Howard Horn

CIK: 0001786335

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)15 (83.3%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)3 (16.7%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

RARE

Ultragenyx Pharmaceutical Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (18 total)

RARE
Ultragenyx Pharmaceutical Inc.
Oct 15, 2026
Sale(S)
Direct
7.1K shares at avg. $15.27$108K
RARE
Ultragenyx Pharmaceutical Inc.
Aug 3, 2026
Sale(S)
Direct
4.7K shares at avg. $24.92$117K
RARE
Ultragenyx Pharmaceutical Inc.
Jul 1, 2026
Sale(S)
Direct
4.7K shares at avg. $33.13$156K
RARE
Ultragenyx Pharmaceutical Inc.
Jun 1, 2026
Sale(S)
Direct
4.7K shares at avg. $23.77$111K
RARE
Ultragenyx Pharmaceutical Inc.
May 1, 2026
Sale(S)
Direct
4.7K shares at avg. $24.90$117K
RARE
Ultragenyx Pharmaceutical Inc.
Apr 16, 2026
Award(A)
Direct
34.7K shares-
RARE
Ultragenyx Pharmaceutical Inc.
Apr 1, 2026
Sale(S)
Direct
4.7K shares at avg. $20.97$98K
RARE
Ultragenyx Pharmaceutical Inc.
Mar 3, 2026
Sale(S)
Direct
1.6K shares at avg. $22.40$37K
RARE
Ultragenyx Pharmaceutical Inc.
Mar 2, 2026
Sale(S)
Direct
3.1K shares at avg. $22.54$70K
RARE
Ultragenyx Pharmaceutical Inc.
Mar 2, 2026
Sale(S)
Direct
5.3K shares at avg. $22.80$121K
RARE
Ultragenyx Pharmaceutical Inc.
Mar 1, 2026
Award(A)
Direct
6.1K shares-
RARE
Ultragenyx Pharmaceutical Inc.
Feb 2, 2026
Sale(S)
Direct
3.1K shares at avg. $23.56$72K
RARE
Ultragenyx Pharmaceutical Inc.
Jan 2, 2026
Sale(S)
Direct
3.2K shares at avg. $22.84$72K
RARE
Ultragenyx Pharmaceutical Inc.
Dec 10, 2025
Sale(S)
Direct
3.1K shares at avg. $36.38$112K
RARE
Ultragenyx Pharmaceutical Inc.
Oct 13, 2025
Sale(S)
Direct
7.9K shares at avg. $31.51$250K
RARE
Ultragenyx Pharmaceutical Inc.
Mar 6, 2025
Sale(S)
Direct
1.8K shares at avg. $40.40$72K
RARE
Ultragenyx Pharmaceutical Inc.
Mar 1, 2025
Award(A)
Direct
15.7K shares-
RARE
Ultragenyx Pharmaceutical Inc.
Oct 10, 2024
Sale(S)
Direct
7.5K shares at avg. $52.76$394K

		Type	Shares	Price		Ownership
Oct 15, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	7,066	$15.27	$107,898	Direct
Aug 3, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	4,696	$24.92	$117,024	Direct
Jul 1, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	4,698	$33.13	$155,645	Direct
Jun 1, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	4,653	$23.77	$110,602	Direct
May 1, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	4,683	$24.90	$116,607	Direct
Apr 16, 2026	RARE Ultragenyx Pharmaceutical Inc.	Award(A)	34,674	-	$0	Direct
Apr 1, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	4,683	$20.97	$98,203	Direct
Mar 3, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	1,635	$22.40	$36,624	Direct
Mar 2, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	3,119	$22.54	$70,302	Direct
Mar 2, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	5,290	$22.80	$120,612	Direct
Mar 1, 2026	RARE Ultragenyx Pharmaceutical Inc.	Award(A)	6,143	-	$0	Direct
Feb 2, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	3,061	$23.56	$72,117	Direct
Jan 2, 2026	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	3,150	$22.84	$71,946	Direct
Dec 10, 2025	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	3,081	$36.38	$112,087	Direct
Oct 13, 2025	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	7,942	$31.51	$250,252	Direct
Mar 6, 2025	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	1,785	$40.40	$72,114	Direct
Mar 1, 2025	RARE Ultragenyx Pharmaceutical Inc.	Award(A)	15,653	-	-	Direct
Oct 10, 2024	RARE Ultragenyx Pharmaceutical Inc.	Sale(S)	7,465	$52.76	$393,853	Direct

1-18 of 18 transactions

About Horn Howard

Horn Howard (SEC CIK 0001786335) files insider reports with the SEC as Chief Financial Officer of Ultragenyx Pharmaceutical Inc. (RARE).

Signal8 holds 15 ownership filings by Horn Howard, all Form 4s, filed between Oct 11, 2024 and Oct 19, 2026. Those filings report 18 transactions, from Oct 10, 2024 to Oct 15, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Horn Howard's filings is in NOVATO, CA.

Recent filings by Horn Howard

Oct 15, 2026: Open-market sale of RARE shares (Form 4, code S).
Aug 3, 2026: Open-market sale of RARE shares (Form 4, code S).
Jul 1, 2026: Open-market sale of RARE shares (Form 4, code S).
Jun 1, 2026: Open-market sale of RARE shares (Form 4, code S).
May 1, 2026: Open-market sale of RARE shares (Form 4, code S).

Other insiders filing for Ultragenyx Pharmaceutical Inc. (RARE)

Huizenga Theodore Alan, SVP, Chief Accounting Officer
Parschauer Karah Herdman, EVP and Chief Legal Officer
Sanders Corazon (Corsee) D., Director
Fust Matthew K, Director
SULIMAN SHEHNAAZ, Director
Ray Amrit, Director

How to read Form 4 transaction codes