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Prothena Corporation plc 2025-2026 Proxy Voting Records

Compiled from SEC Form N-PX filings and Prothena Corporation plc’s Form 8-K, filed May 15, 2026 (Item 5.07 on EDGAR). Page generated October 18, 2026.

  • 5Ballot items
  • 218Asset managers
  • 1,085Fund votes
  • May 14, 2026Main meeting date

Results at a glance

Meeting of May 14, 2026: 4 items on Prothena Corporation plc’s Form 8-K, filed May 15, 2026: 2 elected · 2 approved.

Meeting of November 19, 2025: 1 item on Prothena Corporation plc’s Form 8-K, filed November 19, 2025: 1 approved.

Material dissent

Material dissent: a director nominee under 80% of the votes cast, say-on-pay under 70%, any other item the board put forward under 80%, or a shareholder proposal with more than 50%, on the company’s own Form 8-K tally. How this is decided

Proxy season: 2023-2024 2024-2025 2025-2026

Explore Prothena Corporation plc in the interactive database Compare manager voting policies

Official 2025-2026 meeting results reported by Prothena Corporation plc

These tallies are Prothena Corporation plc’s own, as disclosed to the U.S. Securities and Exchange Commission on Form 8-K, filed May 15, 2026 (Item 5.07, “Submission of Matters to a Vote of Security Holders”). They cover every share voted at the meeting, not just the funds that file Form N-PX. Prothena Corporation plc reported 2 meetings in this season; each is tabulated separately below, with its own filing.

Prothena Corporation plc — official shareholder meeting results, meeting held May 14, 2026 (Form 8-K, filed May 15, 2026)
Ballot itemForAgainst AbstainWithheldBroker non-votesSupport (of votes cast)Reported outcomeVoting standard
Elect Director: Shane M. Cooke 22,720,76911,923,4679,139 --7,374,142 66%Elected—
Elect Director: Dennis J. Selkoe 25,226,5609,420,5446,271 --7,374,142 73%Elected—
2. Ratification of Appointment of the Company's Independent Registered Public Accounting Firm for 2026 and Authorization of the Board of Directors to Approve the Remuneration of that Auditor 41,931,71882,81512,984 ---- 99.8%Approved—
3. Approval of Compensation of the Company's Named Executive Officers 32,303,0761,145,4001,204,899 --7,374,142 97%Approved—

Source: Prothena Corporation plc, Form 8-K, filed with the SEC on May 15, 2026 — read the filing on EDGAR.

Prothena Corporation plc — official shareholder meeting results, meeting held November 19, 2025 (Form 8-K, filed November 19, 2025)
Ballot itemForAgainst AbstainWithheldBroker non-votesSupport (of votes cast)Reported outcomeVoting standard
1. Approval of a Reduction of the Company's Capital to Create Distributable Reserves 37,779,05246,73845,906 ---- 99.8%Approved—

Source: Prothena Corporation plc, Form 8-K, filed with the SEC on November 19, 2025 — read the filing on EDGAR.

How asset managers voted at the Prothena Corporation plc 2025-2026 meetings

Each item below shows how the 218 asset managers that disclosed a Prothena Corporation plc vote in their SEC Form N-PX filings actually voted. Share totals are the shares those managers' funds voted, summed across every fund they report.

1. Elect Director: Shane M. Cooke

Official resultDIRECTOR ELECTIONSReported outcome: Elected

Meeting held May 14, 2026.

Combines 4 wordings of this item as funds reported it.

66% Majority: yes · of votes cast

FOR 66%AGAINST
FOR: 22,720,769AGAINST: 11,923,467
Details: description as filed, official tally, votes by 52 asset managers

Description as filed by funds: To elect, by separate resolutions, two directors to hold office until no later than the Annual General Meeting of the Company's Shareholders in 2029, unless they resign, are removed from office, or are otherwise disqualified from serving as directors of the Company: Shane M. Cooke

Prothena Corporation plc’s own tally for this item (“Elect Director: Shane M. Cooke”): 22,720,769 for, 11,923,467 against, per its Form 8-K filed May 15, 2026 (Item 5.07). FOR was more than half of the votes cast. Whether the item passed is for the filing to say; its statement has not been read for this item.

