🕵️ Prothena Corp Public Ltd Co ($PRTA)
SEC insider & ownership activity, last 12 months · CIK 1559053 · every row links its SEC filing
Insider buy value was withheld pending verification over the last 12 months. William P. Scully added 9.8% → 10.3%; Todd W. Fennell added 9.8% → 10.2%. No red-flag 8-Ks in the window.
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Insider flow
1 buyer, value withheld pending verification (9 lots) · 2 sellers, $136K (2 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| William P. Scully | 9 | value withheld pending verification | 0 | – | Sep 2, 2026 |
| Isaacs Michael John | 0 | – | 1 | $71K | Jul 29, 2026 |
| Kingston Anne Evans | 0 | – | 1 | $65K | Jul 29, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| FMR LLC | 13.8% | 13G | Aug 6, 2026 | filing ↗ | |
| Abigail P. Johnson | 13.8% | 13G | Aug 6, 2026 | filing ↗ | |
| William P. Scully | 10.3% | 13G | May 11, 2026 | filing ↗ | |
| Todd W. Fennell | 10.2% | 13G | Aug 19, 2026 | filing ↗ | |
| Wellington Management Company LLP | 9.5% | 13G | Feb 10, 2025 | filing ↗ | |
| Rubric Capital Management LP | 9.3% | 13G | May 15, 2026 | filing ↗ | |
| David Rosen | 9.3% | 13G | May 15, 2026 | filing ↗ | |
| BlackRock, Inc. | 6.9% | 13G | Jul 29, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Anne Kingston | $65K | Jul 29, 2026 | filing ↗ |
| Michael John Isaacs | $71K | Jul 29, 2026 | filing ↗ |
| Michael J. Malecek | $740K | Jun 9, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Aug 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 6, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 14, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 27, 2026 | filing ↗ |
| Other events (8.01) | Feb 27, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 27, 2026 | filing ↗ |
| Earnings (2.02) | Feb 19, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 19, 2026 | filing ↗ |
| Officer/director changes (5.02) | Dec 10, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 10, 2025 | filing ↗ |
| Shareholder vote (5.07) | Nov 19, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 19, 2025 | filing ↗ |
| Earnings (2.02) | Nov 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 6, 2025 | filing ↗ |