PRTA insider buying
Every open-market purchase of Prothena Corp Public Ltd Co (PRTA) stock by its officers, directors and major shareholders, from SEC Form 4 filings.
Bought, last 12 months$12.08M
Insiders buying (12m)1
Purchases on record15
Last purchase filedOct 26, 2026
In the last 12 months, 1 insider of Prothena Corp Public Ltd Co bought $12.08M of PRTA stock on the open market in 15 reported purchases. The most recent was filed on Oct 26, 2026: Scully William P (10% Owner) bought 150,000 shares at $8.15, worth $1.22M. The largest purchase on record here is $1.82M by Scully William P on Oct 7, 2026.
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| Filed | Insider | Value | Shares | Price | Stake | Trade | |
|---|---|---|---|---|---|---|---|
| Oct 26 | Scully William P10% Owner | $1.22M | 150,000 | $8.15 | +14% | Oct 22 | SEC |
| Oct 15 | Scully William P10% Owner | $920.05K | 110,000 | $8.36 | +12% | Oct 13 | SEC |
| Oct 9 | Scully William P10% Owner | $1.82M | 215,000 | $8.47 | +68% | Oct 7 | SEC |
| Oct 6 | Scully William P10% Owner | $857.24K | 100,000 | $8.57 | +47% | Oct 2 | SEC |
| Sep 30 | Scully William P10% Owner | $1.41M | 162,000 | $8.68 | +312% | Sep 29 | SEC |
| Sep 29 | Scully William P10% Owner | $890.10K | 103,500 | $8.60 | +124% | Sep 28 | SEC |
| Sep 21 | Scully William P10% Owner | $843K | 100,000 | $8.43 | +12% | Sep 18 | SEC |
| Sep 3 | Scully William P10% Owner | $255.69K | 27,000 | $9.47 | +3% | Sep 2 | SEC |
| Aug 21 | Scully William P10% Owner | $439.50K | 50,000 | $8.79 | +7% | Aug 20 | SEC |
| Aug 10 | Scully William P10% Owner | $323.25K | 37,500 | $8.62 | +5% | Aug 7 | SEC |
| Jun 18 | Scully William P10% Owner | $158K | 20,000 | $7.90 | +3% | Jun 16 | SEC |
| Jun 12 | Scully William P10% Owner | $1.02M | 125,000 | $8.17 | +13% | Jun 11 | SEC |
| Jun 5 | Scully William P10% Owner | $465.50K | 50,000 | $9.31 | +6% | Jun 4 | SEC |
| Jun 3 | Scully William P10% Owner | $471.50K | 50,000 | $9.43 | +6% | Jun 2 | SEC |
| May 26 | Scully William P10% Owner | $981K | 100,000 | $9.81 | +14% | May 22 | SEC |