X0306 4 2016-07-19 false 0001515673 Ultragenyx Pharmaceutical Inc. RARE 0001616640 AGARWAL SUNIL C/O ULTRAGENYX PHARMACEUTICAL INC. 60 LEVERONI COURT NOVATO CA 94949 false true false false Chief Medical Officer Common Stock 2016-07-19 4 F false 392.00 50.55 D 10177.00 D Common Stock 2016-07-21 4 S false 649.00 52.68 D 9528.00 D Represents shares surrendered to the Issuer by the Reporting Person to pay required tax withholdings due upon vesting of Restricted Stock Units granted to the Reporting Person under the 2014 Incentive Plan of the Issuer. The shares surrendered were valued based on the closing price of the common stock of the Issuer on the vesting date. Includes previously reported shares of common stock underlying Restricted Stock Units granted to the Reporting Person, which are subject to certain vesting conditions. Sales effected pursuant to a trading plan adopted by the Reporting Person pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended. /s/ Shalini Sharp, attorney in fact for Sunil Agarwal 2016-07-21