Who Owns Prothena Corporation plc (PRTA)?Hedge Fund & Institutional Holders

$9.26-0.05 (-0.54%)HealthcareNASDAQ

Institutional Holders

50

as of Q4 2025

Total Institutional Value

$3.9000351183200022e+202T

% of Float Held

Infinity%

QoQ Change in Holders

+13 / -0

Price History

$4.58$8.94$13.30$17.66$22.02Sep 24Jun 25Mar 26

PRTA — Biggest New Institutional Buyers This Quarter

FundActionShares AddedValue Added
FEDERATED HERMES, INC.New Position+974K+$8.0M
DIADEMA PARTNERS LPNew Position+107K+$1.0M
Connor, Clark & Lunn Investment Management Ltd.New Position+126K+$1.0M
ACADIAN ASSET MANAGEMENT LLCIncreased+198K+$910K
Hennion & Walsh Asset Management, Inc.New Position+91K+$871K
SG Americas Securities, LLCNew Position+63K+$602K
MASSACHUSETTS FINANCIAL SERVICES CO /MA/New Position+46K+$438K
Walleye Capital LLCIncreased+156K+$385K
DekaBank Deutsche GirozentraleNew Position+14K+$383K
Persistent Asset Partners LtdNew Position+29K+$273K
Purkiss Capital Advisors LLCNew Position+25K+$239K
Covestor LtdNew Position+22K+$208K
MOGY JOEL R INVESTMENT COUNSEL INCNew Position+21K+$198K
Ballentine Partners, LLCNew Position+18K+$172K
STRS OHIONew Position+18K+$168K

PRTA — Institutions Reducing or Closing Positions

FundActionShares SoldValue Sold
FMR LLCDecreased-350K-$77.0B
ARMISTICE CAPITAL, LLCDecreased-324K-$17.8B
ADAR1 Capital Management, LLCDecreased-11K-$14.3B
Palo Alto Investors LPDecreased-4K-$12.9B
DIMENSIONAL FUND ADVISORS LPDecreased-32K-$7.9B
JPMORGAN CHASE & CODecreased-566K-$7.2B
ARROWSTREET CAPITAL, LIMITED PARTNERSHIPDecreased-356K-$6.4B
MILLENNIUM MANAGEMENT LLCDecreased-599K-$6.1B
JANE STREET GROUP, LLCDecreased-191K-$6.0B
Mariner, LLCDecreased-13K-$5.8B
Rangeley Capital, LLCDecreased-36K-$5.5B
Birchview Capital, LPDecreased-108K-$5.4B
Trexquant Investment LPDecreased-260K-$2.7B
MONIMUS CAPITAL MANAGEMENT, LPDecreased-4K-$2.5B
AQR CAPITAL MANAGEMENT LLCDecreased-28K-$2.1B

Top Institutional Holders(Q4 2025)

