RARE

Ultragenyx Pharmaceutical Inc.

Insider trading activity for Ultragenyx Pharmaceutical Inc., straight from SEC Form 4 filings. Net figures below count open-market buys and sales only — grants, option exercises and tax withholding are excluded because they are compensation, not decisions to trade.

Past 3 months

-$339.7K

net selling

Bought(0 · 0 insiders): $0
Sold(5 · 3 insiders): $339.7K

Past 6 months

-$914.7K

net selling

Bought(0 · 0 insiders): $0
Sold(12 · 6 insiders): $914.7K

Past 12 months

-$4M

net selling

Bought(0 · 0 insiders): $0
Sold(28 · 9 insiders): $4M

Transaction history

The 87 most recent Form 4 transactions.

Open in screener →

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Insider	Role	Type	Shares	Price	Value	Δ Own	Filing
Sep 15	Huizenga Theodore Alan	SVP, Chief Accounting…	SSELL◷	1,283	$13.57	$17.4K	-1.9%	Open the original filing on SEC.gov
Sep 3	Huizenga Theodore Alan	SVP, Chief Accounting…	SSELL	161	$13.99	$2.3K	-0.2%	Open the original filing on SEC.gov
Aug 3	Parschauer Karah Herdman	EVP and Chief Legal…	SSELL◷	1,900	$24.92	$47.3K	-2.0%	Open the original filing on SEC.gov
Aug 3	Horn Howard	Chief Financial Officer	SSELL◷	4,696	$24.92	$117K	-4.7%	Open the original filing on SEC.gov
Jul 1	Horn Howard	Chief Financial Officer	SSELL◷	4,698	$33.13	$155.6K	-4.5%	Open the original filing on SEC.gov
Jun 15	Sanders Corazon…	Director	SSELL	2,000	$25.05	$50.1K	-8.7%	Open the original filing on SEC.gov
Jun 15	Parschauer Karah Herdman	EVP and Chief Legal…	SSELL◷	1,899	$24.62	$46.8K	-2.0%	Open the original filing on SEC.gov
Jun 1	Horn Howard	Chief Financial Officer	SSELL◷	4,653	$23.77	$110.6K	-4.2%	Open the original filing on SEC.gov
May 18	Suliman Shehnaaz	Director	SSELL◷	5,740	$25.12	$144.2K	-17.0%	Open the original filing on SEC.gov
May 14	Welch Daniel G	Director	AGRANT◆	14,058	—	—	—	Open the original filing on SEC.gov
May 14	Welch Daniel G	Director	AGRANT	7,751	—	—	+23.7%	Open the original filing on SEC.gov
May 14	Sanders Corazon…	Director	AGRANT◆	14,058	—	—	—	Open the original filing on SEC.gov
May 14	Sanders Corazon…	Director	AGRANT	7,751	—	—	+50.5%	Open the original filing on SEC.gov
May 14	Suliman Shehnaaz	Director	AGRANT◷◆	14,058	—	—	—	Open the original filing on SEC.gov
May 14	Suliman Shehnaaz	Director	AGRANT◷	7,751	—	—	+29.9%	Open the original filing on SEC.gov
May 14	Ray Amrit	Director	AGRANT◆	14,058	—	—	—	Open the original filing on SEC.gov
May 14	Ray Amrit	Director	AGRANT	7,751	—	—	+33.2%	Open the original filing on SEC.gov
May 14	Narachi Michael	Director	AGRANT◆	14,058	—	—	—	Open the original filing on SEC.gov
May 14	Narachi Michael	Director	AGRANT	7,751	—	—	+23.7%	Open the original filing on SEC.gov
May 14	Fust Matthew K	Director	AGRANT◆	14,058	—	—	—	Open the original filing on SEC.gov
May 14	Fust Matthew K	Director	AGRANT	7,751	—	—	+29.9%	Open the original filing on SEC.gov
May 14	Dunsire Deborah	Director	AGRANT◆	14,058	—	—	—	Open the original filing on SEC.gov
May 14	Dunsire Deborah	Director	AGRANT	7,751	—	—	+25.1%	Open the original filing on SEC.gov
May 5	Crombez Eric	EVP and Chief Medical…	SSELL	344	$24.96	$8.6K	-0.3%	Open the original filing on SEC.gov
May 1	Horn Howard	Chief Financial Officer	SSELL◷	4,683	$24.90	$116.6K	-4.1%	Open the original filing on SEC.gov
