SEC Form 4 · Updated Daily

RARE

— ULTRAGENYX PHARMACEUTICAL INC. Ownership

Insider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.

FinancialsOwnership

Current Reporting Owners

OwnerRoleShares OwnedAs OfLast Activity
KAKKIS EMIL DDirector · Officer735,7392026-04-16A
Huang Dennis KarlOfficer147,8452026-04-16A
Pinion John RichardOfficer133,1422026-04-16A
Harris ErikOfficer118,4102026-04-16A
Crombez EricOfficer111,1892026-05-05S
Horn HowardOfficer96,2952026-08-03S
Parschauer Karah HerdmanDirector92,5622026-08-03S
Huizenga Theodore AlanOfficer69,1462026-09-03S
WELCH DANIEL GDirector40,4412026-05-14A
NARACHI MICHAELDirector40,4412026-05-14A
Dunsire DeborahDirector38,5662026-05-14A
Fust Matthew KDirector33,6962026-05-14A
Ray AmritDirector31,1162026-05-14A
SULIMAN SHEHNAAZDirector27,9512026-05-18S
Sanders Corazon (Corsee) D.Director21,0952026-06-15S

Recent Filings

DateOwnerActivitySharesPriceOwned After
2026-09-03Huizenga Theodore AlanOpen-market sale161$13.9969,146
2026-08-03Horn HowardOpen-market sale4,696$24.9296,295
2026-08-03Parschauer Karah HerdmanOpen-market sale1,900$24.9292,562
2026-07-01Horn HowardOpen-market sale4,698$33.13100,991
2026-06-15Parschauer Karah HerdmanOpen-market sale1,899$24.6294,462
2026-06-15Sanders Corazon (Corsee) D.Open-market sale2,000$25.0521,095
2026-06-01Horn HowardOpen-market sale4,653$23.77105,689
2026-05-18SULIMAN SHEHNAAZOpen-market sale5,740$25.1227,951
2026-05-14Dunsire DeborahGrant / award (derivative)14,058$0.0014,058
2026-05-14Dunsire DeborahGrant / award7,751$0.0038,566
2026-05-14WELCH DANIEL GGrant / award (derivative)14,058$0.0014,058
2026-05-14WELCH DANIEL GGrant / award7,751$0.0040,441
2026-05-14NARACHI MICHAELGrant / award (derivative)14,058$0.0014,058
2026-05-14NARACHI MICHAELGrant / award7,751$0.0040,441
2026-05-14Sanders Corazon (Corsee) D.Grant / award (derivative)14,058$0.0014,058
2026-05-14Sanders Corazon (Corsee) D.Grant / award7,751$0.0023,095
2026-05-14Ray AmritGrant / award (derivative)14,058$0.0014,058
2026-05-14Ray AmritGrant / award7,751$0.0031,116
2026-05-14SULIMAN SHEHNAAZGrant / award (derivative)14,058$0.0014,058
2026-05-14SULIMAN SHEHNAAZGrant / award7,751$0.0033,691
2026-05-14Fust Matthew KGrant / award (derivative)14,058$0.0014,058
2026-05-14Fust Matthew KGrant / award7,751$0.0033,696
2026-05-05Crombez EricOpen-market sale344$24.96111,189
2026-05-01Horn HowardOpen-market sale4,683$24.90110,342
2026-04-22Huizenga Theodore AlanGrant / award (derivative)7,348$0.007,348
2026-04-22Huizenga Theodore AlanGrant / award20,241$0.0068,911
2026-04-16Horn HowardGrant / award (derivative)59,952$0.0059,952
2026-04-16Horn HowardGrant / award34,674$0.00115,025
2026-04-16Crombez EricGrant / award (derivative)59,952$0.0059,952
2026-04-16Crombez EricGrant / award34,674$0.00110,975
2026-04-16Harris ErikGrant / award (derivative)49,960$0.0049,960
2026-04-16Harris ErikGrant / award28,895$0.00118,410
2026-04-16Parschauer Karah HerdmanGrant / award (derivative)49,960$0.0049,960
2026-04-16Parschauer Karah HerdmanGrant / award28,895$0.0095,715
2026-04-16Pinion John RichardGrant / award (derivative)79,936$0.0079,936
2026-04-16Pinion John RichardGrant / award23,116$0.00133,142
2026-04-16Huang Dennis KarlGrant / award (derivative)79,936$0.0079,936
2026-04-16Huang Dennis KarlGrant / award23,116$0.00147,845
2026-04-16KAKKIS EMIL DGrant / award (derivative)132,693$0.00132,693
2026-04-16KAKKIS EMIL DGrant / award76,745$0.00735,739

Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.