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Prothena Corp (PRTA)
NASDAQ
$8.86-$0.33 (-3.58%)
Price as of Jun 03, 2026 4:22 PM EDT- $533.0MMarket Cap
- 90.27%1-Year Change
- BiotechnologyIndustry
Prothena Corp (PRTA)
$8.86-$0.33 (-3.58%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
FMR LLC | 14.42% | 7.6M | 0 (0.00%) | Mar 31, 2026 |
RUBRIC CAPITAL MANAGEMENT LP | 9.55% | 5.0M | +1.3M (+26.45%) | Mar 31, 2026 |
BLACKROCK, INC. | 8.87% | 4.6M | +536,701 (+11.56%) | Mar 31, 2026 |
BLACKROCK FUNDING, INC. /DE | 7.87% | 4.1M | +93,989 (+2.28%) | Dec 31, 2024 |
BLACKROCK INC. | 7.37% | 3.9M | +138,266 (+3.58%) | Jun 30, 2024 |
VANGUARD GROUP INC | 4.09% | 2.1M | +91,060 (+4.25%) | Dec 31, 2025 |
STATE STREET CORP | 3.70% | 1.9M | -329,304 (-16.99%) | Mar 31, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD SPECIALIZED FUNDS | 7.99% | 4.2M | 0 (0.00%) | Jan 31, 2026 |
FIDELITY MT VERNON STREET TRUST | 7.49% | 3.9M | 0 (0.00%) | Feb 28, 2026 |
SPDR SERIES TRUST | 3.54% | 1.9M | 0 (0.00%) | Jan 31, 2026 |
T. Rowe Price New Horizons Fund, Inc. | 3.37% | 1.8M | 0 (0.00%) | Mar 31, 2026 |
FIDELITY SELECT PORTFOLIOS | 1.68% | 877,217 | 0 (0.00%) | Feb 28, 2026 |
T. Rowe Price Health Sciences Fund, Inc. | 1.62% | 847,697 | 0 (0.00%) | Mar 31, 2026 |
DFA INVESTMENT DIMENSIONS GROUP INC | 1.56% | 815,875 | 0 (0.00%) | Jan 31, 2026 |
Current Ownership Distribution
- Institutions896.6M (83.40%)
- Mutual Funds166.3M (15.47%)
- Insiders12.1M (1.13%)
- Other0 (0.00%)
Insider Transactions
- 1.13% (12.1M)Current InsiderOwnership (%, shares)
- 1Number of InsiderBuying (last 12 months)
- $7.2MAmount of InsiderBuying (last 12 months)
- 0Number of InsiderSelling (last 12 months)
- $0.00Amount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
SCULLY WILLIAM P | Buy | May 22, 2026 | $981,300.00 | 100,000 | $9.81 | 836,000 |
Ekman Lars | Award | May 15, 2026 | $0.00 | 27,000 | $0.00 | 27,000 |
Selkoe Dennis J. | Award | May 15, 2026 | $0.00 | 27,000 | $0.00 | 27,000 |
WELCH DANIEL G | Award | May 15, 2026 | $0.00 | 27,000 | $0.00 | 27,000 |
COLLIER RICHARD T | Award | May 15, 2026 | $0.00 | 27,000 | $0.00 | 27,000 |
Walker Karin L Chief Accounting Officer | Award | Mar 03, 2026 | $0.00 | 150,000 | $0.00 | 150,000 |
Zago Wagner M. Chief Scientific Officer | Award | Mar 03, 2026 | $0.00 | 190,000 | $0.00 | 190,000 |
Malecek Michael J Chief Legal Officer | Award | Mar 03, 2026 | $0.00 | 190,000 | $0.00 | 190,000 |
Smith Brandon S. Chief Operating Officer | Award | Mar 03, 2026 | $0.00 | 190,000 | $0.00 | 190,000 |
Swanson Chad J. Chief Development Officer | Award | Mar 03, 2026 | $0.00 | 190,000 | $0.00 | 190,000 |
Nguyen Tran Chief Strategy Officer and CFO | Award | Jul 28, 2025 | $0.00 | 95,000 | $0.00 | 97,205 |
Malecek Michael J Chief Legal Officer | Award | Jul 28, 2025 | $0.00 | 80,000 | $0.00 | 80,000 |
Kinney Gene G. President and CEO | Award | Jul 28, 2025 | $0.00 | 140,000 | $0.00 | 152,793 |
Swanson Chad J. Chief Development Officer | Award | Jul 28, 2025 | $0.00 | 85,000 | $0.00 | 85,000 |
Walker Karin L Chief Accounting Officer | Award | Jul 28, 2025 | $0.00 | 25,000 | $0.00 | 25,000 |
Zago Wagner M. Chief Scientific Officer | Award | Jul 28, 2025 | $0.00 | 85,000 | $0.00 | 85,000 |
Smith Brandon S. Chief Operating Officer | Award | Jul 28, 2025 | $0.00 | 130,000 | $0.00 | 130,000 |
EcoR1 Capital, LLC | Sell | May 06, 2025 | $15.2M | 2.0M | $7.64 | 5.3M |
EcoR1 Capital, LLC | Sell | May 05, 2025 | $7.9M | 977,693 | $8.11 | 7.3M |
EcoR1 Capital, LLC | Sell | May 02, 2025 | $27.7M | 3.3M | $8.36 | 8.3M |
Malecek Michael J Chief Legal Officer | Award | Mar 05, 2025 | $0.00 | 107,500 | $0.00 | 107,500 |
Karp Carol D. Chief Regulatory Officer | Award | Mar 05, 2025 | $0.00 | 107,500 | $0.00 | 107,500 |
Ford David A Chief People Officer | Award | Mar 05, 2025 | $0.00 | 107,500 | $0.00 | 107,500 |
Walker Karin L Chief Accounting Officer | Award | Mar 05, 2025 | $0.00 | 70,000 | $0.00 | 70,000 |
Zago Wagner M. Chief Scientific Officer | Award | Mar 05, 2025 | $0.00 | 107,500 | $0.00 | 107,500 |
Swanson Chad J. Chief Development Officer | Award | Mar 05, 2025 | $0.00 | 107,500 | $0.00 | 107,500 |
Nguyen Tran Chief Strategy Officer and CFO | Award | Mar 05, 2025 | $0.00 | 107,500 | $0.00 | 107,500 |
SCULLY WILLIAM P | Gift | Jan 15, 2025 | $0.00 | 12,000 | $0.00 | 47,000 |
SCULLY WILLIAM P | Buy | Jan 14, 2025 | $1.3M | 100,000 | $12.79 | 735,993 |
SCULLY WILLIAM P | Gift | Jan 03, 2025 | $0.00 | 1,000 | $0.00 | 635,993 |