Prothena Corp
PRTA
186 hedge funds and large institutions have $2.56B invested in Prothena Corp in 2023 Q3 according to their latest regulatory filings, with 25 funds opening new positions, 73 increasing their positions, 51 reducing their positions, and 32 closing their positions.
43% more repeat investments, than reductions
Existing positions increased: 73 | Existing positions reduced: 51
0.45% more ownership
Funds ownership: 98.49% → 98.94% (+0.45%)
5% less funds holding
Funds holding: 196 → 186 (-10)
17% less funds holding in top 10
Funds holding in top 10: 6 → 5 (-1)
22% less first-time investments, than exits
New positions opened: 25 | Existing positions closed: 32
28% less capital invested
Capital invested by funds: $3.54B → $2.56B (-$987M)
47% less call options, than puts
Call options by funds: $9.61M | Put options by funds: $18.1M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BC
Boxer Capital
San Diego,
California
|
+$19.3M |
| 2 |
T. Rowe Price Associates
Baltimore,
Maryland
|
+$15.8M |
| 3 |
State Street
Boston,
Massachusetts
|
+$14.1M |
| 4 |
Millennium Management
New York
|
+$13.8M |
| 5 |
Janus Henderson Group
London,
United Kingdom
|
+$9.15M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Man Group
London,
United Kingdom
|
-$10.1M |
| 2 |
APM
Avidity Partners Management
Dallas,
Texas
|
-$9.07M |
| 3 |
RSCM
Rock Springs Capital Management
Baltimore,
Maryland
|
-$8.27M |
| 4 |
ACM
Atika Capital Management
New York
|
-$6.66M |
| 5 |
EGI
EAM Global Investors
Solana Beach,
California
|
-$4.84M |
PRTA Hedge Fund Activity: Q3 2023 in Review
186 of the 6,301 institutional investors tracked by Wall St. Rank reported a position in Prothena Corp (PRTA) for Q3 2023, worth a combined $2.56B — down 28% from $3.54B a quarter earlier.
Sellers outnumbered buyers: 32 funds closed out of PRTA and 25 opened new positions — a net loss of 7 holders — while 51 trimmed existing stakes and 73 added.
The largest buyer was Boxer Capital, adding an estimated $19.3M. The largest seller was Man Group, exiting entirely with an estimated $10.1M sold.
- 186 institutional investors held Prothena Corp (PRTA) as of Q3 2023, down from 196 in Q2 2023.
- Funds reported $2.56B of Prothena Corp stock for Q3 2023, down 28% quarter-over-quarter.
- 25 funds opened new Prothena Corp positions in Q3 2023 and 32 closed out, a net change of -7 holders.
- The largest Prothena Corp buyer in Q3 2023 was Boxer Capital, an estimated $19.3M added.
- The largest Prothena Corp seller in Q3 2023 was Man Group, an estimated $10.1M sold.
Based on aggregated 13F filings for Q3 2023.