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Prothena Corporation plc

PRTA
Healthcare|Biotechnology|IE
$7.97
+0.08 (+1.01%)
DCF Value
$3.58
Tangible Book / Share
$5.23
Cash / Share
$5.28

Ownership Breakdown

85.5%
Float
51.3M
Shares Outstanding
43.9M
Float Shares

Major Holders (17)

Combined: 104.8%

Holders of 5%+ from their latest Schedule 13D/13G filing in the last two years. Percentages are as of each filing date.

HolderType% of ClassSharesFiledFiling
FMR LLCHolding company13.80%7,199,218Aug 6, 202613D/G
Abigail P. JohnsonIndividual13.80%7,199,218Aug 6, 202613D/G
Scully William PIndividual10.30%5,378,846May 11, 202613D/G
Fennell Todd W.Individual10.20%5,248,846Aug 19, 202613D/G
Wellington Management Company LLPInvestment adviser9.50%5,130,876Feb 10, 202513D/G
Rubric Capital Management LPIA, PN9.29%5,000,000May 15, 202613D/G
David RosenHC, IN9.29%5,000,000May 15, 202613D/G
William P. ScullyIndividual7.50%4,036,140Nov 13, 202413D/G
BlackRock, Inc.Holding company6.90%3,587,480Jul 29, 202613D/G
Todd W. FennellIndividual5.89%3,168,827Nov 13, 202413D/G
ADAR1 Capital Management, LLCIA, OO2.70%1,469,098Nov 14, 202513D/G
Daniel SchneebergerHC, IN2.70%1,469,098Nov 14, 202513D/G
ADAR1 Capital Management GP, LLCOther2.20%1,189,587Nov 14, 202513D/G
Wellington Group Holdings LLPHolding company0.20%108,208Jun 5, 202513D/G
Wellington Management Group LLPHolding company0.20%108,208Jun 5, 202513D/G
Wellington Investment Advisors Holdings LLPHolding company0.20%108,208Jun 5, 202513D/G
T. Rowe Price Associates, Inc.Investment adviser0.10%71,047Aug 14, 202513D/G

Insider Trades (100)

