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Ultragenyx Pharmaceutical Inc.

RARE
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001515673

In the last 90 days, Ultragenyx Pharmaceutical Inc. insiders filed 0 open-market purchases and 5 sales; 311 institutions reported holding it in 13F filings for Q2 2026, worth $3.56B in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Ultragenyx Pharmaceutical Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
5 filings
3 insiders, $339.7K in total
Insiders trading
3
Net value
−$339.7K
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Ultragenyx Pharmaceutical Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Ultragenyx Pharmaceutical Inc.
NameTitleLast reported holdingLast filingFilings, past year
Huizenga Theodore AlanSVP, Chief Accounting Officer67,863Sep 15, 20265
Parschauer Karah HerdmanEVP and Chief Legal Officer92,562Aug 4, 20265
Horn HowardChief Financial Officer96,295Aug 4, 202611
Sanders Corazon (Corsee) D.Director21,095Jun 15, 20262
Welch Daniel GDirector40,441May 18, 20261
Dunsire DeborahDirector38,566May 18, 20261
Narachi MichaelDirector40,441May 18, 20261
Fust Matthew KDirector33,696May 18, 20261
Suliman ShehnaazDirector27,951May 18, 20261
Ray AmritDirector31,116May 18, 20261
Crombez EricEVP and Chief Medical Officer111,189May 6, 20263
Kakkis Emil DPresident & CEO735,739Apr 20, 20262
Huang Dennis KarlSee Remarks147,845Apr 20, 20262
Pinion John RichardSee Remarks133,142Apr 20, 20262
Harris ErikEVP & Chief Commercial Officer118,410Apr 20, 20262
Kassberg Thomas RichardCBO & EVP264,730Mar 4, 20250
Bedrosian Camille LEVP and Chief Medical Officer46,720Mar 3, 20230
Dier MardiCFO & Executive Vice President66,695Oct 17, 20220
Ekman LarsDirector17,745Jun 28, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 15, 2026 (view filing)6:57 PM ETSep 15Same dayHuizenga Theodore AlanSVP, Chief Accounting OfficerSSale−1.28K$13.57−$17.4K−1.9%67.9K after10b5-1
Sep 8, 2026 (view filing)12:29 PM ETSep 35 daysHuizenga Theodore AlanSVP, Chief Accounting OfficerSSale−161$13.99−$2.25K−0.2%69.1K after
Aug 4, 2026 (view filing)3:15 PM ETAug 31 dayParschauer Karah HerdmanEVP and Chief Legal OfficerSSale−1.90K$24.92−$47.3K−2.0%92.6K after10b5-1
Aug 4, 2026 (view filing)3:13 PM ETAug 31 dayHorn HowardChief Financial OfficerSSale−4.70K$24.92−$117.0K−4.6%96.3K after10b5-1
Jul 6, 2026 (view filing)3:37 PM ETJul 15 daysHorn HowardChief Financial OfficerSSale−4.70K$33.13−$155.6K−4.4%101.0K after10b5-1
Jun 15, 2026 (view filing)Jun 15Same daySanders Corazon (Corsee) D.DirectorSSale−2.00K$25.05−$50.1K−8.7%21.1K after
Jun 15, 2026 (view filing)Jun 15Same dayParschauer Karah HerdmanEVP and Chief Legal OfficerSSale−1.90K$24.62−$46.8K−2.0%94.5K after10b5-1
Jun 1, 2026 (view filing)Jun 1Same dayHorn HowardChief Financial OfficerSSale−4.65K$23.77−$110.6K−4.2%105.7K after10b5-1
May 18, 2026 (view filing)May 18Same daySuliman ShehnaazDirectorSSale−5.74K$25.12−$144.2K−17.0%28.0K after10b5-1
May 6, 2026 (view filing)May 51 dayCrombez EricEVP and Chief Medical OfficerSSale−344$24.96−$8.59K−0.3%111.2K after
May 4, 2026 (view filing)May 13 daysHorn HowardChief Financial OfficerSSale−4.68K$24.90−$116.6K−4.1%110.3K after10b5-1
Apr 2, 2026 (view filing)Apr 11 dayHorn HowardChief Financial OfficerSSale−4.68K$20.97−$98.2K−5.5%80.4K after10b5-1
Mar 10, 2026 (view filing)Mar 6-104 daysParschauer Karah HerdmanEVP and Chief Legal OfficerSSale−9.53K$21.87−$208.3K−12.5%66.8K after2 lots
Mar 3, 2026 (view filing)Mar 21 dayPinion John RichardSee RemarksSSale−10.0K$22.80−$228.7K−8.4%110.0K after
Mar 3, 2026 (view filing)Mar 21 dayHarris ErikEVP & Chief Commercial OfficerSSale−10.5K$22.80−$240.3K−10.5%89.5K after
Mar 3, 2026 (view filing)Mar 21 dayKakkis Emil DPresident & CEOSSale−54.4K$22.80−$1.24M−7.6%659.0K after
Mar 3, 2026 (view filing)Mar 21 dayParschauer Karah HerdmanEVP and Chief Legal OfficerSSale−8.13K$22.80−$185.5K−9.6%76.3K after
