Ultragenyx Pharmaceutical Inc. (RARE) Insider Ownership

Historic Insider Ownership Trends

As of May 14, 2026, the three largest insider holders of RARE are Emil D Kakkis (President Ceo, 2.22Mn shares), Emil D Kakkis (President Ceo, 2.16Mn shares), Emil D Kakkis (President Ceo, 735.74K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Emil D Kakkis President Ceo 0 2,223,985 05 Sep, 2024
Emil D Kakkis President Ceo 0 2,158,985 04 Mar, 2025
Emil D Kakkis President Ceo 735,739 0 20 Apr, 2026
Thomas Richard Kassberg Cbo Evp 264,730 0 04 Mar, 2025
Dennis Karl Huang Evp Chief Tech Ops Officer 147,845 0 20 Apr, 2026
John Richard Pinion - 133,142 0 20 Apr, 2026
Erik Harris Evp Chief Commercial Officer 118,410 0 20 Apr, 2026
Howard Horn Chief Financial Officer 115,025 0 20 Apr, 2026
Eric Crombez Evp And Chief Medical Officer 110,975 0 20 Apr, 2026
Karah Herdman Parschauer Evp And Chief Legal Officer 95,715 0 20 Apr, 2026
Theodore Alan Huizenga Svp, Chief Accounting Officer 68,911 0 24 Apr, 2026
Mardi Dier Cfo Executive Vice President 66,695 0 17 Oct, 2022
Camille L Bedrosian Evp And Chief Medical Officer 46,720 0 03 Mar, 2023
Michael Narachi - 32,690 0 19 May, 2025
Daniel G Welch - 32,690 0 19 May, 2025
Daniel G Welch - 32,690 0 19 May, 2025
Daniel G Welch - 32,690 0 19 May, 2025
Deborah Dunsire - 30,815 0 19 May, 2025
Matthew K Fust - 25,945 0 19 May, 2025
Shehnaaz Suliman - 25,940 0 19 May, 2025
Amrit Ray - 23,365 0 19 May, 2025
Lars Ekman - 17,745 0 28 Jun, 2022
Corazon (Corsee) D. Sanders - 15,344 0 23 Jun, 2025

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
22 Apr, 2026 Theodore Alan Huizenga Common Stock A 20,241 $0.00 68,911 D A
22 Apr, 2026 Theodore Alan Huizenga Common Stock A 20,241 $0.00 68,911 D A
22 Apr, 2026 Theodore Alan Huizenga Common Stock A 20,241 $0.00 68,911 D A
22 Apr, 2026 Theodore Alan Huizenga Common Stock A 20,241 $0.00 68,911 D A
22 Apr, 2026 Theodore Alan Huizenga Common Stock A 20,241 $0.00 68,911 D A
22 Apr, 2026 Theodore Alan Huizenga Stock Option (Right to Buy) A 7,348 $0.00 7,348 D A
22 Apr, 2026 Theodore Alan Huizenga Stock Option (Right to Buy) A 7,348 $0.00 7,348 D A
22 Apr, 2026 Theodore Alan Huizenga Stock Option (Right to Buy) A 7,348 $0.00 7,348 D A
22 Apr, 2026 Theodore Alan Huizenga Stock Option (Right to Buy) A 7,348 $0.00 7,348 D A
22 Apr, 2026 Theodore Alan Huizenga Stock Option (Right to Buy) A 7,348 $0.00 7,348 D A
16 Apr, 2026 Erik Harris Common Stock A 28,895 $0.00 118,410 D A
16 Apr, 2026 Emil D Kakkis Common Stock A 76,745 $0.00 735,739 D A
16 Apr, 2026 Karah Herdman Parschauer Common Stock A 28,895 $0.00 95,715 D A
16 Apr, 2026 Eric Crombez Common Stock A 34,674 $0.00 110,975 D A
16 Apr, 2026 Howard Horn Common Stock A 34,674 $0.00 115,025 D A
16 Apr, 2026 Dennis Karl Huang Common Stock A 23,116 $0.00 147,845 D A
16 Apr, 2026 John Richard Pinion Common Stock A 23,116 $0.00 133,142 D A
16 Apr, 2026 Dennis Karl Huang Stock Option (Right to Buy) A 79,936 $0.00 79,936 D A
16 Apr, 2026 John Richard Pinion Stock Option (Right to Buy) A 79,936 $0.00 79,936 D A
16 Apr, 2026 Erik Harris Stock Option (Right to Buy) A 49,960 $0.00 49,960 D A