X0306 4 2016-01-14 false 0001515673 Ultragenyx Pharmaceutical Inc. RARE 0001603347 Huizenga Theodore Alan C/O ULTRAGENYX PHARMACEUTICAL INC. 60 LEVERONI COURT NOVATO CA 94949 false true false false Controller and PAO Common Stock 2016-01-14 4 M false 1000.00 21.00 A 3500.00 D Stock Option 21.00 2016-01-14 4 M false 1000.00 0.00 D 2024-01-29 Common Stock 1000.00 25403.00 D 1/4 of the shares underlying the option vested on January 27, 2015 and then 1/48th of the underlying shares will vest monthly thereafter, provided the Reporting Person has not terminated services with the Issuer. Due to clerical error, the Forms 4 filed by the Reporting Person on each of June 19, 2015 and December 18, 2015 listed incorrect amounts in Column 9. The Form 4 filed on June 19, 2015 should have listed 27,903 instead of 0 and the Form 4 filed on December 18, 2015 should have listed 26,403 instead of 13,955. /s/ Theodore A. Huizenga 2016-01-19