRING, MD 20910	X

Signatures

/s/ John S. Hess, Jr. under Power of Attorney		06/28/2018
**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)	Shares received upon vesting of restricted stock units on June 28, 2018. Restricted stock units converted on a one-for-one basis into shares of common stock.
(2)	Each restricted stock unit represents the right to receive, following vesting, one share of United Therapeutics Corporation common stock.
(3)	Annual non-employee director grant of restricted stock units, which are awarded and priced each year on the date of the issuer's Annual Meeting of Shareholders.
(4)	The restricted stock units vest on the one-year anniversary of the grant date only if the reporting person attends at least 75% of the regularly scheduled meetings of the issuer's Board and his or her committee meetings from the date of grant until the date of the issuer's next annual meeting of shareholders. Shares will be issued to the reporting person upon vesting unless the reporting person has elected to defer receipt of shares.
(5)	Annual non-employee director grant of stock options, which are awarded and priced each year on the date of the issuer's Annual Meeting of Shareholders.
(6)	Award becomes fully vested on the one-year anniversary of the grant date only if the reporting person attends at least 75% of the regularly scheduled meetings of the issuer's Board and his or her committee meetings from the date of grant until the date of the issuer's next annual meeting of shareholders.
(7)	Restricted stock units were granted on June 28, 2017, and vested on June 28, 2018. The entire number of restricted stock units converted into shares of common stock upon vesting.

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