X0306 4/A 2015-06-17 2015-06-19 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 2015-06-17 4 M false 1500.00 21.00 A 5800.00 D Common Stock 2015-06-17 4 S false 1500.00 94.80 D 4300.00 D Due to a clerical error, the number of shares beneficially owned following the reported transaction mistakenly excluded 1,800 shares owned by the Reporting Person. These 1,800 shares were also omitted from five Forms 4 filed by the Reporting Person after this Form 4 was filed. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $94.76 to $94.88 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. /s/ Theodore A. Huizenga 2016-11-18