13F Insight
DOSSIER · 13F Holders · Q1 2026Inflation hedgeYield

Prothena Corp PLC

195 institutions still hold Prothena Corp PLC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP g72800108·195 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 1.5%
vs prior quarter
13F value held
$334M
52.0% inst. owned
of float
Holders
195
-59 QoQ
filers reporting
Activity
+81 / −23
+759 added · −732 reduced
this quarter
Concentration
21.95%
FMR LLC #1
top holder share
AI Holders Summary · Q1 2026

195 institutions reported Prothena Corp PLC in Q1 2026. FMR LLC leads at 21.9% of the visible book. -59 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
FMR LLC
CIK 0000315066
$73M7.6M0.00%Q1 202602
BlackRock, Inc.
CIK 0002012383
$45M4.6M0.00%Q1 202603
Rubric Capital Management LP
CIK 0001687509
$35M3.7M0.42%Q4 202504
STATE STREET CORP
CIK 0000093751
$19M1.9M0.00%Q1 202605
D. E. Shaw & Co., Inc.
CIK 0001009207
$16M1.7M0.01%Q4 202506
ADAR1 Capital Management, LLC
CIK 0001940272
$15M1.6M0.90%Q1 202607
Vanguard Portfolio Management
CIK 0002100121
$14M1.4M0.00%Q1 202608
MORGAN STANLEY
CIK 0000895421
$12M1.2M0.00%Q1 202609
Palo Alto Investors LP
CIK 0001306923
$12M1.2M1.80%Q1 202610
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$12M1.2M0.01%Q1 202611
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$11M1.1M0.00%Q1 202612
FEDERATED HERMES, INC.
CIK 0001056288
$10M1.1M0.02%Q1 202613
CITADEL ADVISORS LLC
CIK 0001423053
$10M1.1M0.00%Q4 202514
JACOBS LEVY EQUITY MANAGEMENT, INC
CIK 0000884414
$9M972K0.04%Q1 202615
GOLDMAN SACHS GROUP INC
CIK 0000886982
$8M819K0.00%Q1 202616
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$8M783K0.00%Q1 202617
Nuveen, LLC
CIK 0001871926
$7M759K0.00%Q1 202618
Qube Research & Technologies Ltd
CIK 0001729829
$6M615K0.01%Q1 202619
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$6M608K0.01%Q1 202620
Mariner, LLC
CIK 0001373442
$5M563K0.01%Q1 2026
Page 1 of 10
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