PRTA (Prothena Corporation plc Ordinary Shares)
Insider Trading Activity
Every open-market purchase and sale reported by PRTA officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-21 | WILLIAM P SCULLY | 10%+ Owner | Buy | — | — |
| 2026-09-03 | WILLIAM P SCULLY | 10%+ Owner | Buy | — | — |
| 2026-08-21 | WILLIAM P SCULLY | 10%+ Owner | Buy | — | — |
| 2026-08-18 | WILLIAM P SCULLY | 10%+ Owner | G | — | — |
| 2026-08-11 | WILLIAM P SCULLY | 10%+ Owner | G | — | — |
| 2026-08-10 | WILLIAM P SCULLY | 10%+ Owner | Buy | — | — |
| 2026-07-30 | Anne Evans Kingston | Chief Strategy Officer | MIXED | — | — |
| 2026-07-30 | Karin L Walker | Chief Accounting Officer | MIXED | — | — |
| 2026-07-30 | Tran Nguyen | Chief Strategy Officer and CFO | MIXED | — | — |
| 2026-07-30 | Brandon S. Smith | Chief Operating Officer | MIXED | — | — |
| 2026-07-30 | Michael John Isaacs | General Counsel & Company Sec. | MIXED | — | — |
| 2026-07-30 | Chad J. Swanson | Chief Development Officer | MIXED | — | — |
| 2026-07-30 | Wagner M. Zago | Chief Scientific Officer | MIXED | — | — |
| 2026-07-30 | Gene G. Kinney | President and CEO | MIXED | — | — |
| 2026-06-18 | WILLIAM P SCULLY | 10%+ Owner | Buy | — | — |
| 2026-06-16 | WILLIAM P SCULLY | 10%+ Owner | G | — | — |
| 2026-06-12 | WILLIAM P SCULLY | 10%+ Owner | Buy | — | — |
| 2026-06-05 | WILLIAM P SCULLY | 10%+ Owner | Buy | — | — |
| 2026-06-03 | WILLIAM P SCULLY | 10%+ Owner | Buy | — | — |
| 2026-05-26 | WILLIAM P SCULLY | 10%+ Owner | Buy | — | — |
| 2026-05-15 | Shane Cooke | Director | A | — | — |
| 2026-05-15 | Lars Ekman | Director | A | — | — |
| 2026-05-15 | Dennis J. Selkoe | Director | A | — | — |
| 2026-05-15 | RICHARD T COLLIER | Director | A | — | — |
| 2026-05-15 | William H. Dunn Jr. | Director | A | — | — |
| 2026-05-15 | DANIEL G WELCH | Director | A | — | — |
| 2026-04-10 | Anne Evans Kingston | Chief Strategy Officer | A | — | — |
| 2026-03-05 | Tran Nguyen | Chief Strategy Officer and CFO | A | — | — |
| 2026-03-05 | Wagner M. Zago | Chief Scientific Officer | A | — | — |
| 2026-03-05 | Gene G. Kinney | President and CEO | A | — | — |
| 2026-03-05 | Karin L Walker | Chief Accounting Officer | A | — | — |
| 2026-03-05 | Chad J. Swanson | Chief Development Officer | A | — | — |
| 2026-03-05 | Brandon S. Smith | Chief Operating Officer | A | — | — |
| 2026-03-05 | Michael J Malecek | Chief Legal Officer | A | — | — |
| 2025-07-30 | Michael J Malecek | Chief Legal Officer | A | — | — |
| 2025-07-30 | Karin L Walker | Chief Accounting Officer | A | — | — |
| 2025-07-30 | Brandon S. Smith | Chief Operating Officer | A | — | — |
| 2025-07-30 | Wagner M. Zago | Chief Scientific Officer | A | — | — |
| 2025-07-30 | Tran Nguyen | Chief Strategy Officer and CFO | A | — | — |
| 2025-07-30 | Gene G. Kinney | President and CEO | A | — | — |
| 2025-07-30 | Chad J. Swanson | Chief Development Officer | A | — | — |
| 2025-05-16 | Shane Cooke | Director | A | — | — |
| 2025-05-16 | Dennis J. Selkoe | Director | A | — | — |
| 2025-05-16 | Helen Susan Kim | Director | A | — | — |
| 2025-05-16 | William H. Dunn Jr. | Director | A | — | — |
| 2025-05-16 | Paula K Cobb | Director | A | — | — |
| 2025-05-16 | Lars Ekman | Director | A | — | — |
| 2025-05-16 | RICHARD T COLLIER | Director | A | — | — |
| 2025-05-16 | DANIEL G WELCH | Director | A | — | — |
| 2025-05-06 | EcoR1 Capital, LLC | 10%+ Owner | Sell | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | 10%+ Owner | 8,266,342 | — |
| — | 10%+ Owner | 1,010,500 | — |
| — | Chief Strategy Officer and CFO | 97,205 | — |
| — | Chief Scientific Officer | 85,000 | — |
| — | Chief Legal Officer | 80,000 | — |
| — | President and CEO | 68,793 | — |
| — | Chief Strategy Officer | 55,782 | — |
| — | Chief Operating Officer | 52,000 | — |
| — | President and CEO | 42,910 | — |
| — | Chief Development Officer | 40,733 | — |
| — | General Counsel & Company Sec. | 35,745 | — |
| — | Chief Medical Officer | 30,000 | — |
| — | Chief Accounting Officer | 25,000 | — |
| — | Director | 9,208 | — |
| — | Director | 6,219 | — |
| — | Director | 3,148 | — |
| — | Chief Business Officer | 2,000 | — |
| — | Chief Legal Officer | 2,000 | — |
| — | Controller | 335 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the PRTA quote page; the site-wide leaderboard is on the insider transactions hub.