PRTA · Prothena Corporation plc Ordinary Shares
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| EcoR1 Capital, LLC 10% Owner | ▼ Sell | Open Market | 5,304,596 Shares held | 5/6/2025 | View profile |
| William P. Scully | ▲ Buy | Open Market | 800,000 Shares held | 8/20/2026 | View profile |
| Michael J. Malecek Chief Legal Officer | ▲ Buy | Grant | 80,000 Shares held | 7/28/2025 | View profile |
| Gene G. Kinney President and CEO | ▼ Sell | Other | 68,793 Shares held | 7/28/2026 | View profile |
| Anne Evans Kingston Chief Strategy Officer | ▼ Sell | Open Market | 55,782 Shares held | 7/29/2026 | View profile |
| Brandon S. Smith Chief Operating Officer | ▼ Sell | Other | 52,000 Shares held | 7/28/2026 | View profile |
| Chad J. Swanson Chief Development Officer | ▼ Sell | Tax Withholding | 40,733 Shares held | 7/28/2026 | View profile |
| Tran Nguyen Chief Strategy Officer and CFO | ▼ Sell | Other | 40,205 Shares held | 7/28/2026 | View profile |
| Michael John Isaacs General Counsel & Company Sec. | ▼ Sell | Open Market | 35,745 Shares held | 7/29/2026 | View profile |
| Wagner M. Zago Chief Scientific Officer | ▼ Sell | Other | 34,000 Shares held | 7/28/2026 | View profile |
| Karin L. Walker Chief Accounting Officer | ▼ Sell | Other | 10,000 Shares held | 7/28/2026 | View profile |
| Selkoe Dennis J. | ▼ Sell | Open Market | 2,845 Shares held | 7/3/2023 | View profile |
| COLLIER RICHARD T Director | ▼ Sell | Open Market | 1,219 Shares held | 1/5/2023 | View profile |
| Ekman Lars Director | ▼ Sell | Open Market | 243 Shares held | 1/3/2023 | View profile |
| Garren Hideki Director | ▼ Sell | Open Market | 0 Shares held | 9/13/2023 | View profile |
| Karp Carol D. Chief Regulatory Officer | ▼ Sell | Open Market | 0 Shares held | 10/4/2023 | View profile |
| Cooke Shane Director | ▼ Sell | Open Market | 0 Shares held | 1/10/2023 | View profile |
Transaction History
| William P. Scully | ▲ Buy | Open Market | 50,000 | $439K | 8/20/2026 |
| William P. Scully | ▼ Sell | Gift | 627,553 | $0 | 8/18/2026 |
| William P. Scully | ▼ Sell | Gift | 336,000 | $0 | 8/17/2026 |
| William P. Scully | ▼ Sell | Gift | 251,553 | $0 | 8/10/2026 |
| William P. Scully | ▲ Buy | Open Market | 34,000 | $293K | 8/7/2026 |
| William P. Scully | ▲ Buy | Open Market | 3,500 | $30K | 8/7/2026 |
| Anne Evans Kingston | ▼ Sell | Open Market | 7,662 | $65K | 7/29/2026 |
| Michael John Isaacs | ▼ Sell | Open Market | 8,386 | $71K | 7/29/2026 |
| Wagner M. Zago | ▲ Buy | Option Exercise | 51,000 | — | 7/28/2026 |
| Wagner M. Zago | ▼ Sell | Other | 51,000 | $437K | 7/28/2026 |
| Karin L. Walker | ▲ Buy | Option Exercise | 15,000 | — | 7/28/2026 |
| Karin L. Walker | ▼ Sell | Other | 15,000 | $128K | 7/28/2026 |
| Chad J. Swanson | ▲ Buy | Option Exercise | 51,000 | — | 7/28/2026 |
| Chad J. Swanson | ▼ Sell | Other | 40,800 | $349K | 7/28/2026 |
| Chad J. Swanson | ▼ Sell | Tax Withholding | 3,467 | $30K | 7/28/2026 |
| Brandon S. Smith | ▲ Buy | Option Exercise | 78,000 | — | 7/28/2026 |
| Brandon S. Smith | ▼ Sell | Other | 78,000 | $668K | 7/28/2026 |
| Tran Nguyen | ▲ Buy | Option Exercise | 57,000 | — | 7/28/2026 |
| Tran Nguyen | ▼ Sell | Other | 57,000 | $488K | 7/28/2026 |
| Gene G. Kinney | ▲ Buy | Option Exercise | 84,000 | — | 7/28/2026 |
| Gene G. Kinney | ▼ Sell | Other | 84,000 | $719K | 7/28/2026 |
| Anne Evans Kingston | ▼ Sell | Tax Withholding | 3,498 | $30K | 7/28/2026 |
| Michael John Isaacs | ▼ Sell | Tax Withholding | 4,694 | $40K | 7/28/2026 |
| William P. Scully | ▲ Buy | Open Market | 20,000 | $158K | 6/16/2026 |
| William P. Scully | ▼ Sell | Gift | 325,000 | $0 | 6/15/2026 |
| William P. Scully | ▲ Buy | Open Market | 125,000 | $1.0M | 6/11/2026 |
| William P. Scully | ▲ Buy | Open Market | 50,000 | $465K | 6/4/2026 |
| William P. Scully | ▲ Buy | Open Market | 50,000 | $471K | 6/2/2026 |
| William P. Scully | ▲ Buy | Open Market | 100,000 | $981K | 5/22/2026 |
| Wagner M. Zago | ▲ Buy | Grant | 85,000 | $0 | 7/28/2025 |
| Karin L. Walker | ▲ Buy | Grant | 25,000 | $0 | 7/28/2025 |
