$11.55
+0.76 (+7.04%)
Market Cap
$578.7M
Shares Outstanding
53,832,982
Institutional Holders
159
Total Inst. Value
$638.0M
% of Float Held
120.4%
QoQ Holder Change
+27
Institutional data as of Q1 2025
New Positions
22
Closed Positions
25
Increased
41
Decreased
57
Institutional Ownership Trend
Top 10 Institutional Holders(Q1 2025)
| # | Fund | Value | Shares |
|---|---|---|---|
| 1 | EcoR1 Capital, LLC | $143.4M | 11,584,280 |
| 2 | FMR LLC | $98.3M | 7,941,402 |
| 3 | WELLINGTON MANAGEMENT GROUP LLP | $64.3M | 5,199,528 |
| 4 | BlackRock, Inc. | $50.0M | 4,042,301 |
| 5 | PRICE T ROWE ASSOCIATES INC /MD/ | $42.8M | 3,455,856 |
| 6 | ARMISTICE CAPITAL, LLC | $27.2M | 2,196,000 |
| 7 | Palo Alto Investors LP | $20.5M | 1,659,734 |
| 8 | STATE STREET CORP | $18.8M | 1,521,364 |
| 9 | Siren, L.L.C. | $15.9M | 1,283,555 |
| 10 | VANGUARD GROUP INC | $15.7M | 1,269,271 |
Biggest Buyers & Sellers This Quarter
Top Buyers
| Fund | Shares Added | Value |
|---|---|---|
| WELLINGTON MANAGEMENT GROUP LLP | +69K | $64.3M |
| Siren, L.L.C. | +184K | $15.9M |
| GEODE CAPITAL MANAGEMENT, LLC | +50K | $12.6M |
| MORGAN STANLEY | +498 | $8.9M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | +144 | $4.7M |
Top Sellers
| Fund | Shares Removed | Value |
|---|---|---|
| STATE STREET CORP | -340K | $18.8M |
| PRICE T ROWE ASSOCIATES INC /MD/ | -230K | $42.8M |
| FEDERATED HERMES, INC. | -200K | $6.8M |
| Rock Springs Capital Management LP | -152K | $6.1M |
| VANGUARD GROUP INC | -135K | $15.7M |
Famous Fund Managers
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Frequently Asked Questions
How many institutional investors hold PRTA?
As of Q1 2025, 159 institutional investors report holding PRTA (Prothena Corporation plc) in their 13F filings.
What percentage of Prothena Corporation plc is owned by institutions?
Institutional investors hold approximately 120.4% of Prothena Corporation plc's float as reported in SEC 13F filings.
Which hedge fund owns the most PRTA?
The largest institutional holder of PRTA is EcoR1 Capital, LLC with $143.4M in shares.
Are institutions buying or selling PRTA?
This quarter, 22 institutions opened new positions in PRTA and 25 closed their positions.
What is 13F institutional ownership?
SEC Form 13F is a quarterly report filed by institutional investment managers with over $100M in qualifying assets. It discloses their US equity holdings, providing transparency into what the largest investors are buying and selling.
How often is institutional ownership data updated?
13F filings are due 45 days after each calendar quarter end (May 15, Aug 14, Nov 14, Feb 14). Data is updated on HedgeTrace as new filings are processed.