PRTA NASDAQ
Prothena Corporation plc
1W: -4.6%
1M: -12.2%
3M: +4.3%
YTD: +2.3%
1Y: +29.1%
3Y: -87.2%
5Y: -59.0%
$9.83
+0.42 (+4.46%)
Weekly Expected Move ±8.3%
$8
$9
$10
$11
$11
Overview
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ETF Exposure
Dark Pool
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🏦 Institutional Activity
Latest: Q1 2026208
Institutions Holding
-5 vs prior
64.0%
Ownership
-20.72%
27
New
61
Increased
85
Reduced
42
Closed
👔 Insider Trades
23 records| Date | Name | Title | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2025-07-28 | Kinney Gene G. | officer: president and ceo | A-Grant/Award | 140,000 | $— | $0 | Filing |
| 2025-07-28 | Malecek Michael J | officer: chief legal officer | A-Grant/Award | 80,000 | $— | $0 | Filing |
| 2025-07-28 | Nguyen Tran | officer: chief strategy officer and cfo | A-Grant/Award | 95,000 | $— | $0 | Filing |
| 2025-07-28 | Smith Brandon S. | officer: chief operating officer | A-Grant/Award | 130,000 | $— | $0 | Filing |
| 2025-07-28 | Swanson Chad J. | officer: chief development officer | A-Grant/Award | 85,000 | $— | $0 | Filing |
| 2025-07-28 | Walker Karin L | officer: chief accounting officer | A-Grant/Award | 25,000 | $— | $0 | Filing |
| 2025-07-28 | Zago Wagner M. | officer: chief scientific officer | A-Grant/Award | 85,000 | $— | $0 | Filing |
| 2025-05-06 | EcoR1 Capital, LLC | 10% owner | S-Sale | 1,984,053 | $7.64 | $15.2M | Filing |
| 2025-05-05 | EcoR1 Capital, LLC | 10% owner | S-Sale | 977,693 | $8.11 | $7.9M | Filing |
| 2025-05-02 | EcoR1 Capital, LLC | 10% owner | S-Sale | 3,317,938 | $8.36 | $27.7M | Filing |
| 2025-01-15 | SCULLY WILLIAM P | 10% owner | G-Gift | 12,000 | $— | $0 | Filing |
| 2025-01-14 | SCULLY WILLIAM P | 10% owner | P-Purchase | 100,000 | $12.79 | $1.3M | Filing |
| 2025-01-03 | SCULLY WILLIAM P | 10% owner | G-Gift | 1,000 | $— | $0 | Filing |
| 2025-01-02 | SCULLY WILLIAM P | 10% owner | G-Gift | 13,200 | $— | $0 | Filing |
| 2024-12-31 | SCULLY WILLIAM P | 10% owner | P-Purchase | 1,200 | $13.37 | $16K | Filing |
| 2024-12-31 | SCULLY WILLIAM P | 10% owner | P-Purchase | 800 | $13.39 | $11K | Filing |
| 2024-12-31 | SCULLY WILLIAM P | 10% owner | P-Purchase | 30,000 | $12.99 | $390K | Filing |
| 2024-12-20 | SCULLY WILLIAM P | 10% owner | P-Purchase | 2,000 | $15.91 | $32K | Filing |
| 2024-12-20 | SCULLY WILLIAM P | 10% owner | G-Gift | 500 | $— | $0 | Filing |
| 2024-12-20 | SCULLY WILLIAM P | 10% owner | G-Gift | 40,000 | $— | $0 | Filing |
| 2024-12-19 | SCULLY WILLIAM P | 10% owner | G-Gift | 681,000 | $— | $0 | Filing |
| 2024-12-18 | SCULLY WILLIAM P | 10% owner | G-Gift | 430,000 | $— | $0 | Filing |
| 2024-12-18 | SCULLY WILLIAM P | 10% owner | P-Purchase | 73,436 | $13.93 | $1.0M | Filing |
🏛️ Congressional Trades
0 records| Date | Politician | Chamber | Type | Amount | Filing |
|---|---|---|---|---|---|
| No congressional trades found | |||||
🏦 Top Institutional Holders
20 holders| Holder | Shares | Value | Date Reported | Filing | |
|---|---|---|---|---|---|
| FMR LLC | 7,551,218 | $73M | — | 2026-03-31 | Filing |
| BlackRock, Inc. | 4,644,160 | $45M | +536,701 | 2026-03-31 | Filing |
| STATE STREET CORP | 1,938,498 | $19M | -329,304 | 2026-03-31 | Filing |
| ADAR1 Capital Management, LLC | 1,581,443 | $15M | +123,679 | 2026-03-31 | Filing |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1,445,979 | $14M | +1,445,979 | 2026-03-31 | Filing |
| Palo Alto Investors LP | 1,208,568 | $12M | -111,942 | 2026-03-31 | Filing |
| GEODE CAPITAL MANAGEMENT, LLC | 1,098,166 | $11M | +35,097 | 2026-03-31 | Filing |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 972,017 | $9M | -5,994 | 2026-03-31 | Filing |
| GOLDMAN SACHS GROUP INC | 818,885 | $8M | -116,448 | 2026-03-31 | Filing |
| DIMENSIONAL FUND ADVISORS LP | 782,603 | $8M | +7,396 | 2026-03-31 | Filing |
| Nuveen, LLC | 759,368 | $7M | +261 | 2026-03-31 | Filing |
| Qube Research & Technologies Ltd | 614,603 | $6M | +206,914 | 2026-03-31 | Filing |
| RENAISSANCE TECHNOLOGIES LLC | 607,515 | $6M | +172,000 | 2026-03-31 | Filing |
| Mariner, LLC | 563,082 | $5M | -14,856 | 2026-03-31 | Filing |
| MONIMUS CAPITAL MANAGEMENT, LP | 485,617 | $5M | +231,495 | 2026-03-31 | Filing |
| VANGUARD CAPITAL MANAGEMENT LLC | 484,126 | $5M | +484,126 | 2026-03-31 | Filing |
| Rangeley Capital, LLC | 449,460 | $4M | -75,140 | 2026-03-31 | Filing |
| Birchview Capital, LP | 449,019 | $4M | +8,000 | 2026-03-31 | Filing |
| ARMISTICE CAPITAL, LLC | 439,411 | $4M | -1,060,589 | 2026-03-31 | Filing |
| BNP PARIBAS FINANCIAL MARKETS | 424,596 | $4M | +641 | 2026-03-31 | Filing |