Apr 22	Huizenga Theodore Alan	SVP, Chief Accounting…	AGRANT◆	7,348	—	—	—	Open the original filing on SEC.gov
Apr 22	Huizenga Theodore Alan	SVP, Chief Accounting…	AGRANT	20,241	—	—	+41.6%	Open the original filing on SEC.gov
Apr 16	Pinion John Richard	See Remarks	AGRANT◆	79,936	—	—	—	Open the original filing on SEC.gov
Apr 16	Pinion John Richard	See Remarks	AGRANT	23,116	—	—	+21.0%	Open the original filing on SEC.gov
Apr 16	Parschauer Karah Herdman	EVP and Chief Legal…	AGRANT◆	49,960	—	—	—	Open the original filing on SEC.gov
Apr 16	Parschauer Karah Herdman	EVP and Chief Legal…	AGRANT	28,895	—	—	+43.2%	Open the original filing on SEC.gov
Apr 16	Kakkis Emil D	President & CEO	AGRANT◆	132,693	—	—	—	Open the original filing on SEC.gov
Apr 16	Kakkis Emil D	President & CEO	AGRANT	76,745	—	—	+11.7%	Open the original filing on SEC.gov
Apr 16	Huang Dennis Karl	See Remarks	AGRANT◆	79,936	—	—	—	Open the original filing on SEC.gov
Apr 16	Huang Dennis Karl	See Remarks	AGRANT	23,116	—	—	+18.5%	Open the original filing on SEC.gov
Apr 16	Horn Howard	Chief Financial Officer	AGRANT◆	59,952	—	—	—	Open the original filing on SEC.gov
Apr 16	Horn Howard	Chief Financial Officer	AGRANT	34,674	—	—	+43.1%	Open the original filing on SEC.gov
Apr 16	Harris Erik	EVP & Chief Commercial…	AGRANT◆	49,960	—	—	—	Open the original filing on SEC.gov
Apr 16	Harris Erik	EVP & Chief Commercial…	AGRANT	28,895	—	—	+32.3%	Open the original filing on SEC.gov
Apr 16	Crombez Eric	EVP and Chief Medical…	AGRANT◆	59,952	—	—	—	Open the original filing on SEC.gov
Apr 16	Crombez Eric	EVP and Chief Medical…	AGRANT	34,674	—	—	+45.4%	Open the original filing on SEC.gov
Apr 1	Horn Howard	Chief Financial Officer	SSELL◷	4,683	$20.97	$98.2K	-5.5%	Open the original filing on SEC.gov
Mar 10	Parschauer Karah Herdman	EVP and Chief Legal…	SSELL	3,508	$22.67	$79.5K	-5.0%	Open the original filing on SEC.gov
Mar 6	Parschauer Karah Herdman	EVP and Chief Legal…	SSELL	6,018	$21.40	$128.8K	-7.9%	Open the original filing on SEC.gov
Mar 3	Horn Howard	Chief Financial Officer	SSELL◷	1,635	$22.40	$36.6K	-1.9%	Open the original filing on SEC.gov
Mar 2	Pinion John Richard	See Remarks	SSELL	10,029	$22.80	$228.7K	-8.3%	Open the original filing on SEC.gov
Mar 2	Parschauer Karah Herdman	EVP and Chief Legal…	SSELL	8,135	$22.80	$185.5K	-9.6%	Open the original filing on SEC.gov
Mar 2	Kakkis Emil D	President & CEO	SSELL	54,404	$22.80	$1.2M	-7.6%	Open the original filing on SEC.gov
Mar 2	Huizenga Theodore Alan	SVP, Chief Accounting…	SSELL	1,632	$22.80	$37.2K	-3.2%	Open the original filing on SEC.gov
Mar 2	Huizenga Theodore Alan	SVP, Chief Accounting…	FTAX	148	$23.39	$3.5K	-0.3%	Open the original filing on SEC.gov
Mar 2	Huang Dennis Karl	See Remarks	FTAX	999	$23.39	$23.4K	-0.8%	Open the original filing on SEC.gov
Mar 2	Horn Howard	Chief Financial Officer	SSELL◷	3,119	$22.54	$70.3K	-3.5%	Open the original filing on SEC.gov
Mar 2	Horn Howard	Chief Financial Officer	SSELL◷	5,290	$22.80	$120.6K	-5.6%	Open the original filing on SEC.gov
Mar 2	Harris Erik	EVP & Chief Commercial…	SSELL	10,539	$22.80	$240.3K	-10.5%	Open the original filing on SEC.gov
Mar 2	Crombez Eric	EVP and Chief Medical…	SSELL	7,029	$22.80	$160.3K	-8.4%	Open the original filing on SEC.gov
Mar 1	Pinion John Richard	See Remarks	AGRANT	11,137	—	—	+10.3%	Open the original filing on SEC.gov
