PRTA
Prothena Corporation plc
NASDAQ: PRTA · HEALTHCARE · BIOTECHNOLOGY
$10.87
-5.56% today
Updated 2026-04-29
Market cap
$619.62M
P/E ratio
—
P/S ratio
63.98x
EPS (TTM)
$-4.53
Dividend yield
—
52W range
$4 – $12
Volume
0.5M
Prothena Corporation plc (PRTA) Insider transactions
Net insider activity
Net selling (1,434,984 shares)
Buy transactions
65
Sell transactions
35
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-04-10 | KINGSTON, ANNE EVANS | Chief Strategy Officer | Buy | 100,000 | — | — |
| 2026-03-03 | ZAGO, WAGNER M. | Chief Scientific Officer | Buy | 190,000 | — | — |
| 2026-03-03 | WALKER, KARIN L | Chief Accounting Officer | Buy | 150,000 | — | — |
| 2026-03-03 | SWANSON, CHAD J. | Chief Development Officer | Buy | 190,000 | — | — |
| 2026-03-03 | SMITH, BRANDON S. | Chief Operating Officer | Buy | 190,000 | — | — |
| 2026-03-03 | NGUYEN, TRAN | Chief Strategy Officer and CFO | Buy | 230,000 | — | — |
| 2026-03-03 | MALECEK, MICHAEL J | Chief Legal Officer | Buy | 190,000 | — | — |
| 2026-03-03 | KINNEY, GENE G. | Director, President and CEO | Buy | 520,000 | — | — |
| 2025-07-28 | ZAGO, WAGNER M. | Chief Scientific Officer | Buy | 85,000 | — | — |
| 2025-07-28 | WALKER, KARIN L | Chief Accounting Officer | Buy | 25,000 | — | — |
| 2025-07-28 | SWANSON, CHAD J. | Chief Development Officer | Buy | 85,000 | — | — |
| 2025-07-28 | SMITH, BRANDON S. | Chief Operating Officer | Buy | 130,000 | — | — |
| 2025-07-28 | NGUYEN, TRAN | Chief Strategy Officer and CFO | Buy | 95,000 | — | — |
| 2025-07-28 | MALECEK, MICHAEL J | Chief Legal Officer | Buy | 80,000 | — | — |
| 2025-07-28 | KINNEY, GENE G. | Director, President and CEO | Buy | 140,000 | — | — |
| 2025-05-14 | WELCH, DANIEL G | Director | Buy | 20,183 | — | — |
| 2025-05-14 | SELKOE, DENNIS J. | Director | Buy | 20,183 | — | — |
| 2025-05-14 | KIM, HELEN SUSAN | Director | Buy | 20,183 | — | — |
| 2025-05-14 | EKMAN, LARS | Director | Buy | 20,183 | — | — |
| 2025-05-14 | DUNN, WILLIAM H. JR. | Director | Buy | 20,183 | — | — |
| 2025-05-14 | COOKE, SHANE | Director | Buy | 20,183 | — | — |
| 2025-05-14 | COLLIER, RICHARD T | Director | Buy | 20,183 | — | — |
| 2025-05-14 | COBB, PAULA K | Director | Buy | 20,183 | — | — |
| 2025-05-06 | ECOR1, CAPITAL, LLC | 10% Owner | Sale | 1,984,053 | $7.64 | $15.16M |
| 2025-05-05 | ECOR1, CAPITAL, LLC | 10% Owner | Sale | 977,693 | $8.11 | $7.93M |
| 2025-05-02 | ECOR1, CAPITAL, LLC | 10% Owner | Sale | 3,317,938 | $8.36 | $27.74M |
| 2025-03-05 | ZAGO, WAGNER M. | Chief Scientific Officer | Buy | 107,500 | — | — |
| 2025-03-05 | WALKER, KARIN L | Chief Accounting Officer | Buy | 70,000 | — | — |
| 2025-03-05 | SWANSON, CHAD J. | Chief Development Officer | Buy | 107,500 | — | — |
| 2025-03-05 | SMITH, BRANDON S. | Chief Operating Officer | Buy | 107,500 | — | — |
| 2025-03-05 | NGUYEN, TRAN | Chief Strategy Officer and CFO | Buy | 107,500 | — | — |