| Chad J. Swanson | ▲ Buy | Grant | 85,000 | $0 | 7/28/2025 |
| Brandon S. Smith | ▲ Buy | Grant | 130,000 | $0 | 7/28/2025 |
| Tran Nguyen | ▲ Buy | Grant | 95,000 | $0 | 7/28/2025 |
| Michael J. Malecek | ▲ Buy | Grant | 80,000 | $0 | 7/28/2025 |
| Gene G. Kinney | ▲ Buy | Grant | 140,000 | $0 | 7/28/2025 |
| EcoR1 Capital, LLC | ▼ Sell | Open Market | 1,984,053 | $15.2M | 5/6/2025 |
| EcoR1 Capital, LLC | ▼ Sell | Open Market | 977,693 | $7.9M | 5/5/2025 |
| EcoR1 Capital, LLC | ▼ Sell | Open Market | 3,317,938 | $27.7M | 5/2/2025 |
| William P. Scully | ▼ Sell | Gift | 12,000 | $0 | 1/15/2025 |
| William P. Scully | ▲ Buy | Open Market | 100,000 | $1.3M | 1/14/2025 |
| William P. Scully | ▼ Sell | Gift | 1,000 | $0 | 1/3/2025 |
| William P. Scully | ▼ Sell | Gift | 13,200 | $0 | 1/2/2025 |
| William P. Scully | ▲ Buy | Open Market | 1,200 | $16K | 12/31/2024 |
| William P. Scully | ▲ Buy | Open Market | 800 | $11K | 12/31/2024 |
| William P. Scully | ▲ Buy | Open Market | 30,000 | $390K | 12/31/2024 |
| William P. Scully | ▲ Buy | Open Market | 2,000 | $32K | 12/20/2024 |
| William P. Scully | ▼ Sell | Gift | 500 | $0 | 12/20/2024 |
| William P. Scully | ▼ Sell | Gift | 40,000 | $0 | 12/20/2024 |
| William P. Scully | ▼ Sell | Gift | 681,000 | $0 | 12/19/2024 |
| William P. Scully | ▼ Sell | Gift | 430,000 | $0 | 12/18/2024 |
| William P. Scully | ▲ Buy | Open Market | 73,436 | $1.0M | 12/18/2024 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $68K | 1/24/2024 |
| Karin L. Walker | ▼ Sell | Open Market | 5,000 | $170K | 1/24/2024 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $68K | 12/20/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 1,678 | $62K | 12/20/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 3,322 | $124K | 12/20/2023 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $68K | 11/30/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 5,000 | $170K | 11/30/2023 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $68K | 10/25/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 1,789 | $72K | 10/25/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 2,917 | $121K | 10/25/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 294 | $12K | 10/25/2023 |
| Brandon S. Smith | ▲ Buy | Option Exercise | 4,000 | $44K | 10/11/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 3,556 | $166K | 10/11/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 444 | $21K | 10/11/2023 |
| Karp Carol D. | ▲ Buy | Option Exercise | 5,000 | $61K | 10/4/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 4,337 | $202K | 10/4/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 663 | $31K | 10/4/2023 |
| Michael J. Malecek | ▲ Buy | Option Exercise | 5,000 | $51K | 9/27/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 4,596 | $217K | 9/27/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 404 | $20K | 9/27/2023 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $75K | 9/19/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 5,000 | $262K | 9/19/2023 |
| Garren Hideki | ▲ Buy | Option Exercise | 2,000 | $50K | 9/13/2023 |
| Garren Hideki | ▼ Sell | Open Market | 2,000 | $111K | 9/13/2023 |
| Brandon S. Smith | ▲ Buy | Option Exercise | 4,000 | $44K | 9/13/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 3,886 | $216K | 9/13/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 114 | $6K | 9/13/2023 |
| Karp Carol D. | ▲ Buy | Option Exercise | 5,000 | $61K | 9/6/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 4,994 | $273K | 9/6/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 6 | $332 | 9/6/2023 |
| Michael J. Malecek | ▲ Buy | Option Exercise | 5,000 | $51K | 8/30/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 2,322 | $127K | 8/30/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 2,664 | $148K | 8/30/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 14 | $787 | 8/30/2023 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $75K | 8/18/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 5,000 | $286K | 8/18/2023 |
