PROTHENA PLC (PRTA) — insider trading
Health Care · NASDAQ
PROTHENA PLC (PRTA) has 46 reported SEC Form 4 insider transactions in our data, including 13 open-market purchases and 2 open-market sales among the most recent 46 (latest 2026-10-02).
Recent Form 4 transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-10-02 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 100,000 | $8.57 | $857.2K | Form 4 |
| 2026-09-29 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 162,000 | $8.68 | $1.41M | Form 4 |
| 2026-09-28 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 103,500 | $8.60 | $889.9K | Form 4 |
| 2026-09-18 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 100,000 | $8.43 | $843.5K | Form 4 |
| 2026-09-02 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 27,000 | $9.47 | $255.7K | Form 4 |
| 2026-08-20 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 50,000 | $8.79 | $439.4K | Form 4 |
| 2026-08-18 | SCULLY WILLIAM P | 10% owner | Bona fide gift | 627,553 | — | $0 | Form 4 |
| 2026-08-17 | SCULLY WILLIAM P | 10% owner | Bona fide gift | 336,000 | — | $0 | Form 4 |
| 2026-08-10 | SCULLY WILLIAM P | 10% owner | Bona fide gift | 251,553 | — | $0 | Form 4 |
| 2026-08-07 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 3,500 | $8.62 | $30.2K | Form 4 |
| 2026-08-07 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 34,000 | $8.62 | $293.1K | Form 4 |
| 2026-07-29 | Isaacs Michael John | Officer (General Counsel & Company Sec.) | Open-market sale | 8,386 | $8.47 | $71.1K | Form 4 |
| 2026-07-29 | Kingston Anne Evans | Officer (Chief Strategy Officer) | Open-market sale | 7,662 | $8.47 | $64.9K | Form 4 |
| 2026-07-28 | Isaacs Michael John | Officer (General Counsel & Company Sec.) | Shares withheld for taxes / exercise cost | 4,694 | $8.56 | $40.2K | Form 4 |
| 2026-07-28 | Kingston Anne Evans | Officer (Chief Strategy Officer) | Shares withheld for taxes / exercise cost | 3,498 | $8.56 | $29.9K | Form 4 |
| 2026-07-28 | Kinney Gene G. | Director, Officer (President and CEO) | Option exercise / conversion (derivative) | 84,000 | — | $0 | Form 4 |
| 2026-07-28 | Kinney Gene G. | Director, Officer (President and CEO) | Disposition to the issuer | 84,000 | $8.56 | $719.0K | Form 4 |
| 2026-07-28 | Kinney Gene G. | Director, Officer (President and CEO) | Option exercise / conversion | 84,000 | — | — | Form 4 |
| 2026-07-28 | Nguyen Tran | Officer (Chief Strategy Officer and CFO) | Option exercise / conversion (derivative) | 57,000 | — | $0 | Form 4 |
| 2026-07-28 | Nguyen Tran | Officer (Chief Strategy Officer and CFO) | Disposition to the issuer | 57,000 | $8.56 | $487.9K | Form 4 |
| 2026-07-28 | Nguyen Tran | Officer (Chief Strategy Officer and CFO) | Option exercise / conversion | 57,000 | — | — | Form 4 |
| 2026-07-28 | Smith Brandon S. | Officer (Chief Operating Officer) | Option exercise / conversion (derivative) | 78,000 | — | $0 | Form 4 |
| 2026-07-28 | Smith Brandon S. | Officer (Chief Operating Officer) | Disposition to the issuer | 78,000 | $8.56 | $667.7K | Form 4 |
| 2026-07-28 | Smith Brandon S. | Officer (Chief Operating Officer) | Option exercise / conversion | 78,000 | — | — | Form 4 |
| 2026-07-28 | Swanson Chad J. | Officer (Chief Development Officer) | Option exercise / conversion (derivative) | 51,000 | — | $0 | Form 4 |
| 2026-07-28 | Swanson Chad J. | Officer (Chief Development Officer) | Shares withheld for taxes / exercise cost | 3,467 | $8.56 | $29.7K | Form 4 |
| 2026-07-28 | Swanson Chad J. | Officer (Chief Development Officer) | Disposition to the issuer | 40,800 | $8.56 | $349.2K | Form 4 |
| 2026-07-28 | Swanson Chad J. | Officer (Chief Development Officer) | Option exercise / conversion | 51,000 | — | — | Form 4 |
| 2026-07-28 | Walker Karin L | Officer (Chief Accounting Officer) | Option exercise / conversion (derivative) | 15,000 | — | $0 | Form 4 |
| 2026-07-28 | Walker Karin L | Officer (Chief Accounting Officer) | Disposition to the issuer | 15,000 | $8.56 | $128.4K | Form 4 |
| 2026-07-28 | Walker Karin L | Officer (Chief Accounting Officer) | Option exercise / conversion | 15,000 | — | — | Form 4 |
| 2026-07-28 | Zago Wagner M. | Officer (Chief Scientific Officer) | Option exercise / conversion (derivative) | 51,000 | — | $0 | Form 4 |
| 2026-07-28 | Zago Wagner M. | Officer (Chief Scientific Officer) | Disposition to the issuer | 51,000 | $8.56 | $436.6K | Form 4 |
| 2026-07-28 | Zago Wagner M. | Officer (Chief Scientific Officer) | Option exercise / conversion | 51,000 | — | — | Form 4 |
| 2026-06-16 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 20,000 | $7.90 | $158.0K | Form 4 |
| 2026-06-15 | SCULLY WILLIAM P | 10% owner | Bona fide gift | 325,000 | — | $0 | Form 4 |
| 2026-06-11 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 125,000 | $8.17 | $1.02M | Form 4 |
| 2026-06-04 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 50,000 | $9.31 | $465.3K | Form 4 |
| 2026-06-02 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 50,000 | $9.43 | $471.3K | Form 4 |
| 2026-05-22 | SCULLY WILLIAM P | 10% owner | Open-market purchase | 100,000 | $9.81 | $981.3K | Form 4 |
| 2026-05-15 | COLLIER RICHARD T | Director | Grant / award / vesting (derivative) | 27,000 | — | $0 | Form 4 |
| 2026-05-15 | Cooke Shane | Director | Grant / award / vesting (derivative) | 27,000 | — | $0 | Form 4 |
| 2026-05-15 | Dunn William H. Jr. | Director | Grant / award / vesting (derivative) | 27,000 | — | $0 | Form 4 |
| 2026-05-15 | Ekman Lars | Director | Grant / award / vesting (derivative) | 27,000 | — | $0 | Form 4 |
| 2026-05-15 | Selkoe Dennis J. | Director | Grant / award / vesting (derivative) | 27,000 | — | $0 | Form 4 |
| 2026-05-15 | WELCH DANIEL G | Director | Grant / award / vesting (derivative) | 27,000 | — | $0 | Form 4 |
Ask the chat about PRTA's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: PROTHENA PLC (PRTA).
Last updated 2026-10-02 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.