Mar 3, 2026 (view filing)Mar 21 dayHuizenga Theodore AlanSVP, Chief Accounting OfficerSSale−1.63K$22.80−$37.2K−3.2%48.7K after
Mar 3, 2026 (view filing)Mar 2-31 dayHorn HowardChief Financial OfficerSSale−10.0K$22.65−$227.5K−10.6%85.0K after3 lots10b5-1
Mar 3, 2026 (view filing)Mar 21 dayCrombez EricEVP and Chief Medical OfficerSSale−7.03K$22.80−$160.3K−8.4%76.3K after
Feb 3, 2026 (view filing)Feb 21 dayHorn HowardChief Financial OfficerSSale−3.06K$23.56−$72.1K−3.3%88.9K after10b5-1
Jan 5, 2026 (view filing)Jan 23 daysHorn HowardChief Financial OfficerSSale−3.15K$22.84−$71.9K−3.3%92.0K after10b5-1
Dec 30, 2025 (view filing)Dec 291 dayHuizenga Theodore AlanSVP, Chief Accounting OfficerSSale−85$34.38−$2.92K−0.2%50.5K after
Dec 11, 2025 (view filing)Dec 101 dayHorn HowardChief Financial OfficerSSale−3.08K$36.38−$112.1K−3.1%95.1K after10b5-1
Oct 14, 2025 (view filing)Oct 131 dayHorn HowardChief Financial OfficerSSale−7.94K$31.51−$250.3K−7.5%98.2K after
Sep 19, 2025 (view filing)Sep 181 dayHuizenga Theodore AlanSVP, Chief Accounting OfficerSSale−64$29.17−$1.87K−0.1%50.2K after
Sep 12, 2025 (view filing)Sep 12Same dayParschauer Karah HerdmanEVP and Chief Legal OfficerSSale−2.45K$31.17−$76.4K−3.2%73.3K after
Sep 8, 2025 (view filing)Sep 53 daysHuizenga Theodore AlanSVP, Chief Accounting OfficerSSale−84$31.39−$2.64K−0.2%50.3K after
Jun 23, 2025 (view filing)Jun 203 daysSanders Corazon (Corsee) D.DirectorSSale−2.40K$37.39−$89.9K−13.6%15.3K after10b5-1
May 5, 2025 (view filing)Apr 21-May 514 daysLateCrombez EricEVP and Chief Medical OfficerSSale−762$37.93−$28.9K−1.1%71.5K after2 lots
Mar 10, 2025 (view filing)Mar 64 daysHorn HowardChief Financial OfficerSSale−1.78K$40.40−$72.1K−1.7%106.2K after
Mar 4, 2025 (view filing)Mar 31 dayKassberg Thomas RichardCBO & EVPSSale−6.03K$42.10−$253.8K−2.2%265.2K after
Mar 4, 2025 (view filing)Mar 31 dayParschauer Karah HerdmanEVP and Chief Legal OfficerSSale−12.8K$42.10−$540.8K−14.6%75.3K after
Mar 4, 2025 (view filing)Mar 31 dayCrombez EricEVP and Chief Medical OfficerSSale−8.95K$42.10−$376.6K−11.1%71.9K after
Mar 4, 2025 (view filing)Mar 31 dayPinion John RichardSee RemarksSSale−14.4K$42.10−$607.9K−11.8%107.8K after
Mar 4, 2025 (view filing)Mar 31 dayKakkis Emil DPresident & CEOSSale−73.4K$42.10−$3.09M−10.3%641.7K after10b5-1
Mar 4, 2025 (view filing)Feb 284 daysKakkis Emil DPresident & CEOSSale−25.0K$42.48−$1.06M−1.1%2.16M after10b5-1
Mar 4, 2025 (view filing)Mar 31 dayHarris ErikEVP & Chief Commercial OfficerSSale−15.1K$42.10−$635.8K−14.7%87.9K after
Mar 4, 2025 (view filing)Mar 31 dayHuizenga Theodore AlanSVP, Chief Accounting OfficerSSale−967$42.10−$40.7K−1.9%50.3K after
Mar 3, 2025 (view filing)Feb 274 daysParschauer Karah HerdmanEVP and Chief Legal OfficerSSale−2.99K$42.88−$128.2K−5.2%55.0K after2 lots
Dec 31, 2024 (view filing)Dec 301 dayKakkis Emil DPresident & CEOSSale−11.7K$42.23−$495.2K−0.5%2.18M after10b5-1
Dec 11, 2024 (view filing)Dec 101 dayKakkis Emil DPresident & CEOSSale−8.27K$50.00−$413.6K−0.4%2.20M after10b5-1
Oct 11, 2024 (view filing)Oct 101 dayHorn HowardChief Financial OfficerSSale−7.46K$52.76−$393.9K−7.5%92.3K after
Sep 5, 2024 (view filing)Sep 32 daysKakkis Emil DPresident & CEOSSale−20.0K$55.85−$1.12M−0.9%2.22M after10b5-1
Sep 5, 2024 (view filing)Sep 32 daysHuizenga Theodore AlanSVP, Chief Accounting OfficerSSale−91$56.19−$5.11K−0.2%41.6K after
Aug 7, 2024 (view filing)Aug 61 dayKakkis Emil DPresident & CEOSSale−20.0K$50.17−$1.00M−0.9%2.24M after10b5-1
Jul 3, 2024 (view filing)Jul 21 daySanders Corazon (Corsee) D.DirectorSSale−584$40.98−$23.9K−4.6%12.0K after10b5-1
Jun 12, 2024 (view filing)Jun 12Same dayParschauer Karah HerdmanEVP and Chief Legal OfficerSSale−9.81K$45.00−$441.3K−14.5%58.0K after10b5-1
Jun 10, 2024 (view filing)Jun 10Same daySanders Corazon (Corsee) D.DirectorSSale−1.74K$41.10−$71.4K−19.3%7.25K after10b5-1
May 3, 2024 (view filing)May 21 dayCrombez EricEVP and Chief Medical OfficerSSale−354$43.66−$15.5K−0.7%48.4K after