<?xml version='1.0' encoding='ASCII'?>
<!-- DFIN New ActiveDisclosure (SM) Inline XBRL Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2024-05-02T15:38:37.8722+00:00 -->
<!-- Copyright (c) 2024 Donnelly Financial Solutions, Inc. All Rights Reserved. -->
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xbrldi="http://xbrl.org/2006/xbrldi" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ix="http://www.xbrl.org/2013/inlineXBRL" xmlns:nonNumeric="http://www.xbrl.org/dtr/type/non-numeric" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:rare="http://www.ultragenyx.com/20240502" xmlns:dei="http://xbrl.sec.gov/dei/2023" xmlns:ixt-sec="http://www.sec.gov/inlineXBRL/transformation/2015-08-31" xmlns:ixt="http://www.xbrl.org/inlineXBRL/transformation/2022-02-16">
 <head>
  <title>8-K</title>
  <meta http-equiv="Content-Type" content="text/html"/>
 </head>
 <body style="margin: auto!important;padding: 8px;">
  <div style="display:none;"><ix:header><ix:hidden><ix:nonNumeric id="F_c09263e2-3859-4bd2-bc5d-2ffc971a8c7d" name="dei:AmendmentFlag" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4">false</ix:nonNumeric><ix:nonNumeric id="F_9b176c55-6fb5-43e9-b528-e5d3a11a7697" name="dei:EntityCentralIndexKey" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4">0001515673</ix:nonNumeric></ix:hidden><ix:references><link:schemaRef xlink:type="simple" xlink:href="rare-20240502.xsd"/></ix:references><ix:resources><xbrli:context id="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4"><xbrli:entity><xbrli:identifier scheme="http://www.sec.gov/CIK">0001515673</xbrli:identifier></xbrli:entity><xbrli:period><xbrli:startDate>2024-05-02</xbrli:startDate><xbrli:endDate>2024-05-02</xbrli:endDate></xbrli:period></xbrli:context></ix:resources></ix:header></div>
  <div style="padding-top:0.5in;min-height:0.5in;box-sizing:border-box;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></div>
  <p style="border-top:2.25pt double #000000;font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p>
  <p style="font-size:10pt;margin-top:5.75pt;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:18pt;font-family:'Calibri',sans-serif;min-width:fit-content;">UNITED STATES<br/>SECURITIES AND EXCHANGE COMMISSION<br/></span><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:12pt;font-family:'Calibri',sans-serif;min-width:fit-content;">WASHINGTON, D.C. 20549</span></p>
  <p style="margin-left:40%;font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;border-bottom:0.75pt solid #000000;margin-right:40%;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p>
  <p style="font-size:10pt;margin-top:10pt;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:18pt;font-family:'Calibri',sans-serif;min-width:fit-content;">FORM </span><span style="font-size:18pt;font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_d284f65e-241e-4854-9a92-81dad6baa785" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:DocumentType"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:18pt;font-family:'Calibri',sans-serif;min-width:fit-content;">8-K</span></ix:nonNumeric></span></p>
  <p style="margin-left:40%;font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;border-bottom:0.75pt solid #000000;margin-right:40%;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p>
  <p style="font-size:10pt;margin-top:9pt;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:12pt;font-family:'Calibri',sans-serif;min-width:fit-content;">CURRENT REPORT</span></p>
  <p style="font-size:10pt;margin-top:9pt;font-family:Times New Roman;margin-bottom:6pt;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:12pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934</span></p>
  <table style="border-spacing:0;table-layout:fixed;width:100.0%;border-collapse:separate;">
   <tr style="visibility:collapse;">
    <td style="width:100%;"/>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;text-align:left;">
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;margin-right:0.02986111111111111in;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">Date of Report (Date of earliest event reported): </span><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_ca7f997b-807a-446b-906a-1d89fd85efb2" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:DocumentPeriodEndDate" format="ixt:date-monthname-day-year-en"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;min-width:fit-content;">May 02, 2024</span></ix:nonNumeric></span></p></td>
   </tr>
  </table>
  <p style="margin-left:40%;font-size:10pt;margin-top:5pt;font-family:Times New Roman;margin-bottom:0;border-bottom:0.75pt solid #000000;margin-right:40%;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p>
  <p style="font-size:10pt;margin-top:5pt;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="font-size:24pt;font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_e6495490-311d-4c9b-b93b-674d52aa57de" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:EntityRegistrantName"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:24pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Ultragenyx Pharmaceutical Inc.</span></ix:nonNumeric></span></p>
  <p style="font-size:10pt;margin-top:3pt;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:7.5pt;font-family:'Calibri',sans-serif;min-width:fit-content;">(Exact name of Registrant as Specified in Its Charter)</span></p>
  <p style="margin-left:40%;font-size:10pt;margin-top:9pt;font-family:Times New Roman;margin-bottom:0;border-bottom:0.75pt solid #000000;margin-right:40%;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p>
