144 0001780113 XXXXXXXX LIVE 0001515673 Ultragenyx Pharmaceutical Inc. 001-36276 60 LEVERONI COURT NOVATO CA 94949 415-483-8800 Harris Erik Officer COMMON Morgan Stanley Smith Barney LLC Executive Services

200 W Civic Center Dr - 4th Floor SANDY UT 84070

6000 227779.84 71500000 09/05/2023 NASDAQ COMMON 03/01/2021 RESTRICTED STOCK ISSUER N 1974 03/01/2021 COMPENSATION COMMON 06/19/2021 RESTRICTED STOCK ISSUER N 438 06/19/2021 compensation common 07/06/2021 RESTRICTED STOCK ISSUER N 375 07/06/2021 COMPENSATION COMMON 07/06/2020 RESTRICTED STOCK ISSUER N 131 07/06/2020 COMPENSATION COMMON 03/01/2021 PERFORMANCE SHARES ISSUER N 2400 03/01/2021 COMPENSATION COMMON 05/06/2021 PERFORMANCE SHARES ISSUER N 300 05/06/2021 COMPENSATION COMMON 10/14/2020 PERFORMANCE SHARES ISSUER N 382 10/14/2020 COMPENSATION N ERIK HARRIS

60 LEVERONI COURT NOVATO CA 94949

RESTRICTED STOCK 06/20/2023 305 14701.00 09/05/2023 /S/ ERIK HARRIS