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 |
|---|---|---|---|---|---|---|---|---|---|
| Jan 24, 2024 (view filing) | Jan 24 | Same day | Walker Karin LChief Accounting Officer | SSaleOrdinary Shares, par value $0.01 per share | −5.00K | $34.00 | −$170.0K | −100.0%0 after | 10b5-1 |
| May 2, 2025 (view filing) | Dec 18, 2024-Jan 14, 2025 | 135 daysLate | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +207.4K | $13.26 | +$2.75M | +39.2%736.0K after | 6 lots |
| May 6, 2025 (view filing) | May 2-6 | 4 days | EcoR1 Capital, LLC10% Owner | SSale | −6.28M | $8.09 | −$50.8M | −54.2%5.30M after | 3 lots |
| May 26, 2026 (view filing) | May 22 | 4 days | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +100.0K | $9.81 | +$981.0K | +13.6%836.0K after | |
| Jun 3, 2026 (view filing) | Jun 2 | 1 day | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +50.0K | $9.43 | +$471.5K | +6.0%886.0K after | |
| Jun 5, 2026 (view filing) | Jun 4 | 1 day | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +50.0K | $9.31 | +$465.5K | +5.6%936.0K after | |
| Jun 12, 2026 (view filing) | Jun 11 | 1 day | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +125.0K | $8.17 | +$1.02M | +13.4%1.06M after | |
| Jun 18, 2026 (view filing) | Jun 16 | 2 days | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +20.0K | $7.90 | +$158.0K | +2.7%756.0K after | |
| Jul 30, 2026 (view filing)8:30 PM ET | Jul 29 | 1 day | Isaacs Michael JohnGeneral Counsel & Company Sec. | SSaleOrdinary Shares, par value $0.01 per share | −8.39K | $8.47 | −$71.1K | −19.0%35.7K after | 10b5-1 |
| Jul 30, 2026 (view filing)8:31 PM ET | Jul 29 | 1 day | Kingston Anne EvansChief Strategy Officer | SSaleOrdinary Shares, par value $0.01 per share | −7.66K | $8.47 | −$64.9K | −12.1%55.8K after | 10b5-1 |
| Aug 10, 2026 (view filing)3:24 PM ET | Aug 7 | 3 days | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +34.0K | $8.62 | +$293.1K | +4.5%790.0K after | |
| Aug 10, 2026 (view filing)3:24 PM ET | Aug 7 | 3 days | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +3.50K | $8.62 | +$30.2K | +4.4%83.5K after | |
| Aug 21, 2026 (view filing)2:32 PM ET | Aug 20 | 1 day | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +50.0K | $8.79 | +$439.4K | +6.7%800.0K after | |
| Sep 3, 2026 (view filing)6:23 PM ET | Sep 2 | 1 day | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +27.0K | $9.47 | +$255.7K | +3.4%827.0K after | |
| Sep 21, 2026 (view filing)4:23 PM ET | Sep 18 | 3 days | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +100.0K | $8.43 | +$843.5K | +12.1%927.0K after |