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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 %
Renaissance Technologies
51
Renaissance Technologies
New York
$548K 90,200 -149,700 -62%
DWAM
52
Duncan Williams Asset Management
Tennessee
$536K 88,339 – –
AllianceBernstein
53
AllianceBernstein
Tennessee
$532K 87,587 +40,834 +87%
HWAM
54
Hennion & Walsh Asset Management
New Jersey
$523K 86,154 +8,517 +11%
PA
55
Pinnacle Associates
New York
$450K 74,079 -26,180 -26%
SPS
56
Susquehanna Portfolio Strategies
Pennsylvania
$435K 71,668 +71,668 New
T. Rowe Price Associates
57
T. Rowe Price Associates
Maryland
$432K 71,047 -3,384,809 -98%
MAM
58
Monaco Asset Management
Monaco
$425K 70,000 +70,000 New
CM
59
Caption Management
Oklahoma
$395K 65,100 +65,100 New
RhumbLine Advisers
60
RhumbLine Advisers
Massachusetts
$382K 63,005 -3,074 -5%
UBS Group
61
UBS Group
Switzerland
$368K 60,664 -183,815 -75%
American Century Companies
62
American Century Companies
Missouri
$364K 59,965 +25,129 +72%
QCM
63
Quantinno Capital Management
New York
$362K 59,618 +59,618 New
ECM
64
ExodusPoint Capital Management
New York
$358K 58,918 +17,646 +43%
Norges Bank
65
Norges Bank
Norway
$349K 57,454 +57,454 New
Swiss National Bank
66
Swiss National Bank
Switzerland
$343K 56,500 -12,200 -18%
Franklin Resources
67
Franklin Resources
California
$340K 56,078 +36,331 +184%
SG Americas Securities
68
SG Americas Securities
New York
$315K 51,941 -20,618 -28%
Creative Planning
69
Creative Planning
Kansas
$307K 50,569 +39,879 +373%
QOP
70
Quinn Opportunity Partners
Virginia
$304K 50,000 +50,000 New
Citigroup
71
Citigroup
New York
$299K 49,303 -16,523 -25%
AG
72
Algert Global
California
$292K 48,150 +48,150 New
BNP Paribas Financial Markets
73
BNP Paribas Financial Markets
France
$284K 46,844 +37,267 +389%
HSBC Holdings
74
HSBC Holdings
United Kingdom
$282K 46,047 +32,959 +252%
Massachusetts Financial Services
75
Massachusetts Financial Services
Massachusetts
$269K 44,364 +548 +1%
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