| 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 |
|---|---|---|---|---|---|---|---|---|---|
10% Owner
1 company
Scully William P is a 10% Owner at PRTA. Recent filings cover 23 purchases and 0 sales. Those positions are worth an estimated $8.8M at current prices.
Our model assigns Scully William P a below-average insider score of 29/100, based on 4 past trades. Over a 12-month horizon, 0.0% of those trades were profitable, with an average 12-month return of -29.9%.
Scully William P's largest disclosed position is in PRTA as 10% Owner, worth about $8.8M. Net of sales, the recent Form 4 record there shows accumulation of 1,457,436 shares.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Oct 14, 2026 | PRTA Prothena Corporation Plc | 10% Owner | Buy | 110,000 | $8.36 | $920,049.00 | +11.9% | - | - | |
| Oct 8, 2026 | PRTA Prothena Corporation Plc | 10% Owner | Buy | 215,000 | $8.47 | $1,821,054.00 | +68.5% | - | - | |
| Oct 2, 2026 | PRTA Prothena Corporation Plc | 10% Owner | Buy | 100,000 | $8.57 | $857,240.00 | +46.7% | - | - | |
| Sep 29, 2026 | PRTA Prothena Corporation Plc | 10% Owner | Buy | 162,000 | $8.68 | $1,405,674.00 | +311.5% | - | - | |
| Sep 28, 2026 | PRTA Prothena Corporation Plc | 10% Owner | Buy | 103,500 | $8.60 | $889,872.30 | +124.0% | - | - | |
| Sep 18, 2026 | PRTA Prothena Corporation Plc | 10% Owner | Buy | 100,000 | $8.43 | $843,460.00 | +12.1% | - | - | |
| Sep 2, 2026 | PRTA Prothena Corporation Plc | 10% Owner | Buy | 27,000 | $9.47 | $255,738.60 | +3.4% | - | - | |
| Aug 20, 2026 | PRTA Prothena Corporation Plc | 10% Owner | Buy | 50,000 | $8.79 | $439,430.00 | +6.7% | - | - | |
| Aug 7, 2026 | PRTA Prothena Corporation Plc | 10% Owner | Buy | 37,500 | $8.62 | $323,220.00 | +81.5% | - | - | |
| Jun 16, 2026 | PRTA Prothena Corporation Plc | 10% Owner | Buy | 20,000 | $7.90 | $157,990.00 | +2.7% | - | - |