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Prothena Corp
PRTA
PRTA
185 hedge funds and large institutions have $457M invested in Prothena Corp in 2026 Q1 according to their latest regulatory filings, with 29 funds opening new positions, 68 increasing their positions, 50 reducing their positions, and 22 closing their positions.
New
Increased
Maintained
Reduced
Closed
100% more funds holding in top 10
Funds holding in top 10: 1 → 2 (+1)
45% more call options, than puts
Call options by funds: $3.61M | Put options by funds: $2.48M
36% more repeat investments, than reductions
Existing positions increased: 68 | Existing positions reduced: 50
32% more first-time investments, than exits
New positions opened: 29 | Existing positions closed: 22
2% more funds holding
Funds holding: 181 → 185 (+4)
1% more capital invested
Capital invested by funds: $452M → $457M (+$5.06M)
0.51% less ownership
Funds ownership: 87.78% → 87.27% (-0.51%)
Holders
185
Holders Change
+4
Holders Change %
+2.21%
% of All Funds
2.28%
Holding in Top 10
2
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+100%
% of All Funds
0.02%
New
29
Increased
68
Reduced
50
Closed
22
Calls
$3.61M
Puts
$2.48M
Net Calls
+$1.13M
Net Calls Change
+$2.41M
Top Buyers
| 1 |
RCMNY
Rubric Capital Management (New York)
New York
|
+$12.1M |
| 2 |
BlackRock
New York
|
+$4.92M |
| 3 |
Two Sigma Investments
New York
|
+$4.91M |
| 4 |
PM
Penbrook Management
New York
|
+$2.49M |
| 5 |
MCM
Monimus Capital Management
Woodbridge,
New Jersey
|
+$2.12M |
Top Sellers
| 1 |
AC
Armistice Capital
New York
|
-$9.72M |
| 2 |
Citadel Advisors
Miami,
Florida
|
-$4.37M |
| 3 |
Point72 Asset Management
Stamford,
Connecticut
|
-$4.22M |
| 4 |
State Street
Boston,
Massachusetts
|
-$3.02M |
| 5 |
Jane Street
New York
|
-$2.94M |
| Name | Holding | Trade Value |
Shares Change |
Change in Stake |
|
|---|---|---|---|---|---|
201
ProShare Advisors
Bethesda,
Maryland
| – | -$99.6K | -10,425 | Closed |
|
202
Canada Pension Plan Investment Board
Toronto Ontario,
Ontario, Canada
| – | -$67.8K | -7,100 | Closed |
|
|
FWA
203
Flagship Wealth Advisors
Wakefield,
Massachusetts
| – | -$14.3K | -1,500 | Closed |
|
|
AB
204
Amalgamated Bank
New York
| – | -$13K | -1,383 | Closed |
|
|
TM
205
Torren Management
San Diego,
California
| – | -$8.44K | -884 | Closed |
|
206
Daiwa Securities Group
Tokyo,
Japan
| – | -$2K | -195 | Closed |
|