Ultragenyx Pharmaceutical Inc. (RARE) Insider Ownership

Historic Ownership Trends

Based on data from the past 90 days ending December 12, 2025, Ultragenyx Pharmaceutical's three largest insider shareholders are Chief Financial Officer Howard Horn (98.23K shares), SVP And Chief Accounting Officer Theodore Alan Huizenga (50.24K shares), Director Lars Ekman (17.75K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares Report Date
Emil D Kakkis President & CEO 2,800,716 04 Mar, 2025
Thomas Richard Kassberg Cbo & EVP 264,730 04 Mar, 2025
Dennis Karl Huang 114,591 04 Mar, 2025
John Richard Pinion 108,428 04 Mar, 2025
Howard Horn Chief Financial Officer 95,146 11 Dec, 2025
Erik Harris EVP & Chief Commercial Officer 87,855 04 Mar, 2025
Karah Herdman Parschauer EVP And Chief Legal Officer 73,271 12 Sep, 2025
Eric Crombez EVP And Chief Medical Officer 71,530 05 May, 2025
William Aliski 66,849 28 Jun, 2021
Mardi Dier CFO & Executive Vice President 66,695 17 Oct, 2022
Theodore Alan Huizenga SVP And Chief Accounting Officer 50,242 19 Sep, 2025
Camille L Bedrosian EVP And Chief Medical Officer 46,720 03 Mar, 2023
Michael Narachi 32,690 19 May, 2025
Daniel G Welch 32,690 19 May, 2025
Deborah Dunsire 30,815 19 May, 2025
Matthew K Fust 25,945 19 May, 2025
Shehnaaz Suliman 25,940 19 May, 2025
Amrit Ray 23,365 19 May, 2025
Lars Ekman 17,745 28 Jun, 2022
Corazon (Corsee) D. Sanders 15,344 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
10 Dec, 2025 Howard Horn Common Stock D 3,081 $36.38 95,146 D S
13 Oct, 2025 Howard Horn Common Stock D 7,942 $31.51 98,227 D S
18 Sep, 2025 Theodore Alan Huizenga Common Stock D 64 $29.17 50,242 D S
18 Sep, 2025 Theodore Alan Huizenga - - 50,242 D
12 Sep, 2025 Karah Herdman Parschauer Common Stock D 2,450 $31.17 73,271 D S
12 Sep, 2025 Karah Herdman Parschauer - - 73,271 D
05 Sep, 2025 Theodore Alan Huizenga Common Stock D 84 $31.39 50,306 D S
20 Jun, 2025 Corazon (Corsee) D. Sanders Common Stock D 2,405 $37.39 15,344 D S
15 May, 2025 Michael Narachi Common Stock A 5,740 $0.00 32,690 D A
15 May, 2025 Corazon (Corsee) D. Sanders Common Stock A 5,740 $0.00 17,749 D A
15 May, 2025 Deborah Dunsire - - 30,815 D
15 May, 2025 Amrit Ray Common Stock A 5,740 $0.00 23,365 D A
15 May, 2025 Deborah Dunsire Common Stock A 5,740 $0.00 30,815 D A
15 May, 2025 Daniel G Welch Common Stock A 5,740 $0.00 32,690 D A
15 May, 2025 Shehnaaz Suliman Common Stock A 5,740 $0.00 25,940 D A
15 May, 2025 Matthew K Fust Common Stock A 5,740 $0.00 25,945 D A
21 Apr, 2025 Eric Crombez - - 71,680 D
21 Apr, 2025 Eric Crombez Common Stock D 242 $35.11 71,680 D S
05 May, 2025 Eric Crombez - - 71,530 D
05 May, 2025 Eric Crombez Common Stock D 520 $39.24 71,530 D S