Howard Horn sells Common stock under Form 144

Howard Horn reported multiple sales of Common stock under a Form 144 notice.

Accepted by SEC EDGAR 04/01/2026 - 04:12 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Howard Horn reported multiple sales of Common stock under a Form 144 notice. The filing lists five dispositions dated between 01/02/2026 and 03/03/2026, with individual share amounts and gross proceeds for each sale.

The transactions are shown as sales of previously issued restricted or performance-based shares originating from the issuer, with each row listing the sale date, number of shares, and dollar proceeds.

Key Figures

Largest single disposition: 5,290 shares Other disposition example: 3,119 shares Additional disposition: 1,635 shares +2 more

5 metrics

Largest single disposition 5,290 shares sale on 03/02/2026 for $120,616.98

Other disposition example 3,119 shares sale on 03/02/2026 for $70,302.26

Additional disposition 1,635 shares sale on 03/03/2026 for $36,624.00

Earlier dispositions 3,061 and 3,150 shares sales on 02/02/2026 and 01/02/2026 for $72,117.16 and $71,946.00

Broker-dealer Morgan Stanley Smith Barney LLC listed intermediary at 1 New York Plaza

Key Terms

Form 144, Restricted Stock, Performance Shares, Issuer

4 terms

Form 144 regulatory

"reported multiple sales of Common stock under a Form 144 notice"

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.

Restricted Stock financial

"Common | 03/01/2026 | Restricted Stock | ISSUER"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Performance Shares financial

"Common | 03/01/2026 | Performance Shares | ISSUER"

Performance shares are a type of company stock given to executives or employees that only become theirs if the company meets specific goals, like hitting certain profits or growth targets. They motivate leaders to work toward the company’s success, because their additional shares depend on achieving these results.

Issuer regulatory

"Restricted Stock | ISSUER"

FAQ

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

What did Howard Horn report in the Form 144 for RARE?

Howard Horn reported five sales of Common stock, dated from 01/02/2026 to 03/03/2026, listing share counts and gross proceeds for each disposition. The filing shows the transactions originated from issuer-issued restricted or performance shares.

How many shares did Howard Horn sell on 03/02/2026 according to the filing?

On 03/02/2026 the filing lists two separate dispositions of Common stock by Howard Horn: one for 3,119 shares with proceeds of $70,302.26 and another for 5,290 shares with proceeds of $120,616.98.

What are the proceeds reported for the largest single disposition in the Form 144?

The largest single disposition shown is 5,290 shares on 03/02/2026 with reported gross proceeds of $120,616.98. Each disposition row in the filing pairs the share count with its corresponding dollar amount.

Do the Form 144 entries show the origin of the securities sold?

Yes. The securities in the listed rows are identified as Restricted Stock or Performance Shares issued by the issuer, with specific grant dates such as 03/01/2026, 10/09/2024, and 10/09/2025.

Who is the broker-dealer listed for executing these transactions?

The filing lists Morgan Stanley Smith Barney LLC at 1 New York Plaza as the intermediary. The broker-dealer name and address appear alongside the securities and sale details in the Form 144 rows.

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	4683	98202.51	96629788	04/01/2026	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	03/01/2026	Restricted Stock	ISSUER			938	03/01/2026	Not Applicable
Common	03/01/2026	Performance Shares	ISSUER			658	03/01/2026	Not Applicable
Common	10/09/2024	Restricted Stock	ISSUER			1744	10/09/2024	Not Applicable
Common	10/09/2025	Restricted Stock	ISSUER			1343	10/09/2025	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	03/03/2026	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
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

144: Remarks and Signature

Remarks
Date of Notice	04/01/2026
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)