  <table style="border-spacing:0;table-layout:fixed;width:100.0%;border-collapse:separate;">
   <tr style="visibility:collapse;">
    <td style="width:20%;"/>
    <td style="width:1%;"/>
    <td style="width:20%;"/>
    <td style="width:18%;"/>
    <td style="width:41%;"/>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;text-align:left;">
    <td colspan="3" style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_4ee93735-e143-4550-afcd-8de700057e07" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:EntityIncorporationStateCountryCode" format="ixt-sec:stateprovnameen"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;min-width:fit-content;">Delaware</span></ix:nonNumeric></span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_cfd4df5c-18f4-415d-a8ce-8e3718f95a16" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:EntityFileNumber"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;min-width:fit-content;">001-36276</span></ix:nonNumeric></span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_af654797-e74a-4355-8ba3-134c282cb856" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:EntityTaxIdentificationNumber"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;min-width:fit-content;">27-2546083</span></ix:nonNumeric></span></p></td>
   </tr>
   <tr style="height:7pt;word-break:break-word;white-space:pre-wrap;text-align:left;">
    <td colspan="3" style="padding-top:0.01in;vertical-align:top;"><p style="font-size:7.5pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">(State or Other Jurisdiction<br/>of Incorporation)</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:7.5pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">(Commission File Number)</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:7.5pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">(IRS Employer<br/>Identification No.)</span></p></td>
   </tr>
   <tr style="word-break:break-word;white-space:pre-wrap;text-align:left;">
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;text-align:left;">
    <td colspan="3" style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_c3fa215d-f0b9-473c-b76f-22f7f41798ec" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:EntityAddressAddressLine1"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;min-width:fit-content;">60 Leveroni Court</span></ix:nonNumeric></span></p></td>
    <td colspan="2" style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td colspan="3" style="padding-top:0.01in;vertical-align:top;text-align:left;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_83841f1b-4171-4a7d-9919-e8b0be7253e8" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:EntityAddressCityOrTown"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;min-width:fit-content;">Novato</span></ix:nonNumeric></span><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">, </span><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_15cca608-5c2f-40e6-be6a-f0d8072f215f" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:EntityAddressStateOrProvince" format="ixt-sec:stateprovnameen"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;min-width:fit-content;">California</span></ix:nonNumeric></span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:bottom;text-align:left;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_0f38dc68-6a8e-495d-b59c-74fd820358bd" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:EntityAddressPostalZipCode"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;min-width:fit-content;">94949</span></ix:nonNumeric></span></p></td>
   </tr>
   <tr style="height:7pt;word-break:break-word;white-space:pre-wrap;text-align:left;">
    <td colspan="3" style="padding-top:0.01in;vertical-align:top;"><p style="font-size:7.5pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">(Address of Principal Executive Offices)</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:7.5pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">(Zip Code)</span></p></td>
   </tr>
  </table>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">&#160;</span></p>
  <table style="border-spacing:0;table-layout:fixed;width:100.0%;border-collapse:separate;">
   <tr style="visibility:collapse;">
    <td style="width:100%;"/>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;text-align:left;">
    <td style="padding-top:0.125in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;margin-right:0.02986111111111111in;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">Registrant&#8217;s Telephone Number, Including Area Code:</span><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;"> </span><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_370b0072-0be0-4e84-85e5-d480c057a0e7" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:CityAreaCode"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;min-width:fit-content;">415</span></ix:nonNumeric></span><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;"> </span><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_b7d7bd6d-739c-4e0c-a88e-bbae41c5ce01" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:LocalPhoneNumber"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;min-width:fit-content;">483-8800</span></ix:nonNumeric></span></p></td>
   </tr>
  </table>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">&#160;</span></p>
  <table style="border-spacing:0;table-layout:fixed;width:100.0%;border-collapse:separate;">