Mar 1	Parschauer Karah Herdman	EVP and Chief Legal…	AGRANT	11,137	—	—	+15.2%	Open the original filing on SEC.gov
Mar 1	Kakkis Emil D	President & CEO	AGRANT	71,177	—	—	+11.1%	Open the original filing on SEC.gov
Mar 1	Huang Dennis Karl	See Remarks	AGRANT	11,137	—	—	+9.7%	Open the original filing on SEC.gov
Mar 1	Horn Howard	Chief Financial Officer	AGRANT◷	6,143	—	—	+6.9%	Open the original filing on SEC.gov
Mar 1	Harris Erik	EVP & Chief Commercial…	AGRANT	11,643	—	—	+13.3%	Open the original filing on SEC.gov
Mar 1	Crombez Eric	EVP and Chief Medical…	AGRANT	11,643	—	—	+16.3%	Open the original filing on SEC.gov
Feb 2	Horn Howard	Chief Financial Officer	SSELL◷	3,061	$23.56	$72.1K	-3.3%	Open the original filing on SEC.gov
Jan 2	Horn Howard	Chief Financial Officer	SSELL◷	3,150	$22.84	$71.9K	-3.3%	Open the original filing on SEC.gov
Dec 29, 2025	Huizenga Theodore Alan	SVP, Chief Accounting…	SSELL	85	$34.38	$2.9K	-0.2%	Open the original filing on SEC.gov
Dec 10, 2025	Horn Howard	Chief Financial Officer	SSELL◷	3,081	$36.38	$112.1K	-3.1%	Open the original filing on SEC.gov
Oct 13, 2025	Horn Howard	Chief Financial Officer	SSELL	7,942	$31.51	$250.3K	-7.5%	Open the original filing on SEC.gov
Sep 18, 2025	Huizenga Theodore Alan	SVP, Chief Accounting…	SSELL	64	$29.17	$1.9K	-0.1%	Open the original filing on SEC.gov
Sep 12, 2025	Parschauer Karah Herdman	EVP and Chief Legal…	SSELL	2,450	$31.17	$76.4K	-3.2%	Open the original filing on SEC.gov
Sep 5, 2025	Huizenga Theodore Alan	SVP, Chief Accounting…	SSELL	84	$31.39	$2.6K	-0.2%	Open the original filing on SEC.gov
Jun 20, 2025	Sanders Corazon…	Director	SSELL◷	2,405	$37.39	$89.9K	-13.6%	Open the original filing on SEC.gov
May 15, 2025	Welch Daniel G	Director	AGRANT◆	10,787	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Welch Daniel G	Director	AGRANT	5,740	—	—	+21.3%	Open the original filing on SEC.gov
May 15, 2025	Sanders Corazon…	Director	AGRANT◆	10,787	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Sanders Corazon…	Director	AGRANT	5,740	—	—	+47.8%	Open the original filing on SEC.gov
May 15, 2025	Suliman Shehnaaz	Director	AGRANT◆	10,787	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Suliman Shehnaaz	Director	AGRANT	5,740	—	—	+28.4%	Open the original filing on SEC.gov
May 15, 2025	Ray Amrit	Director	AGRANT◆	10,787	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Ray Amrit	Director	AGRANT	5,740	—	—	+32.6%	Open the original filing on SEC.gov
May 15, 2025	Narachi Michael	Director	AGRANT◆	10,787	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Narachi Michael	Director	AGRANT	5,740	—	—	+21.3%	Open the original filing on SEC.gov
May 15, 2025	Fust Matthew K	Director	AGRANT◆	10,787	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Fust Matthew K	Director	AGRANT	5,740	—	—	+28.4%	Open the original filing on SEC.gov
May 15, 2025	Dunsire Deborah	Director	AGRANT◆	10,787	—	—	—	Open the original filing on SEC.gov
May 15, 2025	Dunsire Deborah	Director	AGRANT	5,740	—	—	+22.9%	Open the original filing on SEC.gov
May 5, 2025	Crombez Eric	EVP and Chief Medical…	SSELL	520	$39.24	$20.4K	-0.7%	Open the original filing on SEC.gov
Apr 21, 2025	Crombez Eric	EVP and Chief Medical…	SSELL	242	$35.11	$8.5K	-0.3%	Open the original filing on SEC.gov

