| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Across the last three months, Prothena Corporation Plc's insiders have accumulated 888,952 shares worth roughly $7.6M on balance. In the past 30 days, 1 insider bought and 0 sold. The tilt toward buying has held up recently.
The largest recent buyer is SCULLY WILLIAM P (10% Owner), now holding an estimated $8.8M in PRTA.
Classified under Biotechnology (Health Care sector), PRTA's insider flows are most useful compared with peers in the same group.
| Role | Insider | Shares | Value | 30d |
|---|---|---|---|---|
| 10% | 1.04M | $8.77M | +690.5K | |
| Other | 190.0K | - | - | |
| COO | 130.0K | - | - | |
| CFO | 97.2K | - | - | |
| Other | 85.0K | - | - |
Buys and sells only
| Date | Insider | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Oct 14, 2026 | Scully William P | 10% Owner | Buy | 110,000 | $8.36 | $920,049.00 | +11.9% | - | - | |
| Oct 8, 2026 | Scully William P | 10% Owner | Buy | 215,000 | $8.47 | $1,821,054.00 | +68.5% | - | - | |
| Oct 2, 2026 | Scully William P | 10% Owner | Buy | 100,000 | $8.57 | $857,240.00 | +46.7% | - | - | |
| Sep 29, 2026 | Scully William P | 10% Owner | Buy | 162,000 | $8.68 | $1,405,674.00 | +311.5% | - | - | |
| Sep 28, 2026 | Scully William P | 10% Owner | Buy | 103,500 | $8.60 | $889,872.30 | +124.0% | - | - | |
| Sep 18, 2026 | Scully William P | 10% Owner | Buy | 100,000 | $8.43 | $843,460.00 | +12.1% | - | - | |
| Sep 2, 2026 | Scully William P | 10% Owner | Buy | 27,000 | $9.47 | $255,738.60 | +3.4% | - | - | |
| Aug 20, 2026 | Scully William P | 10% Owner | Buy | 50,000 | $8.79 | $439,430.00 | +6.7% | - | - | |
| Aug 7, 2026 | Scully William P | 10% Owner | Buy | 37,500 | $8.62 | $323,220.00 | +81.5% | - | - | |
| Jul 29, 2026 | Isaacs Michael John | General Counsel &Company Sec. | Sell | 8,386 | $8.47 | $71,055.42 | -19.0% | -4.2% | - |