    <SEC-DOCUMENT>0001308179-26-000177-index.html : 20260327
    <SEC-HEADER>0001308179-26-000177.hdr.sgml : 20260327
    <ACCEPTANCE-DATETIME>20260327163120
    ACCESSION NUMBER:		0001308179-26-000177
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20251231
    FILED AS OF DATE:		20260327
    DATE AS OF CHANGE:		20260327
    EFFECTIVENESS DATE:		20260327

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Ultragenyx Pharmaceutical Inc.
    		CENTRAL INDEX KEY:			0001515673
    		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
    		ORGANIZATION NAME:           	03 Life Sciences
    		EIN:				272546083
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-36276
    		FILM NUMBER:		26807903

    	BUSINESS ADDRESS:
    		STREET 1:		60 LEVERONI COURT
    		CITY:			NOVATO
    		STATE:			CA
    		ZIP:			94949
    		BUSINESS PHONE:		415-483-8800

    	MAIL ADDRESS:
    		STREET 1:		60 LEVERONI COURT
    		CITY:			NOVATO
    		STATE:			CA
    		ZIP:			94949
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>ARS
    <SEQUENCE>1
    <FILENAME>rare015368-ars.pdf
    <DESCRIPTION>ANNUAL REPORT TO SECURITY HOLDERS
    <TEXT>
    Document 1 - file: rare015368-ars.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>