StockCIK 1559053
PROTHENA CORP PUBLIC LTD CO (PRTA): Insider Trades and Fund Holdings
In the past 12 months, PROTHENA CORP PUBLIC LTD CO insiders reported 12 open-market purchases worth $8.65M and 0 sales worth $0.
12Insider buys, 12 months
$8.65MBought by insiders, 12 months
$0Sold by insiders, 12 months
1Tracked funds holding
Recent insider trades
Open-market purchases (code P) and sales (code S) from Form 4. Grants, option exercises and gifts are not shown. Latest filing: Oct 26, 2026.
| Filed | Insider | Type | Value |
|---|---|---|---|
| Oct 26 | William P. Scully10% owner | ▲ BUY | $819K |
| Oct 26 | William P. Scully10% owner | ▲ BUY | $404K |
| Oct 15 | William P. Scully10% owner | ▲ BUY | $835K |
| Oct 15 | William P. Scully10% owner | ▲ BUY | $85K |
| Oct 9 | William P. Scully10% owner | ▲ BUY | $1.05M |
| Oct 9 | William P. Scully10% owner | ▲ BUY | $771K |
| Oct 6 | William P. Scully10% owner | ▲ BUY | $857K |
| Sep 30 | William P. Scully10% owner | ▲ BUY | $1.41M |
| Sep 29 | William P. Scully10% owner | ▲ BUY | $890K |
| Sep 21 | William P. Scully10% owner | ▲ BUY | $843K |
Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings
All 12 PRTA insider trades →Insiders who traded in the past year
| Insider | Role | Buys | Bought | Sells | Sold |
|---|---|---|---|---|---|
| William P. Scully | 10% owner | 12 | $8.65M | 0 | $0 |
Tracked funds that report PRTA
From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.
| Fund | Shares | Value | Change |
|---|---|---|---|
| Renaissance Technologies | 697,615 | $6.83M | ▲ +14.8% |
Source: SEC Form 13F-HR filings, retrieved Oct 28, 2026. How we read filings
Reading these numbers
Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →