Director files Form 144 to sell 4,438 shares

SUPN filed a Form 144 reporting a proposed sale of 4,438 common shares.

Rhea-AI Filing Summary

SUPN filed a Form 144 reporting a proposed sale of 4,438 common shares.

The notice lists restricted stock vesting under a registered plan on 02/19/2026 (544 shares), 02/22/2026 (1,003 shares) and 02/23/2026 (2,891 shares). The broker/agent listed is Morgan Stanley Smith Barney LLC.

Insights

Insider Transactions Analyst

Form 144 records a proposed resale of 4,438 vested shares across three vesting dates.

The filing documents restricted stock vesting events totaling 4,438 shares on 02/19/2026, 02/22/2026, and 02/23/2026. It lists Morgan Stanley Smith Barney LLC as the broker/agent associated with the notice.

Timing and execution details for any actual sales are not included; whether these shares are sold publicly or retained depends on the reporting person's subsequent transactions and any applicable plan restrictions.

FAQ

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

What does SUPN's Form 144 report?

It reports a proposed sale of 4,438 common shares. The filing lists restricted stock vesting on 02/19/2026 (544 shares), 02/22/2026 (1,003 shares), and 02/23/2026 (2,891 shares), with Morgan Stanley Smith Barney LLC named as broker.

Which vesting dates and share counts are listed in the SUPN Form 144?

The filing lists three vesting dates and counts. Shares vesting were 02/19/2026 (544 shares), 02/22/2026 (1,003 shares), and 02/23/2026 (2,891 shares), totaling 4,438 common shares in the notice.

Does the Form 144 confirm these shares have been sold?

No; Form 144 is a notice of a proposed sale, not proof of sale. The filing records the intent to sell or offer resale of vested restricted stock; actual sale execution and proceeds are not provided in the excerpt.

Who is listed as the broker or agent on the Form 144 for SUPN?

Morgan Stanley Smith Barney LLC is listed as the broker/agent. The filing shows the broker address as Executive Financial Services, 1 New York Plaza, 8th Floor, New York, NY 10004 associated with the securities to be sold.

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

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Accepted by SEC EDGAR 03/09/2026 - 04:43 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	0002117599
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	SUPERNUS PHARMACEUTICALS, INC.
SEC File Number	001-35518
Address of Issuer	9715 Key West Avenue Rockville MARYLAND 20850
Phone	301-838-2500
Name of Person for Whose Account the Securities are To Be Sold	WILLIAM TODD HORICH
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	4438	239652.00	57581712	03/09/2026	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	02/19/2026	Restricted stock vesting under a registered plan	Issuer			544	02/19/2026	Employee stock unit award(s)
Common	02/22/2026	Restricted stock vesting under a registered plan	Issuer			1003	02/22/2026	Employee stock unit award(s)
Common	02/23/2026	Restricted stock vesting under a registered plan	Issuer			2891	02/23/2026	Employee stock unit award(s)

* 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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	03/09/2026
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/ William Todd Horich
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)