| Garren Hideki | ▲ Buy | Option Exercise | 2,000 | $50K | 8/16/2023 |
| Garren Hideki | ▼ Sell | Open Market | 878 | $51K | 8/16/2023 |
| Garren Hideki | ▼ Sell | Open Market | 748 | $44K | 8/16/2023 |
| Garren Hideki | ▼ Sell | Open Market | 374 | $22K | 8/16/2023 |
| Brandon S. Smith | ▲ Buy | Option Exercise | 4,000 | $44K | 8/16/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 2,226 | $130K | 8/16/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 1,373 | $81K | 8/16/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 401 | $24K | 8/16/2023 |
| Wagner M. Zago | ▲ Buy | Option Exercise | 4,000 | $49K | 8/2/2023 |
| Wagner M. Zago | ▼ Sell | Open Market | 3,771 | $253K | 8/2/2023 |
| Wagner M. Zago | ▼ Sell | Open Market | 229 | $16K | 8/2/2023 |
| Karp Carol D. | ▲ Buy | Option Exercise | 5,000 | $61K | 8/2/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 4,672 | $313K | 8/2/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 328 | $22K | 8/2/2023 |
| Michael J. Malecek | ▲ Buy | Option Exercise | 5,000 | $51K | 7/26/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 2,477 | $153K | 7/26/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 1,903 | $119K | 7/26/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 620 | $39K | 7/26/2023 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $75K | 7/19/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 3,966 | $273K | 7/19/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 1,034 | $72K | 7/19/2023 |
| Garren Hideki | ▲ Buy | Option Exercise | 2,000 | $50K | 7/12/2023 |
| Garren Hideki | ▼ Sell | Open Market | 1,908 | $129K | 7/12/2023 |
| Garren Hideki | ▼ Sell | Open Market | 92 | $6K | 7/12/2023 |
| Brandon S. Smith | ▲ Buy | Option Exercise | 4,000 | $44K | 7/12/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 3,200 | $216K | 7/12/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 800 | $54K | 7/12/2023 |
| Karp Carol D. | ▲ Buy | Option Exercise | 5,000 | $61K | 7/5/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 3,966 | $270K | 7/5/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 1,034 | $71K | 7/5/2023 |
| Wagner M. Zago | ▲ Buy | Option Exercise | 4,000 | $49K | 7/5/2023 |
| Wagner M. Zago | ▼ Sell | Open Market | 2,991 | $203K | 7/5/2023 |
| Wagner M. Zago | ▼ Sell | Open Market | 1,009 | $69K | 7/5/2023 |
| Selkoe Dennis J. | ▲ Buy | Option Exercise | 5,000 | $57K | 7/3/2023 |
| Selkoe Dennis J. | ▼ Sell | Open Market | 5,000 | $337K | 7/3/2023 |
| Michael J. Malecek | ▲ Buy | Option Exercise | 5,000 | $51K | 6/28/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 1,240 | $86K | 6/28/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 3,050 | $213K | 6/28/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 710 | $50K | 6/28/2023 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $75K | 6/20/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 2,000 | $136K | 6/20/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 2,471 | $172K | 6/20/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 529 | $37K | 6/20/2023 |
| Garren Hideki | ▲ Buy | Option Exercise | 7,331 | $183K | 6/16/2023 |
| Garren Hideki | ▼ Sell | Open Market | 7,331 | $542K | 6/16/2023 |
| Brandon S. Smith | ▲ Buy | Option Exercise | 5,333 | $59K | 6/14/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 1,098 | $80K | 6/14/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 1,914 | $140K | 6/14/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 959 | $72K | 6/14/2023 |
| Brandon S. Smith | ▼ Sell | Open Market | 1,362 | $103K | 6/14/2023 |
| Garren Hideki | ▲ Buy | Option Exercise | 4,669 | $116K | 6/14/2023 |
| Garren Hideki | ▼ Sell | Open Market | 509 | $37K | 6/14/2023 |
| Garren Hideki | ▼ Sell | Open Market | 971 | $71K | 6/14/2023 |
| Garren Hideki | ▼ Sell | Open Market | 2,534 | $189K | 6/14/2023 |
| Garren Hideki | ▼ Sell | Open Market | 655 | $49K | 6/14/2023 |
| Wagner M. Zago | ▲ Buy | Option Exercise | 15,000 | $447K | 6/7/2023 |