Reported outcome: Elected, in the filing’s own words: “The shareholders re-elected the following individuals to the Company's Board of Directors to hold office until no later than the annual general meeting of shareholders in 2029.”
Support: 66% of votes cast — FOR ÷ (FOR + AGAINST); abstentions and broker non-votes are excluded.

The 52 asset managers below reported 6,851,394 for, 6,250,007 against.

FORAGAINST
FOR: 6,851,394AGAINST: 6,250,007
Largest asset managers voting on “To elect, by separate resolutions, two directors to hold office until no later than the Annual General Meeting” at Prothena Corporation plc, 2025-2026
Asset managerForAgainst AbstainWithheldVote
Fidelity535,3813,894,973 00Mixed
BlackRock2,176,3270 00For
Vanguard1,908,8744,420 00For
State Street01,345,028 00Against
TIAA0755,110 00Against
Federated Hermes728,4220 00For
Charles Schwab362,1880 00For
Bridge Builder Trust220,5920 00For
Nationwide150,0070 00For
Equitable61,79849,840 00Mixed
MFS0111,437 00Against
Columbia Threadneedle82,4220 00For
American Century79,6850 00For
QUANTITATIVE MASTER SERIES LLC66,0280 00For
GuideStone60,6420 00For
Direxion Shares ETF Trust57,7990 00For
Goldman Sachs48,2100 00For
ProShares41,1900 00For
CLEARWATER INVESTMENT TRUST38,3310 00For
Lincoln Financial2,05532,445 00Mixed
MASTER INVESTMENT PORTFOLIO29,4270 00For
ETFis Series Trust I27,1940 00For
Russell Investments25,3680 00For
Northern Trust023,852 00Against
AIG/SunAmerica22,0230 00For

Showing the 25 largest of 52 asset managers. See all 52 in the interactive database.

2. Elect Director: Dennis J. Selkoe

Official resultDIRECTOR ELECTIONSReported outcome: Elected

Meeting held May 14, 2026.

Combines 4 wordings of this item as funds reported it.

73% Majority: yes · of votes cast

FOR 73%AGAINST
FOR: 25,226,560AGAINST: 9,420,544
Details: description as filed, official tally, votes by 52 asset managers

Description as filed by funds: To elect, by separate resolutions, two directors to hold office until no later than the Annual General Meeting of the Company's Shareholders in 2029, unless they resign, are removed from office, or are otherwise disqualified from serving as directors of the Company: Dennis J. Selkoe

Prothena Corporation plc’s own tally for this item (“Elect Director: Dennis J. Selkoe”): 25,226,560 for, 9,420,544 against, per its Form 8-K filed May 15, 2026 (Item 5.07). FOR was more than half of the votes cast. Whether the item passed is for the filing to say; its statement has not been read for this item.

Reported outcome: Elected, in the filing’s own words: “The shareholders re-elected the following individuals to the Company's Board of Directors to hold office until no later than the annual general meeting of shareholders in 2029.”
Support: 73% of votes cast — FOR ÷ (FOR + AGAINST); abstentions and broker non-votes are excluded.

The 52 asset managers below reported 8,251,362 for, 4,850,039 against.

