United Therapeutics officer proposes $4.52M share sale

The proposed shares are attributed to a cash-paid stock option exercise from the issuer on October 15, 2026.

Rhea-AI Filing Summary

Paul Mahon, identified as an officer of United Therapeutics Corp, gave notice of a proposed sale of 8,300 common shares on October 15, 2026. The proposed sale has an aggregate market value of $4,517,709.09, and Morgan Stanley Smith Barney LLC is named as broker. The shares are listed as acquired from the issuer through a stock option exercise on October 15, 2026, with cash payment. The notice also lists six sales during the preceding three months, each involving 8,300 shares.

Key Figures

Proposed sale: 8,300 common shares Aggregate market value: $4,517,709.09 Shares outstanding: 42,890,692 shares

3 metrics

Proposed sale 8,300 common shares October 15, 2026

Aggregate market value $4,517,709.09 Proposed sale

Shares outstanding 42,890,692 shares Count listed with the proposed sale

Key Terms

Rule 144, Stock Option Exercise, Securities To Be Sold

3 terms

Rule 144 regulatory

"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

"Stock Option Exercise"

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"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many UTHR shares did Paul Mahon propose to sell?

Paul Mahon, identified as an officer of United Therapeutics Corp, gave notice of a proposed sale of 8,300 common shares on October 15, 2026. The proposed sale has an aggregate market value of $4,517,709.09.

What prior UTHR share sales did Paul Mahon report?

Paul Mahon's reported prior sales included six transactions of 8,300 common shares each, dated July 16, August 6, August 20, September 3, September 17, and October 1, 2026.

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

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Available on EDGAR 10/15/2026 - 04:23 PM EDT Accepted by SEC EDGAR 10/15/2026 - 04:22 PM EDT 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	4517709.09	42890692	10/15/2026	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	10/15/2026	Stock Option Exercise	Issuer			8300	10/15/2026	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	10/01/2026	8300	4689050.97
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	09/17/2026	8300	4129607.73
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	09/03/2026	8300	4000836.55
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

144: Remarks and Signature

Remarks
Date of Notice	10/15/2026
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)