Updated Jul 16, 2026 · Last SEC filing 2026-06-18
PROTHENA CORP PUBLIC LTD CO (PRTA) has filed 12 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-18. 2 Form 8-K material event filings were reported by PRTA in the last 90 days. 1 Form 144 notices of proposed sale were filed for PRTA stock. InsiderAlpha tracks every PRTA SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SEC CIK | 0001559053 |
|---|
| Form 4 filings (90d) | 12 |
|---|---|
| Form 8-K filings (90d) | 2 |
| Form 144 notices (90d) | 1 |
| Latest Form 4 filing | 2026-06-18 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| SCULLY WILLIAM P | 10% Owner | P — Open-market purchase | 20.0K | $7.90 | $158K | SEC | |
| SCULLY WILLIAM P | 10% Owner | G — Bona-fide gift | 325.0K | $0.00 | — | SEC | |
| SCULLY WILLIAM P | 10% Owner | P — Open-market purchase | 125.0K | $8.17 | $1.02M | SEC | |
| SCULLY WILLIAM P | 10% Owner | P — Open-market purchase | 50.0K | $9.31 | $465K | SEC | |
| SCULLY WILLIAM P | 10% Owner | P — Open-market purchase | 50.0K | $9.43 | $471K | SEC | |
| SCULLY WILLIAM P | 10% Owner | P — Open-market purchase | 100.0K | $9.81 | $981K | SEC | |
| Kinney Gene G. | President and CEO | A — Grant or award | 140.0K | $0.00 | — | SEC | |
| Nguyen Tran | Chief Strategy Officer and CFO | A — Grant or award | 95.0K | $0.00 | — | SEC | |
| Smith Brandon S. | Chief Operating Officer | A — Grant or award | 130.0K | $0.00 | — | SEC | |
| Malecek Michael J | Chief Legal Officer | A — Grant or award | 80.0K | $0.00 | — | SEC | |
| Zago Wagner M. | Chief Scientific Officer | A — Grant or award | 85.0K | $0.00 | — | SEC | |
| Walker Karin L | Chief Accounting Officer | A — Grant or award | 25.0K | $0.00 | — | SEC | |
| Swanson Chad J. | Chief Development Officer | A — Grant or award | 85.0K | $0.00 | — | SEC | |
| SCULLY WILLIAM P | Insider | G — Bona-fide gift | 12.0K | $0.00 | — | SEC | |
| SCULLY WILLIAM P | Insider | P — Open-market purchase | 100.0K | $12.79 | $1.28M | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for PROTHENA CORP PUBLIC LTD CO (PRTA). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| SCULLY WILLIAM P | 6 | $3.10M |
| COLLIER RICHARD T | 1 | — |
| WELCH DANIEL G | 1 | — |
| Cooke Shane | 1 | — |
| Selkoe Dennis J. | 1 | — |
Form 144 must be filed before insiders sell restricted or control stock above SEC thresholds. A cluster of Form 144 notices often precedes a wave of insider distribution.
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in PRTA insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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