SSELL◷$17.4K

Huizenga Theodore Alan · SVP, Chief Account…Sep 15

1,283 sh @ $13.57 · -1.9% own

SSELL$2.3K

Huizenga Theodore Alan · SVP, Chief Account…Sep 3

161 sh @ $13.99 · -0.2% own

SSELL◷$47.3K

Parschauer Karah Herdman · EVP and Chief…Aug 3

1,900 sh @ $24.92 · -2.0% own

SSELL◷$117K

Horn Howard · Chief Financial…Aug 3

4,696 sh @ $24.92 · -4.7% own

SSELL◷$155.6K

Horn Howard · Chief Financial…Jul 1

4,698 sh @ $33.13 · -4.5% own

SSELL$50.1K

Sanders Corazon… · DirectorJun 15

2,000 sh @ $25.05 · -8.7% own

SSELL◷$46.8K

Parschauer Karah Herdman · EVP and Chief…Jun 15

1,899 sh @ $24.62 · -2.0% own

SSELL◷$110.6K

Horn Howard · Chief Financial…Jun 1

4,653 sh @ $23.77 · -4.2% own

SSELL◷$144.2K

Suliman Shehnaaz · DirectorMay 18

5,740 sh @ $25.12 · -17.0% own

AGRANT◆—

Welch Daniel G · DirectorMay 14

14,058 sh

AGRANT—

Welch Daniel G · DirectorMay 14

7,751 sh · +23.7% own

AGRANT◆—

Sanders Corazon… · DirectorMay 14

14,058 sh

AGRANT—

Sanders Corazon… · DirectorMay 14

7,751 sh · +50.5% own

AGRANT◷◆—

Suliman Shehnaaz · DirectorMay 14

14,058 sh

AGRANT◷—

Suliman Shehnaaz · DirectorMay 14

7,751 sh · +29.9% own

AGRANT◆—

Ray Amrit · DirectorMay 14

14,058 sh

AGRANT—

Ray Amrit · DirectorMay 14

7,751 sh · +33.2% own

AGRANT◆—

Narachi Michael · DirectorMay 14

14,058 sh

AGRANT—

Narachi Michael · DirectorMay 14

7,751 sh · +23.7% own

AGRANT◆—

Fust Matthew K · DirectorMay 14

14,058 sh

AGRANT—

Fust Matthew K · DirectorMay 14

7,751 sh · +29.9% own

AGRANT◆—

Dunsire Deborah · DirectorMay 14

14,058 sh

AGRANT—

Dunsire Deborah · DirectorMay 14

7,751 sh · +25.1% own

SSELL$8.6K

Crombez Eric · EVP and Chief…May 5

344 sh @ $24.96 · -0.3% own

SSELL◷$116.6K

Horn Howard · Chief Financial…May 1

4,683 sh @ $24.90 · -4.1% own

AGRANT◆—

Huizenga Theodore Alan · SVP, Chief Account…Apr 22

7,348 sh

AGRANT—

Huizenga Theodore Alan · SVP, Chief Account…Apr 22

20,241 sh · +41.6% own

AGRANT◆—

Pinion John Richard · See RemarksApr 16

79,936 sh

AGRANT—

Pinion John Richard · See RemarksApr 16

23,116 sh · +21.0% own

AGRANT◆—

Parschauer Karah Herdman · EVP and Chief…Apr 16

49,960 sh

AGRANT—

Parschauer Karah Herdman · EVP and Chief…Apr 16

28,895 sh · +43.2% own

AGRANT◆—

Kakkis Emil D · President & CEOApr 16

132,693 sh

AGRANT—

Kakkis Emil D · President & CEOApr 16

76,745 sh · +11.7% own

AGRANT◆—

Huang Dennis Karl · See RemarksApr 16

