Prothena Corp Public Ltd Co
PRTA- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001559053
In the last 90 days, Prothena Corp Public Ltd Co insiders filed 4 open-market purchases and 2 sales; 187 institutions reported holding it in 13F filings for Q2 2026, worth $462.7M in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Prothena Corp Public Ltd Co insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 4 filings
- 1 insider, $1.86M in total
- Open-market sells
- 2 filings
- 2 insiders, $136.0K in total
- Insiders trading
- 3
- Net value
- +$1.73M
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Prothena Corp Public Ltd Co, current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Scully William P | 10% Owner | 927,000 | Sep 21, 2026 | 12 |
| Zago Wagner M. | Chief Scientific Officer | 34,000 | Jul 30, 2026 | 2 |
| Walker Karin L | Chief Accounting Officer | 10,000 | Jul 30, 2026 | 2 |
| Swanson Chad J. | Chief Development Officer | 40,733 | Jul 30, 2026 | 2 |
| Smith Brandon S. | Chief Operating Officer | 52,000 | Jul 30, 2026 | 2 |
| Nguyen Tran | Chief Strategy Officer and CFO | 40,205 | Jul 30, 2026 | 2 |
| Kinney Gene G. | President and CEO | 68,793 | Jul 30, 2026 | 2 |
| Kingston Anne Evans | Chief Strategy Officer | 55,782 | Jul 30, 2026 | 2 |
| Isaacs Michael John | General Counsel & Company Sec. | 35,745 | Jul 30, 2026 | 1 |
| Collier Richard T | Director | 1,219 | May 15, 2026 | 1 |
| Welch Daniel G | Director | – | May 15, 2026 | 1 |
| Ekman Lars | Director | 243 | May 15, 2026 | 1 |
| Cooke Shane | Director | 0 | May 15, 2026 | 1 |
| Selkoe Dennis J. | Director | 2,845 | May 15, 2026 | 1 |
| Dunn William H. Jr. | Director | – | May 15, 2026 | 1 |
| Malecek Michael J | Chief Legal Officer | 80,000 | Mar 5, 2026 | 1 |
| Kim Helen Susan | Director | – | May 16, 2025 | 0 |
| Cobb Paula K | Director | – | May 16, 2025 | 0 |
| EcoR1 Capital, LLC | 10% Owner | 5,304,596Indirect | May 6, 2025 | 0 |
| Karp Carol D. | Chief Regulatory Officer | 0 | Mar 7, 2025 | 0 |
| Ford David A | Chief People Officer | – | Mar 7, 2025 | 0 |
| Garren Hideki | Chief Medical Officer | 0 | Feb 29, 2024 | 0 |
| Harfstrand Karl Anders Olof | Director | – | May 19, 2023 | 0 |
| Patel Sanjiv | Director | – | May 27, 2022 | 0 |
| Tripuraneni Radhika | Chief Development Officer | – | Feb 25, 2022 | 0 |
| Henney Christopher S | Director | 0 | Jul 16, 2021 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Apr 13, 2022 (view filing) | Apr 11 | 2 days | Cooke ShaneDirector | SSaleOrdinary Shares, par value $0.01 per share | −5.00K | $35.08 | −$175.4K | −100.0%0 after | 3 lots |
| Apr 7, 2022 (view filing) | Apr 5 | 2 days | Collier Richard TDirector | SSaleOrdinary Shares, par value $0.01 per share | −5.00K | $39.41 | −$197.0K | −80.4%1.22K after | 2 lots |
| Jan 12, 2022 (view filing) | Jan 12 | Same day | EcoR1 Capital, LLC10% Owner | PPurchase | +300.0K | $37.50 | +$11.3M | +2.7%11.6M after | |
| Jan 5, 2022 (view filing) | Jan 3 | 2 days | Selkoe Dennis J.Director | SSaleOrdinary Shares, par value $0.01 per share | −5.00K | $47.45 | −$237.2K | −63.7%2.85K after | 3 lots |
| Nov 26, 2021 (view filing) | Nov 23 | 3 days | Walker Karin LChief Accounting Officer | SSaleOrdinary Shares, par value $0.01 per share | −4.52K | $57.88 | −$261.6K | −100.0%0 after | 2 lots |
| Nov 19, 2021 (view filing) | Nov 19 | Same day | Malecek Michael JSee Remarks | SSaleOrdinary Shares, par value $0.01 per share | −10.0K | $55.00 | −$550.0K | −100.0%0 after | |
| Nov 3, 2021 (view filing) | Nov 1 | 2 days | Karp Carol D.Chief Regulatory Officer | SSaleOrdinary Shares, par value $0.01 per share | −10.0K | $57.18 | −$571.8K | −100.0%0 after | 3 lots |
| Oct 29, 2021 (view filing) | Oct 27 | 2 days | Malecek Michael JSee Remarks | SSaleOrdinary Shares, par value $0.01 per share | −10.0K | $58.52 | −$585.2K | −100.0%0 after | 4 lots |
| Oct 22, 2021 (view filing) | Oct 20 | 2 days | Walker Karin LChief Accounting Officer | SSaleOrdinary Shares, par value $0.01 per share | −23.0K | $60.25 | −$1.39M | −100.0%0 after | 3 lots |
| Oct 1, 2021 (view filing) | Oct 1 | Same day | Selkoe Dennis J.Director | SSaleOrdinary Shares, par value $0.01 per share | −5.00K | $67.83 | −$339.2K | −63.7%2.85K after | 4 lots |
| Oct 1, 2021 (view filing) | Oct 1 | Same day | Karp Carol D.Chief Regulatory Officer | SSaleOrdinary Shares, par value $0.01 per share | −10.0K | $68.24 | −$682.4K | −100.0%0 after | 5 lots |
| Sep 10, 2021 (view filing) | Sep 9 | 1 day | Karp Carol D.Chief Regulatory Officer | SSaleOrdinary Shares, par value $0.01 per share | −10.0K | $71.99 | −$719.9K | −100.0%0 after | 2 lots |
| Jul 30, 2021 (view filing) | Jul 30 | Same day | Selkoe Dennis J.Director | SSaleOrdinary Shares, par value $0.01 per share | −5.00K | $49.47 | −$247.4K | −63.7%2.85K after | 2 lots |
| Jul 16, 2021 (view filing) | Jul 14 | 2 days | Henney Christopher SDirector | SSaleOrdinary Shares, par value $0.01 per share | −11.1K | $55.46 | −$616.0K | −100.0%0 after | 2 lots |
| Jul 13, 2021 (view filing) | Jul 12 | 1 day | Henney Christopher SDirector | SSaleOrdinary Shares, par value $0.01 per share | −23.9K | $55.50 | −$1.33M | −100.0%0 after | Amended13 lots |