Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Huizenga Theodore Alan
   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
_____ Officer (give title below) _____ Other (specify below)
Controller and PAO
(Last)
(First)
(Middle)
C/O ULTRAGENYX PHARMACEUTICAL INC., 60 LEVERONI COURT		 3. Date of Earliest Transaction (Month/Day/Year)
11/16/2016
(Street)

NOVATO, CA 94949		 4. If Amendment, Date 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
(City)
(State)
(Zip)
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 11/16/2016   M   2,000 A $ 21 13,134 (1) (2) D  
Common Stock 11/16/2016   S   2,000 D $ 79.73 (3) 11,134 (1) (2) D  

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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 Underlying Securities
(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 of Derivative Security: 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
Stock Options (Right to buy) $ 21 11/16/2016   M     2,000   (4) 01/29/2024 Common Stock 2,000 $ 0 22,403 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Huizenga Theodore Alan
C/O ULTRAGENYX PHARMACEUTICAL INC.
60 LEVERONI COURT
NOVATO, CA 94949		       Controller and PAO  

Signatures

 /s/ Theodore A. Huizenga   11/18/2016
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) Includes previously reported shares of common stock underlying Restricted Stock Units granted to the Reporting Person, which are subject to certain vesting conditions.
(2) Due to a clerical error, the Forms 4 filed by the Reporting Person on each of June 19, 2015, December 18, 2015, January 19, 2016, February 17, 2016, May 24, 2016, and May 27, 2016 listed incorrect amounts in Column 5. The Form 4 filed on June 19, 2015 has been amended to reflect the correct share ownership following the reported transaction of 4,300 shares rather than 2,500 shares. The Form 4 filed on December 18, 2015 should have reflected 4,300 shares rather than 2,500 shares; the Form 4 filed on January 19, 2016 should have reflected 5,300 shares rather than 3,500 shares; the Form 4 filed on February 17, 2016 should have reflected 6,300 shares rather than 4,500 shares; the Form 4 filed May 24, 2016 should have reflected 6,134 shares rather than 4,334 shares; and the Form 4 filed on May 27, 2016 should have reflected 11,134 shares rather than 9,334 shares.
(3) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $79.70 to $79.82 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) 1/4 of the shares underlying the option vested on January 27, 2015, with 1/48th of the underlying shares vesting monthly thereafter, provided the Reporting Person has not terminated services with the Issuer.

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