| 2025-03-05 | MALECEK, MICHAEL J | Chief Legal Officer | Buy | 107,500 | — | — |
| 2025-03-05 | KINNEY, GENE G. | Director, President and CEO | Buy | 375,000 | — | — |
| 2025-03-05 | KARP, CAROL D. | Chief Regulatory Officer | Buy | 107,500 | — | — |
| 2025-03-05 | FORD, DAVID A | Chief People Officer | Buy | 107,500 | — | — |
| 2025-01-15 | SCULLY, WILLIAM P | 10% Owner | Sale | 12,000 | — | — |
| 2025-01-14 | SCULLY, WILLIAM P | 10% Owner | Buy | 100,000 | $12.79 | $1.28M |
| 2025-01-03 | SCULLY, WILLIAM P | 10% Owner | Sale | 1,000 | — | — |
| 2025-01-02 | SCULLY, WILLIAM P | 10% Owner | Sale | 13,200 | — | — |
| 2024-12-31 | SCULLY, WILLIAM P | 10% Owner | Buy | 30,000 | $12.99 | $389640.00 |
| 2024-12-31 | SCULLY, WILLIAM P | 10% Owner | Buy | 1,200 | $13.37 | $16038.24 |
| 2024-12-31 | SCULLY, WILLIAM P | 10% Owner | Buy | 800 | $13.39 | $10715.20 |
| 2024-12-20 | SCULLY, WILLIAM P | 10% Owner | Sale | 40,000 | — | — |
| 2024-12-20 | SCULLY, WILLIAM P | 10% Owner | Buy | 2,000 | $15.91 | $31813.00 |
| 2024-12-20 | SCULLY, WILLIAM P | 10% Owner | Sale | 500 | — | — |
| 2024-12-19 | SCULLY, WILLIAM P | 10% Owner | Sale | 681,000 | — | — |
| 2024-12-18 | SCULLY, WILLIAM P | 10% Owner | Buy | 430,000 | — | — |
| 2024-12-18 | SCULLY, WILLIAM P | 10% Owner | Buy | 73,436 | $13.93 | $1.02M |
| 2024-10-01 | SWANSON, CHAD J. | Chief Development Officer | Buy | 40,000 | — | — |
| 2024-05-15 | WELCH, DANIEL G | Director | Buy | 15,000 | — | — |
| 2024-05-15 | SELKOE, DENNIS J. | Director | Buy | 15,000 | — | — |
| 2024-05-15 | KIM, HELEN SUSAN | Director | Buy | 15,000 | — | — |
| 2024-05-15 | EKMAN, LARS | Director | Buy | 15,000 | — | — |
| 2024-05-15 | DUNN, WILLIAM H. JR. | Director | Buy | 15,000 | — | — |
| 2024-05-15 | COOKE, SHANE | Director | Buy | 15,000 | — | — |
| 2024-05-15 | COLLIER, RICHARD T | Director | Buy | 15,000 | — | — |
| 2024-05-15 | COBB, PAULA K | Director | Buy | 15,000 | — | — |
| 2024-03-01 | FORD, DAVID A | Chief People Officer | Buy | 85,000 | — | — |
| 2024-02-27 | ZAGO, WAGNER M. | Chief Scientific Officer | Buy | 85,000 | — | — |
| 2024-02-27 | WALKER, KARIN L | Chief Accounting Officer | Buy | 54,000 | — | — |
| 2024-02-27 | SMITH, BRANDON S. | Chief Operating Officer | Buy | 85,000 | — | — |
| 2024-02-27 | NGUYEN, TRAN | Chief Strategy Officer and CFO | Buy | 85,000 | — | — |
| 2024-02-27 | MALECEK, MICHAEL J | Chief Legal Officer | Buy | 85,000 | — | — |
| 2024-02-27 | KINNEY, GENE G. | President and CEO | Buy | 307,000 | — | — |
| 2024-02-27 | KARP, CAROL D. | Chief Regulatory Officer | Buy | 85,000 | — | — |
| 2024-02-27 | GARREN, HIDEKI | Chief Medical Officer | Buy | 85,000 | — | — |
| 2024-02-21 | WELCH, DANIEL G | Director | Buy | 132,000 | — | — |
| 2024-01-24 | WALKER, KARIN L | Chief Accounting Officer | Sale | 5,000 | — | — |
