Howard Horn files Form 144 for RARE sales

Howard Horn reported Form 144 sales of RARE securities.

Accepted by SEC EDGAR 03/03/2026 - 04:41 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Howard Horn reported Form 144 sales of RARE securities. The filing lists proposed sales of 674 performance shares and 961 restricted shares dated 03/01/2026. The form also discloses recent open-market dispositions by Howard Horn on 12/10/2025, 01/02/2026, 02/02/2026, and 03/02/2026 with individual share counts and gross proceeds shown.

FAQ

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

What does the RARE Form 144 filed by Howard Horn report?

The filing reports proposed sales of RARE securities by Howard Horn, including 674 performance shares and 961 restricted shares dated 03/01/2026. It lists multiple past dispositions with share counts and gross proceeds.

When were the listed securities to be sold in the RARE Form 144?

The securities identified for sale are dated 03/01/2026. The form specifies the types as Performance Shares (674) and Restricted Stock (961) with the same date next to each entry.

What recent sales by Howard Horn are shown on the filing?

The filing shows sales on 12/10/2025, 01/02/2026, 02/02/2026, and 03/02/2026 with per-transaction share counts of 3081, 3150, 3061, 3119 and reported gross proceeds for each.

Which broker/dealer is named on the RARE Form 144?

The form lists Morgan Stanley Smith Barney LLC at 1 New York Plaza as the broker/dealer. The filing shows NASDAQ as the exchange and includes filing identifiers and dates.

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

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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	0001786335
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	ULTRAGENYX PHARMACEUTICAL INC.
SEC File Number	001-36276
Address of Issuer	60 Leveroni Court Novato CALIFORNIA 94949
Phone	(415) 483-8800
Name of Person for Whose Account the Securities are To Be Sold	HOWARD HORN
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	1635	36624.00	96629788	03/03/2026	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	03/01/2026	Performance Shares	ISSUER			674	03/01/2026	Not Applicable
Common	03/01/2026	Restricted Stock	ISSUER			961	03/01/2026	Not Applicable

* 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
HOWARD HORN 60 Leveroni Court Novato CA 94949	Common	03/02/2026	3119	70302.26
HOWARD HORN 60 Leveroni Court Novato CA 94949	Common	03/02/2026	5290	120616.98
HOWARD HORN 60 Leveroni Court Novato CA 94949	Common	02/02/2026	3061	72117.16
HOWARD HORN 60 Leveroni Court Novato CA 94949	Common	01/02/2026	3150	71946.00
HOWARD HORN 60 Leveroni Court Novato CA 94949	Common	12/10/2025	3081	112086.78

144: Remarks and Signature

Remarks
Date of Notice	03/03/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/02/2025
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/ Howard Horn
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)