Ultragenyx officer plans sale of 1,283 shares

An Ultragenyx officer filed a Rule 144 notice to sell 1,283 common shares sourced from equity awards and an employee stock purchase plan.

Rhea-AI Filing Summary

Ultragenyx Pharmaceutical Inc. (RARE) has an officer, Theodore Huizenga, filing a notice to sell common stock under Rule 144. The notice covers 1,283 shares of common stock, with an indicated aggregate market value of $17,461.63 as of September 15, 2026, to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.

The shares derive from 252 shares issued as Performance Stock Units dated October 14, 2020, 817 shares from Restricted Stock Units dated May 25, 2020, and 214 shares from the Employee Stock Purchase Plan dated October 31, 2020. The filing also reports that Huizenga sold 161 shares of common stock in the past three months on September 3, 2026, for $2,252.39.

Key Figures

Shares to be sold: 1,283 shares Aggregate market value: $17,461.63 Performance Stock Units shares: 252 shares +4 more

7 metrics

Shares to be sold 1,283 shares Common stock covered by the Rule 144 notice as of September 15, 2026

Aggregate market value $17,461.63 Estimated value of 1,283 shares to be sold as of September 15, 2026

Performance Stock Units shares 252 shares Portion of shares to be sold from PSUs dated October 14, 2020

Restricted Stock Units shares 817 shares Portion of shares to be sold from RSUs dated May 25, 2020

Employee Stock Purchase Plan shares 214 shares Portion of shares to be sold from ESPP dated October 31, 2020

Shares sold in past 3 months 161 shares Common shares sold on September 3, 2026

Proceeds from recent sale $2,252.39 Value of 161 shares sold on September 3, 2026

Key Terms

Rule 144, Performance Stock Units, Restricted Stock Units, Employee Stock Purchase Plan

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Performance Stock Units financial

"Common | 10/14/2020 | Performance Stock Units | Issuer"

Performance stock units are a type of company award that grants employees shares of stock only if certain performance goals are met. They motivate employees to work toward specific company achievements, aligning their interests with those of shareholders. For investors, they can influence a company's future stock supply and reflect management’s confidence in reaching key targets.

Restricted Stock Units financial

"Common | 05/25/2020 | Restricted Stock Units | Issuer"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Employee Stock Purchase Plan financial

"Common | 10/31/2020 | Employee Stock Purchase Plan | Issuer"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

FAQ

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

What does Ultragenyx (RARE) disclose in this Form 144 filing?

Ultragenyx reports that officer Theodore Huizenga filed a notice under Rule 144 to sell 1,283 shares of company common stock, with an indicated aggregate market value of $17,461.63, through Morgan Stanley Smith Barney LLC on NASDAQ as of September 15, 2026.

How many Ultragenyx (RARE) shares are covered by Theodore Huizenga’s planned Rule 144 sale?

The notice covers 1,283 shares of Ultragenyx common stock, reflecting an aggregate market value of $17,461.63 as of September 15, 2026. These shares are expected to be sold through Morgan Stanley Smith Barney LLC on NASDAQ.

What are the sources of the Ultragenyx (RARE) shares to be sold under this Form 144?

The 1,283 shares come from equity-related awards: 252 shares from Performance Stock Units dated October 14, 2020, 817 shares from Restricted Stock Units dated May 25, 2020, and 214 shares from the Employee Stock Purchase Plan dated October 31, 2020.

What prior Ultragenyx (RARE) sales by Theodore Huizenga are reported in the last three months?

The filing states that Theodore Huizenga sold 161 shares of Ultragenyx common stock on September 3, 2026, for total proceeds of $2,252.39 during the past three months.

Which broker is listed for the Ultragenyx (RARE) Form 144 sale?

The planned sale of 1,283 Ultragenyx common shares is listed as being executed through Morgan Stanley Smith Barney LLC Executive Financial Services, located at 1 New York Plaza, New York, with the shares to be sold on NASDAQ.

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

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Available on EDGAR 09/15/2026 - 04:34 PM Accepted by SEC EDGAR 09/15/2026 - 04:33 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	0001603347
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	THEODORE HUIZENGA
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	1283	17461.63	98588873	09/15/2026	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	10/14/2020	Performance Stock Units	Issuer			252	10/14/2020	N/A
Common	05/25/2020	Restricted Stock Units	Issuer			817	05/25/2020	N/A
Common	10/31/2020	Employee Stock Purchase Plan	Issuer			214	10/31/2020	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
THEODORE ALAN HUIZENGA 60 Leveroni Court Novato CA 94949	Common	09/03/2026	161	2252.39

144: Remarks and Signature

Remarks
Date of Notice	09/15/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/04/2026
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/ Theodore Huizenga
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)