Howard Horn files Form 144 reporting planned RARE share sales

Howard Horn reported proposed sales of Common Stock on Form 144.

Rhea-AI Filing Summary

Howard Horn reported proposed sales of Common Stock on Form 144. The filing lists multiple proposed dispositions by Howard Horn with transaction dates in 2026 and earlier, including individual sales of 4,683 shares for $116,606.70 on 05/01/2026 and 4,683 shares for $98,202.51 on 04/01/2026. The entries identify the securities as Performance and Restricted Stock and list Morgan Stanley Smith Barney LLC as the broker.

Key Figures

Sale 05/01/2026: 4,683 shares, $116,606.70 Sale 04/01/2026: 4,683 shares, $98,202.51 Sale 03/03/2026: 1,635 shares, $36,624.00 +2 more

5 metrics

Sale 05/01/2026 4,683 shares, $116,606.70 Entry dated <date>05/01/2026</date>

Sale 04/01/2026 4,683 shares, $98,202.51 Entry dated <date>04/01/2026</date>

Sale 03/03/2026 1,635 shares, $36,624.00 Entry dated <date>03/03/2026</date>

Sale 03/02/2026 (line 1) 3,119 shares, $70,302.26 Entry dated <date>03/02/2026</date>

Sale 03/02/2026 (line 2) 5,290 shares, $120,616.98 Entry dated <date>03/02/2026</date>

Key Terms

Form 144, Performance and Restricted Stock, Issuer, Broker

4 terms

Form 144 regulatory

"144: Securities To Be Sold"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Performance and Restricted Stock financial

"10/09/2024 | Performance and Restricted Stock"

Issuer regulatory

"Performance and Restricted Stock | ISSUER"

Broker financial

"Morgan Stanley Smith Barney LLC Executive Financial Services"

A broker is a licensed professional or firm that helps investors buy and sell financial assets by executing trades on their behalf, acting like a marketplace agent or matchmaker between buyers and sellers. Brokers matter to investors because they provide access to markets, handle order execution and paperwork, and can offer research or advice—services that affect trade speed, costs, and the quality of investment decisions.

FAQ

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

What does Howard Horn's Form 144 for RARE report?

It reports proposed sales of Common Stock by Howard Horn, filed on Form 144. The filing lists multiple proposed dispositions with dates in 2026, showing share counts and gross proceeds for each transaction and Morgan Stanley Smith Barney LLC as broker.

How many shares and proceeds are listed for the May 1, 2026 sale in the RARE Form 144?

The May 1, 2026 entry shows 4,683 shares with $116,606.70 gross proceeds. That line is presented among several transactions by Howard Horn; each row pairs a share count and a dollar amount.

What types of securities are identified in the RARE Form 144?

The filing identifies the securities as Performance and Restricted Stock. The securities section shows the instrument type and an issuer designation, and lists a broker address for trade processing.

Who is the broker listed on the RARE Form 144 filing?

Morgan Stanley Smith Barney LLC is listed as the broker for these transactions. The broker entry includes an address at 1 New York Plaza, 8th Floor, New York, NY, consistent with broker-mediated dispositions.

Do the Form 144 entries show multiple sale dates for Howard Horn?

Yes, the excerpt lists several sale dates in March, April, and May 2026. Specific lines include dates 03/02/2026, 03/03/2026, 04/01/2026, and 05/01/2026 with associated share counts and proceeds.

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

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Accepted by SEC EDGAR 06/01/2026 - 04:08 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	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	4653	110601.81	98489224	06/01/2026	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	10/09/2024	Performance and Restricted Stock	ISSUER			4653	10/09/2024	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	05/01/2026	4683	116606.70
HOWARD HORN 60 Leveroni Court Novato CA 94949	Common	04/01/2026	4683	98202.51
HOWARD HORN 60 Leveroni Court Novato CA 94949	Common	03/03/2026	1635	36624.00
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

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock and Performance Shares during the period of 10/09/2024 through 03/01/2026.
Date of Notice	06/01/2026
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)