PROTHENA CORP PLC (PRTA) is held by 99 institutional investors that disclose positions via SEC 13F filings. The largest disclosed holder is FMR LLC as of Q1 2026.

Are institutions buying or selling PRTA?

In Q1 2026, 55 institutions opened or increased positions in PROTHENA CORP PLC while 41 reduced or exited — a net buying quarter.

What is the Smart Money Verdict on PRTA?

The Smart Money Verdict combines four independent sources (institutional 13F activity, insider trades, activist filings, and congressional trades) into a single assessment for PROTHENA CORP PLC.

How many hedge funds hold PRTA?

99 institutional investors report holding PROTHENA CORP PLC (PRTA) as of Q1 2026, based on SEC 13F filings.

Is institutional money flowing into PRTA?

As of Q1 2026, tracked institutions in PROTHENA CORP PLC show 55 buyers versus 41 sellers — net inflows.

PROTHENA CORP PLC

PRTA·G72800108·US·Common Stock·Healthcare - Biotechnology-Activist

Holders

Avg rating(24 Elite)

$329.6M

Total Value

57% (107)

Fund Consensus

55 buying - 41 selling

Smart Money Verdict

View all

Held by 99 funds

24 elite

Who's Trading

InsiderSPSCULLY WILLIAM PBuy $158KJun 16, 2026

InsiderSPSCULLY WILLIAM PBuy $465KJun 4, 2026

InsiderSPSCULLY WILLIAM PBuy $981KMay 22, 2026

ActivistRURubric Capital Management LP9.3%May 15, 2026

ActivistSWSCULLY WILLIAM P10.3%May 11, 2026

ActivistADADAR1 Capital Management, LLC2.7%Nov 14, 2025

ActivistFTFennell Todd W.8.4%Nov 12, 2025

Activist

BlackRock, Inc.5.7%Oct 17, 2025

Activist

T. Rowe Price Associates, Inc.0.1%Aug 14, 2025

InsiderSPSCULLY WILLIAM PBuy $1.3MJan 14, 2025

View all insider trades View all activist filings

13F: Mar 31, 2026Insider & Congress: Updated regularly

Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
FMR LLC	Unchanged	7.6M	$73.4M	0.0%	-37.90%	0
BlackRock, Inc.	Increased	4.6M(+13.1%)	$45.1M	0.0%	-32.22%	33
STATE STREET CORP	Decreased	1.9M(-14.5%)	$18.8M	0.0%	-49.63%	0
DED. E. Shaw & Co., Inc.	Increased	1.8M(+4.9%)	$17.1M	0.0%	+3.79%	30
VPVANGUARD PORTFOLIO MANAGEMENT LLC	New	1.4M	$14.1M	0.0%	-1.28%	39
MORGAN STANLEY	Decreased	1.2M(-1.3%)	$12M	0.0%	-35.33%	0
TWO SIGMA INVESTMENTS, LP	Increased	1.2M(+80.0%)	$11.7M	0.0%	+2.50%	43
GEODE CAPITAL MANAGEMENT, LLC	Increased	1.1M(+3.3%)	$10.7M	0.0%	-65.59%	29
FEDERATED HERMES, INC.	Increased	1.1M(+8.8%)	$10.3M	0.0%	-13.82%	30
JACOBS LEVY EQUITY MANAGEMENT, INC	Decreased	972,017(-0.6%)	$9.4M	0.0%	+27.64%	0
GOLDMAN SACHS GROUP INC	Decreased	818,885(-12.4%)	$8M	0.0%	-18.24%	0
DIMENSIONAL FUND ADVISORS LP	Increased	782,603(+0.9%)	$7.6M	0.0%	-78.36%	28
Nuveen, LLC	Increased	759,368(+0.0%)	$7.4M	0.0%	-9.85%	27
Qube Research & Technologies Ltd	Increased	614,603(+50.8%)	$6M	0.0%	+15.63%	38
RENAISSANCE TECHNOLOGIES LLC	Increased	607,515(+39.5%)	$5.9M	0.0%	-20.96%	36
Mariner, LLC	Decreased	563,082(-2.6%)	$5.5M	0.0%	-62.37%	0
VAVANGUARD CAPITAL MANAGEMENT LLC	New	484,126	$4.7M	0.0%	-1.28%	37
CITADEL ADVISORS LLC	Decreased	435,574(-52.3%)	$4.2M	0.0%	+20.82%	0
BNP PARIBAS FINANCIAL MARKETS	Increased	424,596(+0.1%)	$4.1M	0.0%	-4.03%	27
Point72 Asset Management, L.P.	Decreased	399,830(-53.5%)	$3.9M	0.0%	-4.23%	0