13F Insight
DOSSIER · 13F Holders · Q1 2026CyclicalNet sold
RARE

ULTRAGENYX PHARMACEUTICAL, INC

312 institutions still hold ULTRAGENYX PHARMACEUTICAL, INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 90400d108·312 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 5.0%
vs prior quarter
13F value held
$1.3B
51.0% inst. owned
of float
Holders
312
+75 QoQ
filers reporting
Activity
+23 / −25
+782 added · −668 reduced
this quarter
Concentration
11.96%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

312 institutions reported RARE in Q1 2026. BlackRock, Inc. leads at 12.0% of the visible book. +75 net new institutions vs prior quarter — accumulation reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$153M7.3M0.00%Q1 202602
Vanguard Portfolio Management
CIK 0002100121
$113M5.4M0.01%Q1 202603
STATE STREET CORP
CIK 0000093751
$105M5.0M0.00%Q1 202604
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
$96M4.6M0.04%Q1 202605
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$88M4.2M0.00%Q1 202606
RTW INVESTMENTS, LP
CIK 0001493215
$76M3.6M0.76%Q1 202607
Sofinnova Investments, Inc.
CIK 0001631134
$73M3.5M2.78%Q1 202608
SANDS CAPITAL MANAGEMENT, LLC
CIK 0001020066
$67M3.2M0.26%Q1 202609
BAKER BROS. ADVISORS LP
CIK 0001263508
$64M2.8M0.37%Q4 202510
CITADEL ADVISORS LLC
CIK 0001423053
$61M2.7M0.01%Q4 202511
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$55M2.6M0.01%Q1 202612
Assenagon Asset Management S.A.
CIK 0001546007
$47M2.3M0.07%Q1 202613
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$46M2.2M0.04%Q1 202614
FRONTIER CAPITAL MANAGEMENT CO LLC
CIK 0000351173
$46M2.2M0.47%Q1 202615
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$39M1.8M0.00%Q1 202616
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$37M1.8M0.02%Q1 202617
MORGAN STANLEY
CIK 0000895421
$31M1.5M0.00%Q1 202618
JACOBS LEVY EQUITY MANAGEMENT, INC
CIK 0000884414
$30M1.4M0.13%Q1 202619
Rock Springs Capital Management LP
CIK 0001595725
$26M1.2M1.50%Q1 202620
Jones Hill Capital LP
CIK 0002102314
$24M1.2M5.23%Q1 2026
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