Last 4 quarters: 4,811,997 acquired · 1,642,060 disposed
InsiderPositionDateTypeSharesPriceValueFiling
SCULLY WILLIAM P10 percent ownerOct 27, 2026GIFT566,444——Form 4
SCULLY WILLIAM P10 percent ownerOct 23, 2026BUY50,000$8.07$403.5KForm 4
SCULLY WILLIAM P10 percent ownerOct 22, 2026BUY100,000$8.19$818.5KForm 4
SCULLY WILLIAM P10 percent ownerOct 14, 2026BUY10,000$8.46$84.6KForm 4
SCULLY WILLIAM P10 percent ownerOct 13, 2026BUY100,000$8.35$835.5KForm 4
SCULLY WILLIAM P10 percent ownerOct 8, 2026BUY90,000$8.57$770.9KForm 4
SCULLY WILLIAM P10 percent ownerOct 7, 2026BUY125,000$8.40$1.1MForm 4
SCULLY WILLIAM P10 percent ownerOct 2, 2026BUY100,000$8.57$857.2KForm 4
SCULLY WILLIAM P10 percent ownerSep 29, 2026BUY162,000$8.68$1.4MForm 4
SCULLY WILLIAM P10 percent ownerSep 28, 2026BUY103,500$8.60$889.9KForm 4
SCULLY WILLIAM P10 percent ownerSep 18, 2026BUY100,000$8.43$843.5KForm 4
SCULLY WILLIAM P10 percent ownerSep 2, 2026BUY27,000$9.47$255.7KForm 4
SCULLY WILLIAM P10 percent ownerAug 20, 2026BUY50,000$8.79$439.4KForm 4
Fennell Todd W.10 percent owner: Aug 18, 2026OTHER0——Form 4
SCULLY WILLIAM P10 percent ownerAug 17, 2026GIFT336,000——Form 4
SCULLY WILLIAM P10 percent ownerAug 18, 2026GIFT627,553——Form 4
SCULLY WILLIAM P10 percent ownerAug 10, 2026GIFT251,553——Form 4
Fennell Todd W.10 percent owner: Aug 6, 2026OTHER0——Form 4
SCULLY WILLIAM P10 percent ownerAug 7, 2026BUY34,000$8.62$293.1KForm 4
SCULLY WILLIAM P10 percent ownerAug 7, 2026BUY3,500$8.62$30.2KForm 4
Zago Wagner M.Chief Scientific OfficerJul 28, 2026OPTION EX.51,000——Form 4
Zago Wagner M.Chief Scientific OfficerJul 28, 2026DISPOSED51,000$8.56$436.6KForm 4
Zago Wagner M.Chief Scientific OfficerJul 28, 2026OPTION EX.51,000——Form 4
Walker Karin LChief Accounting OfficerJul 28, 2026OPTION EX.15,000——Form 4
Walker Karin LChief Accounting OfficerJul 28, 2026DISPOSED15,000$8.56$128.4KForm 4
Walker Karin LChief Accounting OfficerJul 28, 2026OPTION EX.15,000——Form 4
Swanson Chad J.Chief Development OfficerJul 28, 2026OPTION EX.51,000——Form 4
Swanson Chad J.Chief Development OfficerJul 28, 2026DISPOSED40,800$8.56$349.2KForm 4
Swanson Chad J.Chief Development OfficerJul 28, 2026TAX W/H3,467$8.56$29.7KForm 4
Swanson Chad J.Chief Development OfficerJul 28, 2026OPTION EX.51,000——Form 4
Smith Brandon S.Chief Operating OfficerJul 28, 2026OPTION EX.78,000——Form 4
Smith Brandon S.Chief Operating OfficerJul 28, 2026DISPOSED78,000$8.56$667.7KForm 4
Smith Brandon S.Chief Operating OfficerJul 28, 2026OPTION EX.78,000——Form 4
Nguyen TranChief Strategy Officer and CFOJul 28, 2026OPTION EX.57,000——Form 4
Nguyen TranChief Strategy Officer and CFOJul 28, 2026DISPOSED57,000$8.56$487.9KForm 4
Nguyen TranChief Strategy Officer and CFOJul 28, 2026OPTION EX.57,000——Form 4
Kinney Gene G.director, officer: President and CEOJul 28, 2026OPTION EX.84,000——Form 4
Kinney Gene G.director, officer: President and CEOJul 28, 2026DISPOSED84,000$8.56$719.0KForm 4
Kinney Gene G.director, officer: President and CEOJul 28, 2026OPTION EX.84,000——Form 4
Kingston Anne EvansChief Strategy OfficerJul 28, 2026TAX W/H3,498$8.56$29.9KForm 4
Kingston Anne EvansChief Strategy OfficerJul 29, 2026SELL7,662$8.47$64.9KForm 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jul 28, 2026TAX W/H4,694$8.56$40.2KForm 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jul 29, 2026SELL8,386$8.47$71.1KForm 4
SCULLY WILLIAM P10 percent ownerJun 16, 2026BUY20,000$7.90$158.0KForm 4
SCULLY WILLIAM P10 percent ownerJun 15, 2026GIFT325,000——Form 4
