Companies / Prothena Corp Public Ltd Co

Prothena Corp Public Ltd Co

Nasdaq: PRTAForeign · IFRSCIK 1559053DUBLIN 2

Financials · FY2025

Revenue$9.68M
Net income$-244.09M
Total debt—
Cash$288.19M
Diluted EPS$-4.53
Shares outstanding51.3M

Ownership

51.3M shares outstanding · as of Jul 30, 2026
97.4%Institutions
Ownership
Institutions97.38%49,990,028
Public float2.62%1,346,946

% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.

Insiders 11

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Insider% of sharesShares
Collier Richard TDirector
——
Ekman LarsDirector
——
Kinney Gene G.CEOPresident and CEO · Director
——
Malecek Michael JChief Legal Officer
——
Nguyen TranChief Strategy Officer and CFO
——
Scully William P10% owner
——
Smith Brandon S.Chief Operating Officer
——
Swanson Chad J.Chief Development Officer
——
Walker Karin LChief Accounting Officer
——
Welch Daniel GDirector
——

Institutional holders 188

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HolderValue% of shares
Fmr LLC$72.11M14.71%
BlackRock, Inc.$47.66M9.48%
Rubric Capital Management LP$35.12M7.16%
State Street Corporation$23.43M4.66%
Vanguard Group Inc$20.45M4.17%
D. E. Shaw & Co., Inc.$17.14M3.43%
Armistice Capital, LLC$14.32M2.92%
ADAR1 Capital Management, LLC$13.92M2.84%
Morgan Stanley$11.91M2.43%
Palo Alto Investors LP$11.75M2.35%

Activity

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InsidersInstitutions
What insiders are doing in this stock (Form 4).
DateActorActionSecurityValueShares ΔPosition afterImpact
Jun 11, 2026Scully William P
10% owner
BuyOrdinary Shares, par value $0.01 per share$1.02M+125K
+13.35%
1,061,000
2.07% of shares
high
May 22, 2026Scully William P
10% owner
BuyOrdinary Shares, par value $0.01 per share$981.3K+100K
+13.59%
836,000
1.63% of shares
high
Jun 2, 2026Scully William P
10% owner
BuyOrdinary Shares, par value $0.01 per share$471.3K+50K
+5.98%
886,000
1.73% of shares
high
Jun 4, 2026Scully William P
10% owner
BuyOrdinary Shares, par value $0.01 per share$465.3K+50K
+5.64%
936,000
1.82% of shares
high
Jun 16, 2026Scully William P
10% owner
BuyOrdinary Shares, par value $0.01 per share$158.0K+20K
+2.72%
756,000
1.47% of shares
medium
Jun 15, 2026Scully William P
10% owner
GiftOrdinary Shares, par value $0.01 per share$0-325K
-30.63%
736,000
1.43% of shares
low
May 15, 2026Ekman Lars
Director
GrantStock Option (Right to Buy)—+27K
27,000
0.05% of shares
low
May 15, 2026Welch Daniel G
Director
GrantStock Option (Right to Buy)—+27K
27,000
0.05% of shares
low

5%+ ownership events

Schedule 13D / 13G
FilerStance% of classSharesDate
Rubric Capital Management LPPassive13G———
Scully William PPassive13G/A———

Securities

via CUSIP / OpenFIGI
SymbolTypeMarketCUSIPFIGI
PRTA——G72800108—