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Prothena Corp
PRTA

Overview Fund Activity

185 hedge funds and large institutions have $253M invested in Prothena Corp in 2025 Q2 according to their latest regulatory filings, with 52 funds opening new positions, 53 increasing their positions, 41 reducing their positions, and 22 closing their positions.

Holders
185
Holders Change
+26
Holders Change %
+16.35%
% of All Funds
2.48%
Holding in Top 10
3
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.04%
New
52
Increased
53
Reduced
41
Closed
22
Calls
$4.37M
Puts
$3.43M
Net Calls
+$940K
Net Calls Change
-$1.31M

Top Buyers

1
ACM
1
ADAR1 Capital Management
Texas
$20.5M
2
Citadel Advisors
2
Citadel Advisors
Florida
$6.97M
3
Acadian Asset Management
3
Acadian Asset Management
Massachusetts
$6.18M
4
Vanguard Group
4
Vanguard Group
Pennsylvania
$13.2M
5
RC
5
Rangeley Capital
Connecticut
$4.34M

Top Sellers

1
EC
1
EcoR1 Capital
California
$0
2
Wellington Management Group
2
Wellington Management Group
Massachusetts
$655K
3
T. Rowe Price Associates
3
T. Rowe Price Associates
Maryland
$432K
4
SL
4
Siren LLC
Connecticut
$0
5
BCM
5
Boxer Capital Management
California
$0
Name Market Value Shares Shares
Change 		Shares
Change %
Northern Trust
26
Northern Trust
Illinois
$2.03M 334,554 -39,149 -10%
Nordea Investment Management
27
Nordea Investment Management
Sweden
$1.92M 311,605 +3,618 +1%
SSA
28
Schonfeld Strategic Advisors
New York
$1.87M 307,341 +307,341 New
Charles Schwab
29
Charles Schwab
California
$1.67M 275,084 -44,523 -14%
PM
30
Prosight Management
Texas
$1.63M 267,800 -140,322 -34%
Bank of America
31
Bank of America
North Carolina
$1.28M 210,945 +78,959 +60%
GCP
32
GSA Capital Partners
United Kingdom
$1.28M 210,555 +210,555 New
Squarepoint
33
Squarepoint
New York
$1.27M 209,249 +209,249 New
MCM
34
Monimus Capital Management
New Jersey
$1.25M 206,475 +206,475 New
Two Sigma Investments
35
Two Sigma Investments
New York
$1.22M 201,450 +185,417 +1,156%
Millennium Management
36
Millennium Management
New York
$1.04M 170,579 +118,112 +225%
DA
37
DCF Advisers
Connecticut
$950K 156,500 -38,500 -20%
Ameriprise
38
Ameriprise
Minnesota
$920K 151,543 +151,543 New
Bank of New York Mellon
39
Bank of New York Mellon
New York
$900K 148,350 +2,341 +2%
Two Sigma Advisers
40
Two Sigma Advisers
New York
$849K 139,800 +139,800 New
UBS AM
41
UBS AM
Illinois
$845K 139,284 -242,368 -64%
JPMorgan Chase & Co
42
JPMorgan Chase & Co
New York
$771K 126,951 -245,014 -66%
NL
43
Nuveen LLC
North Carolina
$741K 122,155 -27,806 -19%
Jane Street
44
Jane Street
New York
$713K 117,453 -15,187 -11%
Barclays
45
Barclays
United Kingdom
$704K 115,848 +32,467 +39%
Wellington Management Group
46
Wellington Management Group
Massachusetts
$655K 107,839 -5,091,689 -98%
Royal Bank of Canada
47
Royal Bank of Canada
Ontario, Canada
$643K 105,939 +101,621 +2,353%
State of Wisconsin Investment Board
48
State of Wisconsin Investment Board
Wisconsin
$631K 103,996 +103,996 New
Russell Investments Group
49
Russell Investments Group
United Kingdom
$584K 96,196 +95,002 +7,957%
Susquehanna International Group
50
Susquehanna International Group
Pennsylvania
$558K 91,950 +14,707 +19%
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