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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 %
CFO
176
CVA Family Office
Colorado
$437 – – –
TC
177
Truvestments Capital
Florida
$418 +$6 +1 +1%
CIBC Private Wealth Group
178
CIBC Private Wealth Group
Georgia
$297 – – –
BTI
179
Blue Trust Inc
Georgia
$200 -$4.11K -678 -95%
CA
180
CoreCap Advisors
Michigan
$140 – – –
KFI
181
Key Financial Inc
Pennsylvania
$73 – – –
LWA
182
Lowe Wealth Advisors
Maryland
$61 – – –
SPIA
183
Steward Partners Investment Advisory
New York
$36 +$36 +6 New
CA
184
Clearstead Advisors
Ohio
$25 – – –
WTC
185
WhitTier Trust Company
Nevada
$18 – – –
CIAS
186
CBIZ Investment Advisory Services
Ohio
$12 – – –
KHC
187
Koesten Hirschmann & Crabtree
Kansas
$9 +$9 +1 New
HI
188
Harbour Investments
Wisconsin
$6 -$12 -2 -67%
EC
189
EcoR1 Capital
California
– -$143M -11,584,280 Closed
SL
190
Siren LLC
Connecticut
– -$15.9M -1,283,555 Closed
BCM
191
Boxer Capital Management
California
– -$8.54M -690,000 Closed
FC
192
Finepoint Capital
Massachusetts
– -$7.92M -640,071 Closed
TD Asset Management
193
TD Asset Management
Ontario, Canada
– -$776K -62,694 Closed
Rafferty Asset Management
194
Rafferty Asset Management
New York
– -$544K -43,978 Closed
CF
195
Corebridge Financial
Texas
– -$258K -20,831 Closed
HF
196
HRT Financial
New York
– -$173K -14,036 Closed
ProShare Advisors
197
ProShare Advisors
Maryland
– -$144K -11,632 Closed
Amundi
198
Amundi
France
– -$22.8K -2,014 Closed
EWA
199
EverSource Wealth Advisors
Alabama
– -$3.76K -304 Closed
SW
200
SVB Wealth
Massachusetts
– -$3.39K -274 Closed
5 6 7
8
9