SCULLY WILLIAM P10 percent ownerJun 11, 2026BUY125,000$8.17$1.0MForm 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jun 8, 2026OTHER0——Form 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jun 8, 2026OTHER17,500$10.99$192.3KForm 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jun 8, 2026OTHER10,000$22.60$226.0KForm 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jun 8, 2026OTHER8,250$32.45$267.7KForm 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jun 8, 2026OTHER8,800$52.97$466.1KForm 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jun 8, 2026OTHER12,000$30.30$363.6KForm 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jun 8, 2026OTHER8,612$14.95$128.7KForm 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jun 8, 2026OTHER37,500$9.36$351.0KForm 4
Isaacs Michael JohnGeneral Counsel & Company Sec.Jun 8, 2026OTHER50,000$10.50$525.0KForm 4
SCULLY WILLIAM P10 percent ownerJun 4, 2026BUY50,000$9.31$465.3KForm 4
SCULLY WILLIAM P10 percent ownerJun 2, 2026BUY50,000$9.43$471.3KForm 4
SCULLY WILLIAM P10 percent ownerMay 22, 2026BUY100,000$9.81$981.3KForm 4
WELCH DANIEL GdirectorMay 15, 2026AWARD27,000$9.76$263.5KForm 4
Selkoe Dennis J.directorMay 15, 2026AWARD27,000$9.76$263.5KForm 4
Ekman LarsdirectorMay 15, 2026AWARD27,000$9.76$263.5KForm 4
Dunn William H. Jr.directorMay 15, 2026AWARD27,000$9.76$263.5KForm 4
Cooke ShanedirectorMay 15, 2026AWARD27,000$9.76$263.5KForm 4
COLLIER RICHARD TdirectorMay 15, 2026AWARD27,000$9.76$263.5KForm 4
SCULLY WILLIAM P10 percent ownerMay 7, 2026OTHER0——Form 4
SCULLY WILLIAM P10 percent ownerMay 7, 2026OTHER0——Form 4
SCULLY WILLIAM P10 percent ownerMay 7, 2026OTHER0——Form 4
Kingston Anne EvansChief Strategy OfficerApr 10, 2026AWARD100,000$10.50$1.1MForm 4
Kingston Anne EvansChief Strategy OfficerApr 10, 2026OTHER0——Form 4
Kingston Anne EvansChief Strategy OfficerApr 10, 2026OTHER5,000$53.81$269.1KForm 4
Kingston Anne EvansChief Strategy OfficerApr 10, 2026OTHER3,000$30.30$90.9KForm 4
Kingston Anne EvansChief Strategy OfficerApr 10, 2026OTHER14,080$14.95$210.5KForm 4
Zago Wagner M.Chief Scientific OfficerMar 3, 2026AWARD190,000$9.36$1.8MForm 4
Walker Karin LChief Accounting OfficerMar 3, 2026AWARD150,000$9.36$1.4MForm 4
Swanson Chad J.Chief Development OfficerMar 3, 2026AWARD190,000$9.36$1.8MForm 4
Smith Brandon S.Chief Operating OfficerMar 3, 2026AWARD190,000$9.36$1.8MForm 4
Nguyen TranChief Strategy Officer and CFOMar 3, 2026AWARD230,000$9.36$2.2MForm 4
Malecek Michael JChief Legal OfficerMar 3, 2026AWARD190,000$9.36$1.8MForm 4
Kinney Gene G.director, officer: President and CEOMar 3, 2026AWARD520,000$9.36$4.9MForm 4
Zago Wagner M.Chief Scientific OfficerJul 28, 2025AWARD85,000——Form 4
Walker Karin LChief Accounting OfficerJul 28, 2025AWARD25,000——Form 4
Swanson Chad J.Chief Development OfficerJul 28, 2025AWARD85,000——Form 4
Smith Brandon S.Chief Operating OfficerJul 28, 2025AWARD130,000——Form 4
Nguyen TranChief Strategy Officer and CFOJul 28, 2025AWARD95,000——Form 4
Malecek Michael JChief Legal OfficerJul 28, 2025AWARD80,000——Form 4
Kinney Gene G.director, officer: President and CEOJul 28, 2025AWARD140,000——Form 4
WELCH DANIEL GdirectorMay 14, 2025AWARD20,183$6.88$139.0KForm 4
Selkoe Dennis J.directorMay 14, 2025AWARD20,183$6.88$139.0KForm 4
Kim Helen SusandirectorMay 14, 2025AWARD20,183$6.88$139.0KForm 4
Ekman LarsdirectorMay 14, 2025AWARD20,183$6.88$139.0KForm 4
Dunn William H. Jr.directorMay 14, 2025AWARD20,183$6.88$139.0KForm 4
Cooke ShanedirectorMay 14, 2025AWARD20,183$6.88$139.0KForm 4
COLLIER RICHARD TdirectorMay 14, 2025AWARD20,183$6.88$139.0KForm 4
Cobb Paula KdirectorMay 14, 2025AWARD20,183$6.88$139.0KForm 4
EcoR1 Capital, LLC10 percent ownerMay 2, 2025SELL3,317,938$8.36$27.7MForm 4
EcoR1 Capital, LLC10 percent ownerMay 5, 2025SELL977,693$8.11$7.9MForm 4
EcoR1 Capital, LLC10 percent ownerMay 6, 2025SELL1,984,053$7.64$15.2MForm 4
SCULLY WILLIAM P10 percent ownerDec 18, 2024BUY73,436$13.93$1.0MForm 4
SCULLY WILLIAM P10 percent ownerDec 18, 2024GIFT430,000——Form 4
SCULLY WILLIAM P10 percent ownerJan 14, 2025BUY100,000$12.79$1.3MForm 4