79,936 sh

AGRANT—

Huang Dennis Karl · See RemarksApr 16

23,116 sh · +18.5% own

AGRANT◆—

Horn Howard · Chief Financial…Apr 16

59,952 sh

AGRANT—

Horn Howard · Chief Financial…Apr 16

34,674 sh · +43.1% own

AGRANT◆—

Harris Erik · EVP & Chief…Apr 16

49,960 sh

AGRANT—

Harris Erik · EVP & Chief…Apr 16

28,895 sh · +32.3% own

AGRANT◆—

Crombez Eric · EVP and Chief…Apr 16

59,952 sh

AGRANT—

Crombez Eric · EVP and Chief…Apr 16

34,674 sh · +45.4% own

SSELL◷$98.2K

Horn Howard · Chief Financial…Apr 1

4,683 sh @ $20.97 · -5.5% own

SSELL$79.5K

Parschauer Karah Herdman · EVP and Chief…Mar 10

3,508 sh @ $22.67 · -5.0% own

SSELL$128.8K

Parschauer Karah Herdman · EVP and Chief…Mar 6

6,018 sh @ $21.40 · -7.9% own

SSELL◷$36.6K

Horn Howard · Chief Financial…Mar 3

1,635 sh @ $22.40 · -1.9% own

SSELL$228.7K

Pinion John Richard · See RemarksMar 2

10,029 sh @ $22.80 · -8.3% own

SSELL$185.5K

Parschauer Karah Herdman · EVP and Chief…Mar 2

8,135 sh @ $22.80 · -9.6% own

SSELL$1.2M

Kakkis Emil D · President & CEOMar 2

54,404 sh @ $22.80 · -7.6% own

SSELL$37.2K

Huizenga Theodore Alan · SVP, Chief Account…Mar 2

1,632 sh @ $22.80 · -3.2% own

FTAX$3.5K

Huizenga Theodore Alan · SVP, Chief Account…Mar 2

148 sh @ $23.39 · -0.3% own

FTAX$23.4K

Huang Dennis Karl · See RemarksMar 2

999 sh @ $23.39 · -0.8% own

SSELL◷$70.3K

Horn Howard · Chief Financial…Mar 2

3,119 sh @ $22.54 · -3.5% own

SSELL◷$120.6K

Horn Howard · Chief Financial…Mar 2

5,290 sh @ $22.80 · -5.6% own

SSELL$240.3K

Harris Erik · EVP & Chief…Mar 2

10,539 sh @ $22.80 · -10.5% own

SSELL$160.3K

Crombez Eric · EVP and Chief…Mar 2

7,029 sh @ $22.80 · -8.4% own

AGRANT—

Pinion John Richard · See RemarksMar 1

11,137 sh · +10.3% own

AGRANT—

Parschauer Karah Herdman · EVP and Chief…Mar 1

11,137 sh · +15.2% own

AGRANT—

Kakkis Emil D · President & CEOMar 1

71,177 sh · +11.1% own

AGRANT—

Huang Dennis Karl · See RemarksMar 1

11,137 sh · +9.7% own

AGRANT◷—

Horn Howard · Chief Financial…Mar 1

6,143 sh · +6.9% own

AGRANT—

Harris Erik · EVP & Chief…Mar 1

11,643 sh · +13.3% own

AGRANT—

Crombez Eric · EVP and Chief…Mar 1

11,643 sh · +16.3% own

SSELL◷$72.1K

Horn Howard · Chief Financial…Feb 2

3,061 sh @ $23.56 · -3.3% own

SSELL◷$71.9K

Horn Howard · Chief Financial…Jan 2

3,150 sh @ $22.84 · -3.3% own

SSELL$2.9K

Huizenga Theodore Alan · SVP, Chief Account…Dec 29, 2025

