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Prothena Corp
PRTA

Overview Fund Activity

187 hedge funds and large institutions have $254M invested in Prothena Corp in 2025 Q2 according to their latest regulatory filings, with 52 funds opening new positions, 54 increasing their positions, 41 reducing their positions, and 22 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
187
Holders Change
+28
Holders Change %
+17.61%
% of All Funds
2.51%
Holding in Top 10
3
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.04%
New
52
Increased
54
Reduced
41
Closed
22
Calls
$6.7M
Puts
$6.34M
Net Calls
+$359K
Net Calls Change
-$1.89M

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 Holding Trade Value Shares
Change 		Shares
Change %
FWA
151
Flagship Wealth Advisors
Massachusetts
$9.11K +$9.11K +1,500 New
AB
152
Amalgamated Bank
New York
$9K – – –
GFM
153
GF Fund Management
China
$8.36K – – –
Carson Wealth (CWM LLC)
154
Carson Wealth (CWM LLC)
Nebraska
$8K +$4.28K +731 +115%
SS
155
SBI Securities
Japan
$5.84K – – –
SCM
156
Sterling Capital Management
North Carolina
$5.82K +$3.81K +628 +190%
IA
157
IFP Advisors
Florida
$5.54K -$1.63K -132 Closed
BNP Paribas Asset Management
158
BNP Paribas Asset Management
France
$4K +$4K +683 New
PA
159
Parallel Advisors
California
$3.6K +$3.18K +523 +747%
Nisa Investment Advisors
160
Nisa Investment Advisors
Missouri
$3.19K -$4.32K -711 -57%
PAS
161
Point72 Asia (Singapore)
Singapore
$2.79K +$2.79K +459 New
Osaic Holdings
162
Osaic Holdings
Arizona
$2.34K +$187 +14 +9%
AF
163
Allworth Financial
California
$2.26K +$1.97K +325 +691%
HNB
164
Huntington National Bank
Ohio
$1.97K +$1.97K +324 New
MCM
165
Manchester Capital Management
Vermont
$1.52K – – –
SWM
166
Spire Wealth Management
Virginia
$1.21K – – –
GI
167
GAMMA Investing
California
$1.2K -$1.75K -288 -59%
ADL
168
Asset Dedication LLC
California
$1.12K – – –
Daiwa Securities Group
169
Daiwa Securities Group
Japan
$1K – – –
NC
170
North Capital
Utah
$965 – – –
SN
171
Sittner & Nelson
Oregon
$941 – – –
MCM
172
MAI Capital Management
Ohio
$941 +$941 +155 New
AFG
173
Albion Financial Group
Utah
$759 – – –
HIA
174
Harbor Investment Advisory
Maryland
$607 – – –
GC
175
Gould Capital
Washington
$607 – – –
5 6
7
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