William P. Scully, 10% Owner at PROTHENA CORP PUBLIC LTD CO (PRTA), bought 50,000 shares at $8.79 ($439K) on 2026-08-20, disclosed to the SEC on 2026-08-21.
Open-market purchase of $439k PRTA by 10% Owner. Below the thresholds we flag for high-conviction alerts (no C-suite role, rare reversal, cluster, or A-grade history). Context: insider career grade D.
Negative factors outweigh the positive ones.
| Filing → |
| PRTA | BUY | 2026-06-12 | $1.0M | — | Filing → |
| PRTA | BUY | 2026-06-05 | $465K | — | Filing → |
| PRTA | BUY | 2026-06-03 | $471K | — | Filing → |