   <tr style="visibility:collapse;">
    <td style="width:100%;"/>
   </tr>
   <tr style="word-break:break-word;white-space:pre-wrap;text-align:left;">
    <td style="padding-top:0.125in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
   </tr>
  </table>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:7.5pt;font-family:'Calibri',sans-serif;min-width:fit-content;">(Former Name or Former Address, if Changed Since Last Report)</span></p>
  <p style="margin-left:40%;font-size:10pt;margin-top:9.35pt;font-family:Times New Roman;margin-bottom:0;border-bottom:0.75pt solid #000000;margin-right:40%;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p>
  <p style="font-size:10pt;margin-top:9.35pt;font-family:Times New Roman;margin-bottom:6pt;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</span><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;"> </span></p>
  <div style="text-indent:-24.5pt;padding-left:24.5pt;margin-top:9pt;margin-bottom:0;text-align:left;"><span style="margin-right:1em;margin-right:1em;"><span style="font-size:10pt;font-family:Times New Roman;"><ix:nonNumeric id="F_c589a5e1-a565-4741-9eb2-1ee7c62f569c" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:WrittenCommunications" format="ixt-sec:boolballotbox"><span style="font-size:10pt;font-family:Times New Roman;">&#9744;</span></ix:nonNumeric></span></span><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</span></div>
  <div style="text-indent:-24.5pt;padding-left:24.5pt;margin-top:6pt;margin-bottom:0;text-align:left;"><span style="margin-right:1em;margin-right:1em;"><span style="font-size:10pt;font-family:Times New Roman;"><ix:nonNumeric id="F_3a4f37b3-8201-4110-a245-edc80d97f64d" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:SolicitingMaterial" format="ixt-sec:boolballotbox"><span style="font-size:10pt;font-family:Times New Roman;">&#9744;</span></ix:nonNumeric></span></span><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</span></div>
  <div style="text-indent:-24.5pt;padding-left:24.5pt;margin-top:6pt;margin-bottom:0;text-align:left;"><span style="margin-right:1em;margin-right:1em;"><span style="font-size:10pt;font-family:Times New Roman;"><ix:nonNumeric id="F_04de2ddb-62fb-4fb0-b0c2-0092170d354f" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:PreCommencementTenderOffer" format="ixt-sec:boolballotbox"><span style="font-size:10pt;font-family:Times New Roman;">&#9744;</span></ix:nonNumeric></span></span><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</span></div>
  <div style="text-indent:-24.5pt;padding-left:24.5pt;margin-top:6pt;margin-bottom:0;text-align:left;"><span style="margin-right:1em;margin-right:1em;"><span style="font-size:10pt;font-family:Times New Roman;"><ix:nonNumeric id="F_63db6c34-9201-44c9-a00a-c010f3d6d70e" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:PreCommencementIssuerTenderOffer" format="ixt-sec:boolballotbox"><span style="font-size:10pt;font-family:Times New Roman;">&#9744;</span></ix:nonNumeric></span></span><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</span></div>
  <p style="font-size:10pt;margin-top:9pt;font-family:Times New Roman;margin-bottom:9pt;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Securities registered pursuant to Section 12(b) of the Act:</span></p>
  <table style="border-spacing:0;table-layout:fixed;width:100.0%;border-collapse:separate;">
   <tr style="visibility:collapse;">
    <td style="width:38%;"/>
    <td style="width:1%;"/>
    <td style="width:15%;"/>
    <td style="width:1%;"/>
    <td style="width:45%;"/>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td style="padding-top:0.01in;vertical-align:top;border-bottom:0.25pt solid;text-align:left;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;"><br/>Title of each class</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;border-bottom:0.25pt solid #ffffff03;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;border-bottom:0.25pt solid;text-align:left;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">Trading<br/>Symbol(s)</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;border-bottom:0.25pt solid #ffffff03;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;border-bottom:0.25pt solid;text-align:left;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;"><br/>Name of each exchange on which registered</span></p></td>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td style="padding-top:0.01in;vertical-align:top;text-align:left;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_5a7efab1-a398-4202-8283-53fca3809a88" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:Security12bTitle"><span style="color:#000000;white-space:pre-wrap;min-width:fit-content;">Common Stock, $0.001 par value</span></ix:nonNumeric></span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;text-align:left;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_13f1a550-980d-4aa0-a4a3-8c704feed916" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:TradingSymbol"><span style="color:#000000;white-space:pre-wrap;min-width:fit-content;">RARE</span></ix:nonNumeric></span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;text-align:left;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:center;"><span style="font-family:'Calibri',sans-serif;"><ix:nonNumeric id="F_d5df31b1-2d91-43b2-9640-b40909c54628" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:SecurityExchangeName" format="ixt-sec:exchnameen"><span style="color:#000000;white-space:pre-wrap;min-width:fit-content;">Nasdaq Global Select Market</span></ix:nonNumeric></span></p></td>
