UTHR affiliate plans sale of 8,300 shares via exercise

United Therapeutics affiliate filed a Form 144 proposing the sale of 8,300 shares of Common Stock via a stock option exercise on 03/19/2026.

Rhea-AI Filing Summary

United Therapeutics affiliate filed a Form 144 proposing the sale of 8,300 shares of Common Stock via a stock option exercise on 03/19/2026. The filing lists multiple prior dispositions by the same holder in the past three months, including several 8,300-share transactions and an 11,000-share sale on 12/24/2025.

Insights

Securities Attorney

Routine affiliate resale via option exercise, consistent with standard insider dispositions.

The filing documents a proposed sale of 8,300 shares by an affiliate through a stock option exercise on 03/19/2026

Timing and mechanics are typical for a Form 144 notice; cash proceeds treatment is stated as Cash. Subsequent reporting will show whether the sale occurred.

Capital Markets Analyst

Multiple recent disposals by the same holder suggest ongoing liquidity activity, not a single large block.

The excerpt lists several past sales in the last three months—multiple entries of 8,300 shares and one 11,000-share transaction on 12/24/2025. These are sequential dispositions rather than a single transformative event.

Market impact depends on execution and scale relative to float; follow-up SEC filings will confirm completed transactions.

FAQ

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

What does the UTHR Form 144 disclose?

It discloses a proposed sale of 8,300 shares via a stock option exercise on 03/19/2026. The filing also lists multiple prior dispositions by the same holder in the past three months, including an 11,000-share sale on 12/24/2025.

Who is the reported holder in the UTHR Form 144?

The filing names transactions by Paul Mahon at a Maryland address and shows repeated past dispositions. The notice indicates the sale on 03/19/2026 is through a stock option exercise with proceeds shown as Cash.

Does the Form 144 say how the shares will be sold?

Yes; the excerpt states the sale method as a Stock Option Exercise and lists the proceeds treatment as Cash. Further execution details and whether the shares were sold on-market will appear in subsequent transaction filings if completed.

Are there recent sales by the same holder listed?

Yes; the filing lists several past dispositions in the last three months, including multiple 8,300-share entries and one 11,000-share sale dated 12/24/2025. These entries are presented as prior sales by the same holder.

Does the Form 144 confirm the sale is completed?

No; the Form 144 provides notice of a proposed sale of 8,300 shares on 03/19/2026 via option exercise. Completion and execution details are not confirmed in this notice and would appear in later SEC transaction reports.

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

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Accepted by SEC EDGAR 03/19/2026 - 04:05 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	4398610.73	43827686	03/19/2026	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	03/19/2026	Stock Option Exercise	Issuer			8300	03/19/2026	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	03/05/2026	8300	4010187.33
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	02/19/2026	8300	3953587.97
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	02/05/2026	8300	4010939.31
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	01/15/2026	8300	3900121.86
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	01/02/2026	8300	4029076.47
PAUL MAHON 1000 SPRING STREET SILVER SPRING MD 20910	Common	12/24/2025	11000	5644953.60

144: Remarks and Signature

Remarks
Date of Notice	03/19/2026
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)