Arthur W. Homan, 10% Owner at PROTHENA CORP PUBLIC LTD CO (PRTA), bought 100,000 shares at $8.57 ($857K) on 2026-10-02, disclosed to the SEC on 2026-10-06.
Open-market purchase of $857k 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 | 2026-10-09 | $1.8M | — | Filing → |
| PRTA | BUY | 2026-09-30 | $1.4M | — | Filing → |
| PRTA | BUY | 2026-09-29 | $890K | — | Filing → |