PRTA: PROTHENA CORP PUBLIC LTD CO insider trading, 5% holders and institutional ownership
From public SEC filings: open-market insider purchases and sales (Form 4, last 180 days), holders of 5% or more (Schedules 13D and 13G) and institutional ownership (Form 13F). Insider and 5% data delayed 48 hours.
Insider trading
7 open-market buys totaling $5.89M and 0 sales totaling - in the last 180 days.
Insider buys
| Score | Ticker | Company | Insider | Role | Trade date | Value | Holding + | Cluster |
|---|---|---|---|---|---|---|---|---|
| 27 | PRTA | PROTHENA CORP PUBLIC LTD CO | Scully William P | 10% Owner | 2026-10-14 | $85K | 1% | |
| 35 | PRTA | PROTHENA CORP PUBLIC LTD CO | Scully William P | 10% Owner | 2026-10-13 | $835K | 11% | |
| 37 | PRTA | PROTHENA CORP PUBLIC LTD CO | Scully William P | 10% Owner | 2026-10-08 | $771K | 20% | |
| 43 | PRTA | PROTHENA CORP PUBLIC LTD CO | Scully William P | 10% Owner | 2026-10-07 | $1.05M | 40% | |
| 44 | PRTA | PROTHENA CORP PUBLIC LTD CO | Scully William P | 10% Owner | 2026-10-02 | $857K | 47% | |
| 49 | PRTA | PROTHENA CORP PUBLIC LTD CO | Scully William P | 10% Owner | 2026-09-29 | $1.41M | 312% | |
| 48 | PRTA | PROTHENA CORP PUBLIC LTD CO | Scully William P | 10% Owner | 2026-09-28 | $890K | 124% |
Activist and 5% holders
| Filed | What | Holder | Stake | Change | Filing |
|---|---|---|---|---|---|
| 2026-08-19 | 13G amendment | Fennell Todd W. | 10.20% | SEC | |
| 2026-08-06 | 13G amendment | FMR LLC | 13.80% | SEC |
Get new insider and activist filings the morning after: daily alerts. Not investment advice.