| 2024-01-24 | WALKER, KARIN L | Chief Accounting Officer | Buy | 5,000 | $13.53 | $67650.00 |
| 2023-12-20 | WALKER, KARIN L | Chief Accounting Officer | Sale | 5,000 | — | — |
| 2023-12-20 | WALKER, KARIN L | Chief Accounting Officer | Buy | 5,000 | $13.53 | $67650.00 |
| 2023-12-20 | WALKER, KARIN L | Chief Accounting Officer | Sale | 3,322 | $37.45 | $124408.57 |
| 2023-12-20 | WALKER, KARIN L | Chief Accounting Officer | Sale | 1,678 | $36.68 | $61543.17 |
| 2023-11-30 | WALKER, KARIN L | Chief Accounting Officer | Sale | 5,000 | — | — |
| 2023-11-30 | WALKER, KARIN L | Chief Accounting Officer | Sale | 5,000 | $34.00 | $170000.00 |
| 2023-10-25 | WALKER, KARIN L | Chief Accounting Officer | Sale | 5,000 | — | — |
| 2023-10-25 | WALKER, KARIN L | Chief Accounting Officer | Buy | 5,000 | $13.53 | $67650.00 |
| 2023-10-25 | WALKER, KARIN L | Chief Accounting Officer | Sale | 2,917 | $41.38 | $120718.00 |
| 2023-10-25 | WALKER, KARIN L | Chief Accounting Officer | Sale | 1,789 | $40.27 | $72043.21 |
| 2023-10-25 | WALKER, KARIN L | Chief Accounting Officer | Sale | 294 | $42.28 | $12430.11 |
| 2023-10-11 | SMITH, BRANDON S. | Chief Operating Officer | Sale | 4,000 | — | — |
| 2023-10-11 | SMITH, BRANDON S. | Chief Operating Officer | Buy | 4,000 | $11.12 | $44480.00 |
| 2023-10-11 | SMITH, BRANDON S. | Chief Operating Officer | Sale | 3,556 | $46.62 | $165786.41 |
| 2023-10-11 | SMITH, BRANDON S. | Chief Operating Officer | Sale | 444 | $47.74 | $21198.20 |
| 2023-10-04 | KARP, CAROL D. | Chief Regulatory Officer | Sale | 5,000 | — | — |
| 2023-10-04 | KARP, CAROL D. | Chief Regulatory Officer | Buy | 5,000 | $12.15 | $60750.00 |
| 2023-10-04 | KARP, CAROL D. | Chief Regulatory Officer | Sale | 4,337 | $46.51 | $201729.05 |
| 2023-10-04 | KARP, CAROL D. | Chief Regulatory Officer | Sale | 663 | $47.29 | $31355.26 |
| 2023-09-27 | MALECEK, MICHAEL J | Chief Legal Officer | Sale | 5,000 | — | — |
| 2023-09-27 | MALECEK, MICHAEL J | Chief Legal Officer | Buy | 5,000 | $10.27 | $51350.00 |
| 2023-09-27 | MALECEK, MICHAEL J | Chief Legal Officer | Sale | 4,596 | $47.29 | $217365.52 |
| 2023-09-27 | MALECEK, MICHAEL J | Chief Legal Officer | Sale | 404 | $48.31 | $19519.18 |
| 2023-09-19 | WALKER, KARIN L | Chief Accounting Officer | Sale | 5,000 | — | — |
| 2023-09-19 | WALKER, KARIN L | Chief Accounting Officer | Sale | 5,000 | $52.36 | $261807.00 |
| 2023-09-13 | SMITH, BRANDON S. | Chief Operating Officer | Sale | 4,000 | — | — |
| 2023-09-13 | SMITH, BRANDON S. | Chief Operating Officer | Buy | 4,000 | $11.12 | $44480.00 |
| 2023-09-13 | SMITH, BRANDON S. | Chief Operating Officer | Sale | 3,886 | $55.48 | $215584.01 |
| 2023-09-13 | SMITH, BRANDON S. | Chief Operating Officer | Sale | 114 | $55.96 | $6379.02 |
| 2023-09-13 | GARREN, HIDEKI | Chief Medical Officer | Sale | 2,000 | — | — |
| 2023-09-13 | GARREN, HIDEKI | Chief Medical Officer | Sale | 2,000 | $55.48 | $110952.20 |