85 sh @ $34.38 · -0.2% own

SSELL◷$112.1K

Horn Howard · Chief Financial…Dec 10, 2025

3,081 sh @ $36.38 · -3.1% own

SSELL$250.3K

Horn Howard · Chief Financial…Oct 13, 2025

7,942 sh @ $31.51 · -7.5% own

SSELL$1.9K

Huizenga Theodore Alan · SVP, Chief Account…Sep 18, 2025

64 sh @ $29.17 · -0.1% own

SSELL$76.4K

Parschauer Karah Herdman · EVP and Chief…Sep 12, 2025

2,450 sh @ $31.17 · -3.2% own

SSELL$2.6K

Huizenga Theodore Alan · SVP, Chief Account…Sep 5, 2025

84 sh @ $31.39 · -0.2% own

SSELL◷$89.9K

Sanders Corazon… · DirectorJun 20, 2025

2,405 sh @ $37.39 · -13.6% own

AGRANT◆—

Welch Daniel G · DirectorMay 15, 2025

10,787 sh

AGRANT—

Welch Daniel G · DirectorMay 15, 2025

5,740 sh · +21.3% own

AGRANT◆—

Sanders Corazon… · DirectorMay 15, 2025

10,787 sh

AGRANT—

Sanders Corazon… · DirectorMay 15, 2025

5,740 sh · +47.8% own

AGRANT◆—

Suliman Shehnaaz · DirectorMay 15, 2025

10,787 sh

AGRANT—

Suliman Shehnaaz · DirectorMay 15, 2025

5,740 sh · +28.4% own

AGRANT◆—

Ray Amrit · DirectorMay 15, 2025

10,787 sh

AGRANT—

Ray Amrit · DirectorMay 15, 2025

5,740 sh · +32.6% own

AGRANT◆—

Narachi Michael · DirectorMay 15, 2025

10,787 sh

AGRANT—

Narachi Michael · DirectorMay 15, 2025

5,740 sh · +21.3% own

AGRANT◆—

Fust Matthew K · DirectorMay 15, 2025

10,787 sh

AGRANT—

Fust Matthew K · DirectorMay 15, 2025

5,740 sh · +28.4% own

AGRANT◆—

Dunsire Deborah · DirectorMay 15, 2025

10,787 sh

AGRANT—

Dunsire Deborah · DirectorMay 15, 2025

5,740 sh · +22.9% own

SSELL$20.4K

Crombez Eric · EVP and Chief…May 5, 2025

520 sh @ $39.24 · -0.7% own

SSELL$8.5K

Crombez Eric · EVP and Chief…Apr 21, 2025

242 sh @ $35.11 · -0.3% own

Filing record

How quickly insiders here report their trades. Section 16 allows two business days from the transaction.

1 of 48 filings we hold was filed after the two-business-day deadline. The furthest past the deadline was 7 business days late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Insider	Past deadline	Largest line	Source
Apr 21, 2025	May 4, 2025	Crombez EricEVP and Chief Medical Officer	7days	$20.4K	Filing ↗

Crombez EricEVP and Chief Medical Officer

7days

Traded Apr 21, 2025 · filed May 4, 2025Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured · All late filings

Insiders at this company

Everyone who has filed a Form 4 for this issuer.

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