Prothena Corp Public Ltd Co (PRTA) insider trading
Every open-market stock purchase and sale by Prothena Corp Public Ltd Co executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- William P Scully (10% owner) bought $7.8M in the last 90 days, more than doubling their stake.
- Michael John Isaacs (General Counsel) and 1 other sold $136K in the last 90 days.
Last 12 months: insiders bought $10.9M (14 buys) and sold $136K (2 sales). Last close $8.03 on Oct 21, 2026.
Recent PRTA insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Oct 14, 2026 | William P Scully (10% owner) | Bought | $84.6K |
| Oct 13, 2026 | William P Scully (10% owner) | Bought | $835K |
| Oct 8, 2026 | William P Scully (10% owner) | Bought | $771K |
| Oct 7, 2026 | William P Scully (10% owner) | Bought | $1.1M |
| Oct 2, 2026 | William P Scully (10% owner) | Bought | $857K |
| Sep 29, 2026 | William P Scully (10% owner) | Bought | $1.4M |
| Sep 28, 2026 | William P Scully (10% owner) | Bought | $890K |
| Sep 18, 2026 | William P Scully (10% owner) | Bought | $843K |
| Sep 2, 2026 | William P Scully (10% owner) | Bought | $256K |
| Aug 20, 2026 | William P Scully (10% owner) | Bought | $439K |
| Aug 18, 2026 | William P Scully (10% owner) | Sold (not open market) | — |
| Aug 17, 2026 | William P Scully (10% owner) | Bought (not open market) | — |
| Aug 10, 2026 | William P Scully (10% owner) | Bought (not open market) | — |
| Aug 7, 2026 | William P Scully (10% owner) | Bought | $293K |
| Aug 7, 2026 | William P Scully (10% owner) | Bought | $30.2K |
| Jul 29, 2026 | Michael John Isaacs (General Counsel) | Sold | $71.1K |
| Jul 29, 2026 | Anne Evans Kingston (C-suite exec) | Sold | $64.9K |
| Jul 28, 2026 | Gene G. Kinney (CEO) | Sold (not open market) | $719K |
| Jul 28, 2026 | Brandon S. Smith (COO) | Sold (not open market) | $668K |
| Jul 28, 2026 | Tran Nguyen (CFO) | Sold (not open market) | $488K |
| Jul 28, 2026 | Wagner M. Zago (C-suite exec) | Sold (not open market) | $437K |
| Jul 28, 2026 | Chad J. Swanson (C-suite exec) | Sold (not open market) | $349K |
| Jul 28, 2026 | Karin L Walker (C-suite exec) | Sold (not open market) | $128K |
| Jul 28, 2026 | Michael John Isaacs (General Counsel) | Sold (not open market) | $40.2K |
| Jul 28, 2026 | Anne Evans Kingston (C-suite exec) | Sold (not open market) | $29.9K |
Who's trading PRTA
- William P Scully, 10% owner: bought $10.9M (17 buys), last Oct 14, 2026
- Michael John Isaacs, General Counsel: sold $71.1K (1 sale), last Jul 29, 2026
- Anne Evans Kingston, C-suite exec: sold $64.9K (1 sale), last Jul 29, 2026
- Wagner M. Zago, C-suite exec: other filings, last Jul 28, 2026
- Gene G. Kinney, CEO: other filings, last Jul 28, 2026
- Tran Nguyen, CFO: other filings, last Jul 28, 2026
- Brandon S. Smith, COO: other filings, last Jul 28, 2026
- Chad J. Swanson, C-suite exec: other filings, last Jul 28, 2026
- Karin L Walker, C-suite exec: other filings, last Jul 28, 2026
- Daniel G Welch, Insider: other filings, last May 15, 2026
- Lars Ekman, Insider: other filings, last May 15, 2026
- Shane Cooke, Insider: other filings, last May 15, 2026
- Dennis J. Selkoe, Insider: other filings, last May 15, 2026
- William H. Dunn Jr., Insider: other filings, last May 15, 2026
- Richard T Collier, Insider: other filings, last May 15, 2026
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