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PRTA

Prothena Corporation plc

NASDAQ · Healthcare · Biotechnology · IE

$9.82
+2.29%
Ask drillr
6
Insider buys (3m)
2
Insider sells (3m)
$2.1M
Net value (3m)
+10.4%
Price return (3m)
Form 4 filings
DateInsiderActivitySharesPrice
Sep 3, 2026SCULLY WILLIAM P · 10 percent ownerPurchase27,000$9.47
Aug 21, 2026SCULLY WILLIAM P · 10 percent ownerPurchase50,000$8.79
Aug 10, 2026SCULLY WILLIAM P · 10 percent ownerPurchase3,500$8.62
Aug 10, 2026SCULLY WILLIAM P · 10 percent ownerPurchase34,000$8.62
Jul 30, 2026Isaacs Michael John · officer: General Counsel & Company Sec.Sale8,386$8.47
Jul 30, 2026Nguyen Tran · officer: Chief Strategy Officer and CFOM-Exempt57,000$0.00
Jul 30, 2026Kinney Gene G. · director, officer: President and CEOM-Exempt84,000$0.00
Jul 30, 2026Kingston Anne Evans · officer: Chief Strategy OfficerSale7,662$8.47
Jul 30, 2026Zago Wagner M. · officer: Chief Scientific OfficerM-Exempt51,000$0.00
Jul 30, 2026Kingston Anne Evans · officer: Chief Strategy OfficerF-InKind3,498$8.56
Jul 30, 2026Swanson Chad J. · officer: Chief Development OfficerM-Exempt51,000$0.00
Jul 30, 2026Walker Karin L · officer: Chief Accounting OfficerM-Exempt15,000$0.00
Jul 30, 2026Smith Brandon S. · officer: Chief Operating OfficerM-Exempt78,000$0.00
Jul 30, 2026Isaacs Michael John · officer: General Counsel & Company Sec.F-InKind4,694$8.56
Jul 30, 2026Swanson Chad J. · officer: Chief Development OfficerF-InKind3,467$8.56
Jun 18, 2026SCULLY WILLIAM P · 10 percent ownerPurchase20,000$7.90
Jun 12, 2026SCULLY WILLIAM P · 10 percent ownerPurchase125,000$8.17
Jun 5, 2026SCULLY WILLIAM P · 10 percent ownerPurchase50,000$9.31
Jun 3, 2026SCULLY WILLIAM P · 10 percent ownerPurchase50,000$9.43
May 26, 2026SCULLY WILLIAM P · 10 percent ownerPurchase100,000$9.81
May 15, 2026WELCH DANIEL G · directorA-Award27,000$9.76
May 15, 2026COLLIER RICHARD T · directorA-Award27,000$9.76
May 15, 2026Dunn William H. Jr. · directorA-Award27,000$9.76
May 15, 2026Selkoe Dennis J. · directorA-Award27,000$9.76
May 15, 2026Cooke Shane · directorA-Award27,000$9.76
May 15, 2026Ekman Lars · directorA-Award27,000$9.76
Apr 10, 2026Kingston Anne Evans · officer: Chief Strategy OfficerA-Award100,000$11
Mar 5, 2026Zago Wagner M. · officer: Chief Scientific OfficerA-Award190,000$9.36
Mar 5, 2026Nguyen Tran · officer: Chief Strategy Officer and CFOA-Award230,000$9.36
Mar 5, 2026Malecek Michael J · officer: Chief Legal OfficerA-Award190,000$9.36
Institutional positioning

13F filings over the trailing two quarters

New 59Increased 125Reduced 113Sold out 21
FilerActionSharesFiled
FMR LLCUnchanged7,551,218May 15, 2026
FMR LLCReduced7,199,218Aug 13, 2026
RUBRIC CAPITAL MANAGEMENT LPIncreased5,000,000May 15, 2026
Rubric Capital Management LPUnchanged5,000,000Aug 14, 2026
BlackRock, Inc.Increased4,867,955Aug 7, 2026
BLACKROCK, INC.Increased4,644,160May 13, 2026
STATE STREET CORPIncreased2,393,424Aug 7, 2026
ACADIAN ASSET MANAGEMENT LLCIncreased2,010,645Aug 13, 2026
STATE STREET CORPReduced1,938,498May 15, 2026
D. E. SHAW & CO., INC.Increased1,763,347May 15, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCIncreased1,651,293Aug 13, 2026
D. E. Shaw & Co., Inc.Reduced1,611,457Aug 14, 2026
ADAR1 CAPITAL MANAGEMENT, LLCReduced1,581,443May 18, 2026
ADAR1 Capital Management, LLCReduced1,554,535Aug 14, 2026
ACADIAN ASSET MANAGEMENT LLCIncreased1,547,593May 13, 2026

Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing Sep 3, 2026