United Therapeutics officer to sell 8,300 shares

UNITED THERAPEUTICS CORPORATION (UTHR) received a notice that officer Paul Mahon intends to sell up to 8,300 shares of common stock under Rule 144 through Morgan Stanley Smith Barney LLC.

Rhea-AI Filing Summary

UNITED THERAPEUTICS CORPORATION (UTHR) received a notice that officer Paul Mahon intends to sell up to 8,300 shares of common stock under Rule 144 through Morgan Stanley Smith Barney LLC. The planned sale has an aggregate market value of $4,000,836.55 and relates to shares acquired via a stock option exercise on September 3, 2026.

The notice states that 42,890,692 shares of United Therapeutics common stock are outstanding, and lists several prior Rule 144 sales by Mahon over the past three months, each involving 8,300 shares on various dates in June, July, and August 2026.

Key Figures

Shares to be sold under Rule 144: 8,300 shares Aggregate market value of planned sale: $4,000,836.55 Shares outstanding: 42,890,692 shares +3 more

6 metrics

Shares to be sold under Rule 144 8,300 shares Planned sale of United Therapeutics common stock by Paul Mahon

Aggregate market value of planned sale $4,000,836.55 Value of 8,300 shares of United Therapeutics common stock listed for sale

Shares outstanding 42,890,692 shares United Therapeutics common stock outstanding as referenced in the notice

Prior sale on August 20, 2026 8,300 shares; $4,342,078.81 Rule 144 sale of United Therapeutics common stock by Paul Mahon

Prior sale on July 2, 2026 8,300 shares; $4,586,274.56 Rule 144 sale of United Therapeutics common stock by Paul Mahon

Prior sale on June 4, 2026 8,300 shares; $4,540,642.45 Rule 144 sale of United Therapeutics common stock by Paul Mahon

Key Terms

Rule 144, Stock Option Exercise, Securities To Be Sold, Securities Sold During The Past 3 Months

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Stock Option Exercise financial

"Common | 09/03/2026 | Stock Option Exercise | Issuer"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Securities To Be Sold regulatory

"144: Securities To Be Sold"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

What does the Form 144 filing for UTHR disclose about Paul Mahon?

It discloses that officer Paul Mahon plans to sell up to 8,300 shares of United Therapeutics common stock under Rule 144, through Morgan Stanley Smith Barney LLC, with the shares coming from a stock option exercise on September 3, 2026.

How many UTHR shares are covered by the planned Rule 144 sale?

The notice covers a planned sale of 8,300 shares of United Therapeutics common stock. The aggregate market value for these shares is listed as $4,000,836.55, based on trading on NASDAQ as of September 3, 2026.

How were the UTHR shares to be sold by Paul Mahon acquired?

The shares to be sold were acquired through a Stock Option Exercise from the issuer. The acquisition date is listed as September 3, 2026, with the form indicating the nature of payment as cash.

What past UTHR stock sales by Paul Mahon are disclosed?

The notice lists six prior sales of 8,300 shares each of United Therapeutics common stock on June 4, June 18, July 2, July 16, August 6, and August 20, 2026, with aggregate amounts such as $4,586,274.56 and $4,429,637.79 reported.

How many United Therapeutics (UTHR) shares are outstanding in this filing?

The filing states that there are 42,890,692 shares of United Therapeutics common stock outstanding. This figure provides context for the relative size of the 8,300-share planned sale under Rule 144.

What is the role of Morgan Stanley Smith Barney LLC in this UTHR Form 144?

Morgan Stanley Smith Barney LLC is listed as the broker for the planned sale of 8,300 shares of United Therapeutics common stock, with its Executive Financial Services group at New York Plaza identified as handling the transaction.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/03/2026 - 04:02 PM Accepted by SEC EDGAR 09/03/2026 - 04:01 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001231589
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	UNITED THERAPEUTICS CORPORATION
SEC File Number	000-26301
Address of Issuer	1000 SPRING STREET SILVER SPRING MARYLAND 20910
Phone	(301) 608-9292
Name of Person for Whose Account the Securities are To Be Sold	PAUL MAHON
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	8300	4000836.55	42890692	09/03/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/03/2026	Stock Option Exercise	Issuer			8300	09/03/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	08/20/2026	8300	4342078.81
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	08/06/2026	8300	4291512.51
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	07/16/2026	8300	4429637.79
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	07/02/2026	8300	4586274.56
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	06/18/2026	8300	4494840.93
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	06/04/2026	8300	4540642.45

144: Remarks and Signature

Remarks
Date of Notice	09/03/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	08/11/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Paul A. Mahon
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)