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Prothena Corp
PRTA
PRTA
181 hedge funds and large institutions have $452M invested in Prothena Corp in 2025 Q4 according to their latest regulatory filings, with 25 funds opening new positions, 62 increasing their positions, 57 reducing their positions, and 26 closing their positions.
New
Increased
Maintained
Reduced
Closed
8.64% more ownership
Funds ownership: 79.15% → 87.78% (+8.6%)
9% more capital invested
Capital invested by funds: $416M → $452M (+$35.8M)
9% more repeat investments, than reductions
Existing positions increased: 62 | Existing positions reduced: 57
4% less first-time investments, than exits
New positions opened: 25 | Existing positions closed: 26
3% less funds holding
Funds holding: 187 → 181 (-6)
16% less call options, than puts
Call options by funds: $6.74M | Put options by funds: $8.02M
50% less funds holding in top 10
Funds holding in top 10: 2 → 1 (-1)
Holders
181
Holders Change
-6
Holders Change %
-3.21%
% of All Funds
2.2%
Holding in Top 10
1
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-50%
% of All Funds
0.01%
New
25
Increased
62
Reduced
57
Closed
26
Calls
$6.74M
Puts
$8.02M
Net Calls
-$1.28M
Net Calls Change
+$6.27M
Top Buyers
| 1 |
RCMNY
Rubric Capital Management (New York)
New York
|
+$21.8M |
| 2 |
State Street
Boston,
Massachusetts
|
+$13.9M |
| 3 |
Goldman Sachs
New York
|
+$5.93M |
| 4 |
BlackRock
New York
|
+$5.18M |
| 5 |
Morgan Stanley
New York
|
+$4.55M |
Top Sellers
| 1 |
Millennium Management
New York
|
-$6.1M |
| 2 |
JP Morgan Chase
New York
|
-$5.76M |
| 3 |
AG
Algert Global
San Francisco,
California
|
-$4.35M |
| 4 |
Arrowstreet Capital
Boston,
Massachusetts
|
-$3.63M |
| 5 |
Fidelity Investments
Boston,
Massachusetts
|
-$3.56M |
