PRTA
Prothena Corporation plc
NASDAQ · Healthcare · Biotechnology · IE
$9.82
+2.29%6
Insider buys (3m)
2
Insider sells (3m)
$2.1M
Net value (3m)
+10.4%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| Sep 3, 2026 | SCULLY WILLIAM P · 10 percent owner | Purchase | 27,000 | $9.47 |
| Aug 21, 2026 | SCULLY WILLIAM P · 10 percent owner | Purchase | 50,000 | $8.79 |
| Aug 10, 2026 | SCULLY WILLIAM P · 10 percent owner | Purchase | 3,500 | $8.62 |
| Aug 10, 2026 | SCULLY WILLIAM P · 10 percent owner | Purchase | 34,000 | $8.62 |
| Jul 30, 2026 | Isaacs Michael John · officer: General Counsel & Company Sec. | Sale | 8,386 | $8.47 |
| Jul 30, 2026 | Nguyen Tran · officer: Chief Strategy Officer and CFO | M-Exempt | 57,000 | $0.00 |
| Jul 30, 2026 | Kinney Gene G. · director, officer: President and CEO | M-Exempt | 84,000 | $0.00 |
| Jul 30, 2026 | Kingston Anne Evans · officer: Chief Strategy Officer | Sale | 7,662 | $8.47 |
| Jul 30, 2026 | Zago Wagner M. · officer: Chief Scientific Officer | M-Exempt | 51,000 | $0.00 |
| Jul 30, 2026 | Kingston Anne Evans · officer: Chief Strategy Officer | F-InKind | 3,498 | $8.56 |
| Jul 30, 2026 | Swanson Chad J. · officer: Chief Development Officer | M-Exempt | 51,000 | $0.00 |
| Jul 30, 2026 | Walker Karin L · officer: Chief Accounting Officer | M-Exempt | 15,000 | $0.00 |
| Jul 30, 2026 | Smith Brandon S. · officer: Chief Operating Officer | M-Exempt | 78,000 | $0.00 |
| Jul 30, 2026 | Isaacs Michael John · officer: General Counsel & Company Sec. | F-InKind | 4,694 | $8.56 |
| Jul 30, 2026 | Swanson Chad J. · officer: Chief Development Officer | F-InKind | 3,467 | $8.56 |
| Jun 18, 2026 | SCULLY WILLIAM P · 10 percent owner | Purchase | 20,000 | $7.90 |
| Jun 12, 2026 | SCULLY WILLIAM P · 10 percent owner | Purchase | 125,000 | $8.17 |
| Jun 5, 2026 | SCULLY WILLIAM P · 10 percent owner | Purchase | 50,000 | $9.31 |
| Jun 3, 2026 | SCULLY WILLIAM P · 10 percent owner | Purchase | 50,000 | $9.43 |
| May 26, 2026 | SCULLY WILLIAM P · 10 percent owner | Purchase | 100,000 | $9.81 |
| May 15, 2026 | WELCH DANIEL G · director | A-Award | 27,000 | $9.76 |
| May 15, 2026 | COLLIER RICHARD T · director | A-Award | 27,000 | $9.76 |
| May 15, 2026 | Dunn William H. Jr. · director | A-Award | 27,000 | $9.76 |
| May 15, 2026 | Selkoe Dennis J. · director | A-Award | 27,000 | $9.76 |
| May 15, 2026 | Cooke Shane · director | A-Award | 27,000 | $9.76 |
| May 15, 2026 | Ekman Lars · director | A-Award | 27,000 | $9.76 |
| Apr 10, 2026 | Kingston Anne Evans · officer: Chief Strategy Officer | A-Award | 100,000 | $11 |
| Mar 5, 2026 | Zago Wagner M. · officer: Chief Scientific Officer | A-Award | 190,000 | $9.36 |
| Mar 5, 2026 | Nguyen Tran · officer: Chief Strategy Officer and CFO | A-Award | 230,000 | $9.36 |
| Mar 5, 2026 | Malecek Michael J · officer: Chief Legal Officer | A-Award | 190,000 | $9.36 |
Institutional positioning
13F filings over the trailing two quarters
New 59Increased 125Reduced 113Sold out 21
| Filer | Action | Shares | Filed |
|---|---|---|---|
| FMR LLC | Unchanged | 7,551,218 | May 15, 2026 |
| FMR LLC | Reduced | 7,199,218 | Aug 13, 2026 |
| RUBRIC CAPITAL MANAGEMENT LP | Increased | 5,000,000 | May 15, 2026 |
| Rubric Capital Management LP | Unchanged | 5,000,000 | Aug 14, 2026 |
| BlackRock, Inc. | Increased | 4,867,955 | Aug 7, 2026 |
| BLACKROCK, INC. | Increased | 4,644,160 | May 13, 2026 |
| STATE STREET CORP | Increased | 2,393,424 | Aug 7, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 2,010,645 | Aug 13, 2026 |
| STATE STREET CORP | Reduced | 1,938,498 | May 15, 2026 |
| D. E. SHAW & CO., INC. | Increased | 1,763,347 | May 15, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 1,651,293 | Aug 13, 2026 |
| D. E. Shaw & Co., Inc. | Reduced | 1,611,457 | Aug 14, 2026 |
| ADAR1 CAPITAL MANAGEMENT, LLC | Reduced | 1,581,443 | May 18, 2026 |
| ADAR1 Capital Management, LLC | Reduced | 1,554,535 | Aug 14, 2026 |
| ACADIAN ASSET MANAGEMENT LLC | Increased | 1,547,593 | May 13, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Sep 3, 2026