#FundSharesValue% of PortfolioType
1FMR LLC4,131,932$39.0M0.00%Share
2Rubric Capital Management LP3,677,331$35.1M0.42%Share
3FMR LLC3,419,286$32.0M0.00%Share
4STATE STREET CORP2,267,802$21.0M0.00%Share
5VANGUARD GROUP INC1,881,735$18.0M0.00%Share
6BlackRock, Inc.1,882,205$17.0M0.00%Share
7D. E. Shaw & Co., Inc.1,681,369$16.0M0.01%Share
8ARMISTICE CAPITAL, LLC1,500,000$14.3M0.17%Share
9ADAR1 Capital Management, LLC1,457,764$13.9M1.01%Share
10ACADIAN ASSET MANAGEMENT LLC1,437,358$13.0M0.02%Share
11BlackRock, Inc.1,443,752$13.0M0.00%Share
12Palo Alto Investors LP1,320,510$12.6M1.76%Share
13JACOBS LEVY EQUITY MANAGEMENT, INC978,011$9.0M0.03%Share
14GEODE CAPITAL MANAGEMENT, LLC919,039$8.0M0.00%Share
15Point72 Asset Management, L.P.860,018$8.0M0.01%Share
16GOLDMAN SACHS GROUP INC840,229$8.0M0.00%Share
17FEDERATED HERMES, INC.933,582$8.0M0.01%Share
18DIMENSIONAL FUND ADVISORS LP744,446$7.0M0.00%Share
19Nuveen, LLC755,382$7.0M0.00%Share
20TWO SIGMA INVESTMENTS, LP670,138$6.0M0.01%Share
21Rangeley Capital, LLC524,600$5.0M4.16%Share
22CITADEL ADVISORS LLC551,314$5.0M0.00%Share
23Mariner, LLC577,938$5.0M0.01%Share
24MORGAN STANLEY544,234$5.0M0.00%Share
25Birchview Capital, LP441,019$4.2M2.47%Share
26UBS Group AG425,304$4.1M0.00%Share
27TWO SIGMA ADVISERS, LP427,400$4.0M0.01%Share
28RENAISSANCE TECHNOLOGIES LLC435,515$4.0M0.01%Share
29BNP PARIBAS FINANCIAL MARKETS423,955$4.0M0.00%Share
30MORGAN STANLEY462,687$4.0M0.00%Share
31Qube Research & Technologies Ltd407,689$3.0M0.00%Share
32BANK OF AMERICA CORP /DE/404,861$3.0M0.00%Share
33NORTHERN TRUST CORP353,707$3.0M0.00%Share
34CITADEL ADVISORS LLC361,068$3.0M0.00%Share
35CHARLES SCHWAB INVESTMENT MANAGEMENT INC357,335$3.0M0.00%Share
36MONIMUS CAPITAL MANAGEMENT, LP254,122$2.4M1.60%Share
37VANGUARD GROUP INC240,925$2.3M0.00%Share
38Squarepoint Ops LLC218,041$2.0M0.00%Share
39Jump Financial, LLC236,400$2.0M0.02%Share
40SUSQUEHANNA INTERNATIONAL GROUP, LLP312,500$2.0M0.00%Put
41JANE STREET GROUP, LLC245,119$2.0M0.00%Share
42Man Group plc269,513$2.0M0.00%Share
43SUSQUEHANNA INTERNATIONAL GROUP, LLP236,800$2.0M0.00%Call
44ARROWSTREET CAPITAL, LIMITED PARTNERSHIP298,101$2.0M0.00%Share
45BlackRock, Inc.273,701$2.0M0.00%Share
46DCF Advisers, LLC195,747$1.9M0.50%Share
47Focused Wealth Management, Inc107,479$1.0M0.11%Share
48DIADEMA PARTNERS LP106,539$1.0M0.18%Share
49BARCLAYS PLC183,599$1.0M0.00%Share
50GEODE CAPITAL MANAGEMENT, LLC144,030$1.0M0.00%Share

PRTA Institutional Ownership History

QuarterHoldersTotal ValueChange
Q4 2025179$405.6M+33
Q3 2025146$382.3B-17
Q2 2025163$209.8B+4
Q1 2025159$599.7B-3
Q4 2024162$1.6T+28
Q3 2024134$684.4T+0
Q2 2024134$717.0T+1
Q1 2024133$900.0T—

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As of Q4 2025, 50 institutional investors hold PRTA (Prothena Corporation plc). The largest holder is FMR LLC with $39.0M in shares. This quarter, 13 institutions opened new positions and 0 closed their positions.

Frequently Asked Questions

How many hedge funds own PRTA?

As of Q4 2025, 50 institutional investors report holding PRTA (Prothena Corporation plc) in their 13F filings.

Who is the largest institutional holder of PRTA?

The largest institutional holder of PRTA is FMR LLC with $39.0M in shares.

Is institutional ownership of PRTA increasing or decreasing?

This quarter, 13 institutions opened new positions in PRTA and 0 closed their positions.