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Exhibit 32.1
CERTIFICATION PURSUANT TO SECTION 906 OF
THE SARBANES-OXLEY ACT OF 2002 (18 U.S.C. SECTION 1350)
In connection with the accompanying Quarterly Report of Ultragenyx Pharmaceutical Inc. (the “Company”) on Form 10-Q for the quarter ended September 30, 2022 (the “Report”), I, Emil D. Kakkis, M.D., Ph.D., as President and Chief Executive Officer of the Company, and Mardi C. Dier, as Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:
Dated: November 2, 2022 |
| /s/ Emil D. Kakkis |
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| Emil D. Kakkis, M.D., Ph.D. |
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| President and Chief Executive Officer |
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Dated: November 2, 2022 |
| /s/ Mardi C. Dier |
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| Mardi C. Dier |
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| Executive Vice President and Chief Financial Officer (Principal Financial Officer) |