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 $4.2M in the last 90 days, more than doubling their stake.
Last 12 months: insiders bought $7.3M (11 buys) and sold $0 (0 sales). Last close $8.68 on Sep 23, 2026.
Recent PRTA insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| 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 |
| Jun 16, 2026 | William P Scully (10% owner) | Bought | $158K |
| Jun 15, 2026 | William P Scully (10% owner) | Sold (not open market) | — |
| Jun 11, 2026 | William P Scully (10% owner) | Bought | $1M |
| Jun 4, 2026 | William P Scully (10% owner) | Bought | $465K |
| Jun 2, 2026 | William P Scully (10% owner) | Bought | $471K |
| May 22, 2026 | William P Scully (10% owner) | Bought | $981K |
| May 15, 2026 | Dennis J. Selkoe (Insider) | Bought (not open market) | — |
| May 15, 2026 | Daniel G Welch (Insider) | Bought (not open market) | — |
| May 15, 2026 | William H. Dunn Jr. (Insider) | Bought (not open market) | — |
| May 15, 2026 | Richard T Collier (Insider) | Bought (not open market) | — |
| May 15, 2026 | Lars Ekman (Insider) | Bought (not open market) | — |
| May 15, 2026 | Shane Cooke (Insider) | Bought (not open market) | — |
| Apr 10, 2026 | Anne Evans Kingston (C-suite exec) | Bought (not open market) | — |
| Mar 3, 2026 | Wagner M. Zago (C-suite exec) | Bought (not open market) | — |
| Mar 3, 2026 | Chad J. Swanson (C-suite exec) | Bought (not open market) | — |
Who's trading PRTA
- William P Scully, 10% owner: bought $7.3M (12 buys), last Sep 29, 2026
- Daniel G Welch, Insider: other filings, last May 15, 2026
- Shane Cooke, Insider: other filings, last May 15, 2026
- Richard T Collier, Insider: other filings, last May 15, 2026
- Dennis J. Selkoe, Insider: other filings, last May 15, 2026
- Lars Ekman, Insider: other filings, last May 15, 2026
- William H. Dunn Jr., Insider: other filings, last May 15, 2026
- Anne Evans Kingston, C-suite exec: other filings, last Apr 10, 2026
- Chad J. Swanson, C-suite exec: other filings, last Mar 3, 2026
- Karin L Walker, C-suite exec: other filings, last Mar 3, 2026
- Wagner M. Zago, C-suite exec: other filings, last Mar 3, 2026
- Gene G. Kinney, CEO: other filings, last Mar 3, 2026
- Michael J Malecek, C-suite exec: other filings, last Mar 3, 2026
- Tran Nguyen, CFO: other filings, last Mar 3, 2026
- Brandon S. Smith, COO: other filings, last Mar 3, 2026
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