Arthur W. Homan, 10% Owner at PROTHENA CORP PUBLIC LTD CO (PRTA), bought 150,000 shares at $8.19 ($1.2M) on 2026-10-22, disclosed to the SEC on 2026-10-26.
Open-market purchase of $1.2M 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.
| # | Price | Shares | Value | % of Total |
|---|---|---|---|---|
| 1 | $8.19 | 100,000 | $819K | 67.0% |
| 2 | $8.07 | 50,000 | $404K | 33.0% |
| Total | $8.15 avg | 150,000 | $1.2M | 100% |
| Filing → |
| PRTA | BUY | 2026-10-06 | $857K | — | Filing → |
| PRTA | BUY | 2026-09-30 | $1.4M | — | Filing → |
| PRTA | BUY | 2026-09-29 | $890K | — | Filing → |