   </tr>
  </table>
  <p style="font-size:10pt;margin-top:12pt;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (&#167;&#8239;230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (&#167;&#8239;240.12b-2 of this chapter).</span><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;"> </span></p>
  <p style="font-size:10pt;margin-top:9pt;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Emerging growth company </span><span style="font-size:10pt;"><ix:nonNumeric id="F_c85a7673-85ab-4194-ae56-1afd9029d0f0" contextRef="C_dde7d969-0e3d-4ba4-aba3-c23ed912e0d4" name="dei:EntityEmergingGrowthCompany" format="ixt-sec:boolballotbox"><span style="font-size:10pt;font-family:Times New Roman;">&#9744;</span></ix:nonNumeric></span></p>
  <p style="font-size:10pt;margin-top:9pt;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. </span><span style="font-size:10pt;font-family:Times New Roman;">&#9744;</span></p>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;border-bottom:2.25pt double #000000;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">&#160;</span></p>
  <div style="flex-direction:column;display:flex;padding-bottom:0.5in;min-height:0.5in;justify-content:flex-end;box-sizing:border-box;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></div>
  <hr style="page-break-after:always;"/>
  <div style="padding-top:0.5in;min-height:0.5in;box-sizing:border-box;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></div>
  <table style="border-spacing:0;table-layout:fixed;width:100.0%;border-collapse:separate;">
   <tr style="visibility:collapse;">
    <td style="width:11.54%;"/>
    <td style="width:88.46%;"/>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td style="vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">Item 2.02</span></p></td>
    <td style="vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">Results of Operations and Financial Condition.</span><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;"> </span></p></td>
   </tr>
  </table>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;"> </span></p>
  <p style="text-indent:4.533%;font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">On May 2, 2024, Ultragenyx Pharmaceutical Inc. issued a press release announcing its financial results for the three months ended March 31, 2024 (the &#8220;</span><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:10pt;font-family:'Calibri',sans-serif;font-style:italic;min-width:fit-content;">Press Release</span><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#8221;). A copy of the Press Release is furnished herewith as Exhibit 99.1.</span></p>
  <p style="text-indent:4.533%;font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p>
  <p style="text-indent:4.533%;font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;font-style:italic;min-width:fit-content;">The information set forth under Item 2.02 and in Exhibit 99.1 shall not be deemed &#8220;filed&#8221; for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.</span></p>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;font-style:italic;min-width:fit-content;"> </span></p>
  <table style="border-spacing:0;table-layout:fixed;width:100.0%;border-collapse:separate;">
   <tr style="visibility:collapse;">
    <td style="width:12%;"/>
    <td style="width:88%;"/>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td style="vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">Item 9.01</span></p></td>
    <td style="vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;">Financial Statements and Exhibits.</span><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-family:'Calibri',sans-serif;min-width:fit-content;"> </span></p></td>
   </tr>
  </table>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p>
  <table style="margin-left:auto;border-spacing:0;table-layout:fixed;width:100.0%;border-collapse:separate;margin-right:auto;">
   <tr style="visibility:collapse;">
    <td style="width:12%;"/>
    <td style="width:88%;"/>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td style="padding-top:0.01in;vertical-align:top;padding-right:0.01in;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;text-decoration:underline;font-family:'Calibri',sans-serif;min-width:fit-content;">Exhibit No.</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;padding-right:0.01in;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;text-decoration:underline;font-family:'Calibri',sans-serif;min-width:fit-content;">Description</span></p></td>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td style="padding-top:0.01in;vertical-align:top;padding-right:0.01in;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">99.1</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;padding-right:0.01in;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><a href="rare-ex99_1.htm"><span style="color:#0000ff;white-space:pre-wrap;text-decoration:underline;font-family:'Calibri',sans-serif;min-width:fit-content;">Press Release, dated May 2, 2024.</span></a></p></td>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td style="padding-top:0.01in;vertical-align:top;padding-right:0.01in;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">104</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;padding-right:0.01in;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">The cover page from the Company&#8217;s Current Report on Form 8-K dated May 2, 2024 formatted in Inline XBRL.</span></p></td>
