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    CBO & EVP Kassberg Thomas Richard was granted 18,443 shares, sold $253,779 worth of shares (6,028 units at $42.10) and covered exercise/tax liability with 508 shares, increasing direct ownership by 5% to 264,730 units (SEC Form 4)

    3/4/25 8:19:57 PM ET
    $RARE
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    Get the next $RARE alert in real time by email
    SEC FORM 4 SEC Form 4
    FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549

    STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

    Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
    or Section 30(h) of the Investment Company Act of 1940
    OMB APPROVAL
    OMB Number: 3235-0287
    Estimated average burden
    hours per response: 0.5
      
    Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
      
    Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
    1. Name and Address of Reporting Person*
    Kassberg Thomas Richard

    (Last) (First) (Middle)
    C/O ULTRAGENYX PHARMACEUTICAL INC.
    60 LEVERONI COURT

    (Street)
    NOVATO CA 94949

    (City) (State) (Zip)
    2. Issuer Name and Ticker or Trading Symbol
    Ultragenyx Pharmaceutical Inc. [ RARE ]
    5. Relationship of Reporting Person(s) to Issuer
    (Check all applicable)
    Director 10% Owner
    X Officer (give title below) Other (specify below)
    CBO & EVP
    3. Date of Earliest Transaction (Month/Day/Year)
    03/01/2025
    4. If Amendment, Date of Original Filed (Month/Day/Year)
    6. Individual or Joint/Group Filing (Check Applicable Line)
    X Form filed by One Reporting Person
    Form filed by More than One Reporting Person
    Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
    1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
    Code V Amount (A) or (D) Price
    Common Stock 03/01/2025 A 18,443(1) A $0 271,266 D
    Common Stock 03/03/2025 S 6,028(2) D $42.1(3) 265,238 D
    Common Stock 03/03/2025 F 508(4) D $42.92 264,730(5) D
    Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
    (e.g., puts, calls, warrants, options, convertible securities)
    1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
    Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
    Explanation of Responses:
    1. Represents shares of common stock which previously granted performance stock units were converted on March 1, 2025 upon certification of the performance metric.
    2. Represents shares sold to pay required tax withholdings due to the vesting of RSUs.
    3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $41.77 to $42.90 inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.
    4. Represents shares surrendered to the Issuer by the Reporting Person to pay required tax withholdings due to the vesting of RSUs.
    5. Includes previously reported shares of common stock underlying RSUs granted to the Reporting Person, which are subject to certain vesting conditions.
    /s/ Karah Parschauer, attorney-in-fact 03/04/2025
    ** Signature of Reporting Person Date
    Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
    * If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
    ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
    Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
    Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
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