| Wagner M. Zago | ▲ Buy | Option Exercise | 4,000 | $49K | 6/7/2023 |
| Wagner M. Zago | ▼ Sell | Open Market | 2,943 | $206K | 6/7/2023 |
| Wagner M. Zago | ▼ Sell | Open Market | 12,004 | $852K | 6/7/2023 |
| Wagner M. Zago | ▼ Sell | Open Market | 3,759 | $270K | 6/7/2023 |
| Wagner M. Zago | ▼ Sell | Open Market | 294 | $22K | 6/7/2023 |
| Karp Carol D. | ▲ Buy | Option Exercise | 5,000 | $61K | 6/7/2023 |
| Karp Carol D. | ▲ Buy | Option Exercise | 15,000 | $203K | 6/7/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 3,046 | $213K | 6/7/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 12,782 | $907K | 6/7/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 3,811 | $274K | 6/7/2023 |
| Karp Carol D. | ▼ Sell | Open Market | 361 | $26K | 6/7/2023 |
| Michael J. Malecek | ▲ Buy | Option Exercise | 5,000 | $51K | 5/31/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 3,211 | $206K | 5/31/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 1,078 | $70K | 5/31/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 711 | $47K | 5/31/2023 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $75K | 5/19/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 2,823 | $208K | 5/19/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 2,177 | $162K | 5/19/2023 |
| Gene G. Kinney | ▲ Buy | Option Exercise | 45,000 | $1.3M | 5/17/2023 |
| Gene G. Kinney | ▼ Sell | Open Market | 10,202 | $742K | 5/17/2023 |
| Gene G. Kinney | ▼ Sell | Open Market | 19,864 | $1.5M | 5/17/2023 |
| Gene G. Kinney | ▼ Sell | Open Market | 14,934 | $1.1M | 5/17/2023 |
| Tran Nguyen | ▲ Buy | Option Exercise | 45,000 | $1.3M | 5/17/2023 |
| Tran Nguyen | ▲ Buy | Option Exercise | 50,000 | $1.1M | 5/17/2023 |
| Tran Nguyen | ▼ Sell | Open Market | 14,001 | $1.0M | 5/17/2023 |
| Tran Nguyen | ▼ Sell | Open Market | 34,640 | $2.5M | 5/17/2023 |
| Tran Nguyen | ▼ Sell | Open Market | 37,044 | $2.8M | 5/17/2023 |
| Tran Nguyen | ▼ Sell | Open Market | 9,215 | $695K | 5/17/2023 |
| Tran Nguyen | ▼ Sell | Open Market | 100 | $8K | 5/17/2023 |
| Selkoe Dennis J. | ▲ Buy | Option Exercise | 6,000 | $55K | 5/3/2023 |
| Selkoe Dennis J. | ▲ Buy | Option Exercise | 9,000 | $216K | 5/3/2023 |
| Selkoe Dennis J. | ▼ Sell | Open Market | 15,000 | $855K | 5/3/2023 |
| Michael J. Malecek | ▲ Buy | Option Exercise | 5,000 | $51K | 4/26/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 4,680 | $250K | 4/26/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 320 | $17K | 4/26/2023 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $75K | 4/19/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 2,917 | $154K | 4/19/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 2,083 | $111K | 4/19/2023 |
| Michael J. Malecek | ▲ Buy | Option Exercise | 5,000 | $51K | 3/29/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 2,734 | $133K | 3/29/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 2,266 | $112K | 3/29/2023 |
| Karin L. Walker | ▲ Buy | Option Exercise | 5,000 | $75K | 3/20/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 3,903 | $185K | 3/20/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 1,097 | $53K | 3/20/2023 |
| Karin L. Walker | ▲ Buy | Option Exercise | 20,000 | $301K | 3/15/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 9,431 | $454K | 3/15/2023 |
| Karin L. Walker | ▼ Sell | Open Market | 10,569 | $514K | 3/15/2023 |
| Tran Nguyen | ▲ Buy | Option Exercise | 10,000 | $67K | 3/15/2023 |
| Tran Nguyen | ▼ Sell | Open Market | 4,802 | $231K | 3/15/2023 |
| Tran Nguyen | ▼ Sell | Open Market | 5,198 | $253K | 3/15/2023 |
| Michael J. Malecek | ▲ Buy | Option Exercise | 15,000 | $154K | 3/15/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 6,436 | $310K | 3/15/2023 |
| Michael J. Malecek | ▼ Sell | Open Market | 8,564 | $417K | 3/15/2023 |
| Garren Hideki | ▲ Buy | Option Exercise | 12,000 | $299K | 3/15/2023 |
| Garren Hideki | ▼ Sell | Open Market | 6,000 | $289K | 3/15/2023 |
| Garren Hideki | ▼ Sell | Open Market | 6,000 | $292K | 3/15/2023 |