   </tr>
  </table>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">&#160;</span></p>
  <div style="flex-direction:column;display:flex;padding-bottom:0.5in;min-height:0.5in;justify-content:flex-end;box-sizing:border-box;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></div>
  <hr style="page-break-after:always;"/>
  <div style="padding-top:0.5in;min-height:0.5in;box-sizing:border-box;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></div>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:9.35pt;text-align:center;"><span style="color:#000000;white-space:pre-wrap;font-weight:bold;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">SIGNATURES</span></p>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:9.35pt;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</span></p>
  <table style="border-spacing:0;table-layout:fixed;width:100.0%;border-collapse:separate;">
   <tr style="visibility:collapse;">
    <td style="width:6%;"/>
    <td style="width:44%;"/>
    <td style="width:4%;"/>
    <td style="width:46%;"/>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:4.3pt;font-family:Times New Roman;margin-bottom:4.3pt;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">Ultragenyx Pharmaceutical Inc.</span></p></td>
   </tr>
   <tr style="word-break:break-word;white-space:pre-wrap;">
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:4.3pt;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">Date:</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:4.3pt;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">May 2, 2024</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:4.3pt;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">By:</span><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;"> </span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;border-bottom:0.25pt solid;"><p style="font-size:10pt;margin-top:4.3pt;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">/s/ Howard Horn</span></p></td>
   </tr>
   <tr style="height:10pt;word-break:break-word;white-space:pre-wrap;">
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></td>
    <td style="padding-top:0.01in;vertical-align:top;"><p style="font-size:10pt;margin-top:0.7pt;font-family:Times New Roman;margin-bottom:9.35pt;text-align:left;"><span style="color:#000000;white-space:pre-wrap;font-family:'Calibri',sans-serif;min-width:fit-content;">Howard Horn<br/>Executive Vice President, Chief Financial Officer, Corporate Strategy</span></p></td>
   </tr>
  </table>
  <p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:Times New Roman;min-width:fit-content;">&#160;</span></p>
  <div style="flex-direction:column;display:flex;padding-bottom:0.5in;min-height:0.5in;justify-content:flex-end;box-sizing:border-box;"><p style="font-size:10pt;margin-top:0;font-family:Times New Roman;margin-bottom:0;text-align:left;"><span style="white-space:pre-wrap;font-size:10pt;font-family:'Calibri',sans-serif;min-width:fit-content;">&#160;</span></p></div>
  <hr style="page-break-after:always;"/>
 </body>
</html>
[{"type": "8-K", "sequence": "1", "filename": "rare-20240502.htm", "description": "8-K", "secsgml_size_bytes": 44173}]
{"company-data": {"conformed-name": "Ultragenyx Pharmaceutical Inc.", "cik": "0001515673", "assigned-sic": "2834", "organization-name": "03 Life Sciences", "irs-number": "272546083", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "001-36276", "film-number": "24908012"}, "business-address": {"street1": "60 LEVERONI COURT", "city": "NOVATO", "state": "CA", "zip": "94949", "phone": "415-483-8800"}, "mail-address": {"street1": "60 LEVERONI COURT", "city": "NOVATO", "state": "CA", "zip": "94949"}}
8-K
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM
8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported):
May 02, 2024
Ultragenyx Pharmaceutical Inc.
(Exact name of Registrant as Specified in Its Charter)
Delaware
001-36276
27-2546083
(State or Other Jurisdiction
of Incorporation)
(Commission File Number)
(IRS Employer
Identification No.)
60 Leveroni Court
Novato
,
California
94949
(Address of Principal Executive Offices)
(Zip Code)
Registrant's Telephone Number, Including Area Code:
415
483-8800
(Former Name or Former Address, if Changed Since Last Report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
☐
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each class
Trading
Symbol(s)
Name of each exchange on which registered
Common Stock, $0.001 par value
RARE
Nasdaq Global Select Market
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).
Emerging growth company
☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
☐
Item 2.02
Results of Operations and Financial Condition.
On May 2, 2024, Ultragenyx Pharmaceutical Inc. issued a press release announcing its financial results for the three months ended March 31, 2024 (the "
Press Release
"). A copy of the Press Release is furnished herewith as Exhibit 99.1.
The information set forth under Item 2.02 and in Exhibit 99.1 shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.
Item 9.01
Financial Statements and Exhibits.
Exhibit No.
Description
99.1
Press Release, dated May 2, 2024.
104
The cover page from the Company's Current Report on Form 8-K dated May 2, 2024 formatted in Inline XBRL.
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Ultragenyx Pharmaceutical Inc.
Date:
May 2, 2024
By:
/s/ Howard Horn
Howard Horn
Executive Vice President, Chief Financial Officer, Corporate Strategy