| 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 141,452 shares worth roughly $1.3M on balance. In the past 30 days, 1 insider bought and 2 sold. The bias lately has been to the sell side.
The largest recent buyer is SCULLY WILLIAM P (10% Owner), now holding an estimated $6.8M in PRTA.
Not all activity pointed one way: 2 insiders sold in the same window, though all of them still hold shares. 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% | 790.0K | $7.28M | +37.5K | |
| CEO | 152.8K | $1.41M | - | |
| COO | 130.0K | $1.20M | - | |
| CFO | 97.2K | $896.2K | - | |
| Other | 55.8K | $514.3K | -7,662 |
Buys and sells only
| Date | Insider | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Aug 7, 2026 | Scully William P | 10% Owner | Buy | 37,500 | $8.62 | $323,220.00 | +4.5% | - | - | |
| Jul 29, 2026 | Kingston Anne Evans | Chief Strategy Officer | Sell | 7,662 | $8.47 | $64,919.36 | -12.1% | - | - | |
| Jul 29, 2026 | Isaacs Michael John | General Counsel &Company Sec. | Sell | 8,386 | $8.47 | $71,055.42 | -19.0% | - | - | |
| Jun 16, 2026 | Scully William P | 10% Owner | Buy | 20,000 | $7.90 | $157,990.00 | +2.7% | - | - | |
| May 22, 2026 | Scully William P | 10% Owner | Buy | 100,000 | $9.81 | $981,300.00 | +13.6% | - | - | |
| May 6, 2025 | Ecor1 Capital, LLC75 | 10% Owner | Sell | 6,279,684 | $8.10 | $50,839,807.34 | -23.1% | -5.6% | +52.1% | |
| Jan 14, 2025 | Scully William P | 10% Owner | Buy | 207,436 | $13.26 | $2,749,916.18 | +4.8% | -21.5% | -27.4% | |
| Jan 24, 2024 | Walker Karin L82 | Chief Accounting Officer | Sale+OE | 5,000 | $34.00 | $170,000.00 | -100% | -37.6% | -53.0% | |
| Dec 20, 2023 | Walker Karin L82 | Chief Accounting Officer | Sale+OE | 5,000 | $37.19 | $185,951.73 | -60.1% | -32.0% | -56.6% | |
| Nov 30, 2023 | Walker Karin L82 | Chief Accounting Officer | Sale+OE | 5,000 | $34.00 | $170,000.00 | -100% | -11.0% | -50.2% |