FORAGAINST
FOR: 8,251,362AGAINST: 4,850,039
Largest asset managers voting on “To elect, by separate resolutions, two directors to hold office until no later than the Annual General Meeting” at Prothena Corporation plc, 2025-2026
Asset managerForAgainst AbstainWithheldVote
Fidelity535,3813,894,973 00Mixed
BlackRock2,176,3270 00For
Vanguard1,910,2303,064 00For
State Street1,345,0280 00For
TIAA0755,110 00Against
Federated Hermes728,4220 00For
Charles Schwab362,1880 00For
Bridge Builder Trust220,5920 00For
Nationwide150,0070 00For
Equitable61,79849,840 00Mixed
MFS0111,437 00Against
Columbia Threadneedle82,4220 00For
American Century79,6850 00For
QUANTITATIVE MASTER SERIES LLC66,0280 00For
GuideStone60,6420 00For
Direxion Shares ETF Trust57,7990 00For
Goldman Sachs48,2100 00For
ProShares41,1900 00For
CLEARWATER INVESTMENT TRUST38,3310 00For
Lincoln Financial29,6554,845 00Mixed
MASTER INVESTMENT PORTFOLIO29,4270 00For
ETFis Series Trust I27,1940 00For
Russell Investments25,3680 00For
Northern Trust23,8520 00For
AIG/SunAmerica22,0230 00For

Showing the 25 largest of 52 asset managers. See all 52 in the interactive database.

3. 1. Approval of a Reduction of the Company's Capital to Create Distributable Reserves

Official resultCAPITAL STRUCTUREReported outcome: Approved

Meeting held November 19, 2025.

Combines 3 wordings of this item as funds reported it.

99.8% Approved · of votes cast

FOR 99.8%
FOR: 37,779,052AGAINST: 46,738
Details: description as filed, official tally, votes by 56 asset managers

Description as filed by funds: To approve a reduction in the Company's capital to create distributable reserves.

Prothena Corporation plc’s own tally for this item (“1. Approval of a Reduction of the Company's Capital to Create Distributable Reserves”): 37,779,052 for, 46,738 against — passed, per its Form 8-K filed November 19, 2025 (Item 5.07).

Reported outcome: Approved, in the filing’s own words: “The shareholders approved a reduction of the Company's capital to create distributable reserves.”
Support: 99.8% of votes cast — FOR ÷ (FOR + AGAINST); abstentions and broker non-votes are excluded.

The 56 asset managers below reported 12,626,489 for, 8,334 abstained.

FOR
FOR: 12,626,489ABSTAIN: 8,334
Largest asset managers voting on “To approve a reduction in the Company's capital to create distributable reserves.” at Prothena Corporation plc, 2025-2026
Asset managerForAgainst AbstainWithheldVote
Fidelity5,445,0460 00For
Vanguard1,822,8870 00For
BlackRock1,789,4270 00For
Federated Hermes659,0560 00For
TIAA623,9110 00For
Dimensional364,4550 00For
Charles Schwab351,0050 00For
Exchange Place Advisors Trust202,7550 00For
JPMorgan173,1250 00For
Nationwide118,6220 00For
Equitable111,6380 00For
Columbia Threadneedle99,5590 00For
Lincoln Financial69,6560 00For
American Century69,2900 00For
QUANTITATIVE MASTER SERIES LLC66,0280 00For
Goldman Sachs50,6020 00For
GuideStone44,5670 00For
MFS42,0180 00For
T. Rowe Price39,4410 00For
Voya36,9920 00For
Putnam30,2820 00For
SEI28,7500 00For
Brighthouse18,2520 8,3340Mixed
ALPS ETF Trust25,9980 00For
Northern Trust23,0760 00For

Showing the 25 largest of 56 asset managers. See all 56 in the interactive database.

4. 3. Approval of Compensation of the Company's Named Executive Officers

Official resultFund totals may overlapSECTION 14A SAY-ON-PAY VOTESReported outcome: Approved

Meeting held May 14, 2026.

Combines 5 wordings of this item as funds reported it.

97% Approved · of votes cast

FOR 97%
FOR: 32,303,076AGAINST: 1,145,400
Details: description as filed, official tally, votes by 212 asset managers

Description as filed by funds: To approve, in a non-binding advisory vote, the compensation of the executive officers named in the Company's Proxy Statement for the Annual General Meeting.

Prothena Corporation plc’s own tally for this item (“3. Approval of Compensation of the Company's Named Executive Officers”): 32,303,076 for, 1,145,400 against — passed, per its Form 8-K filed May 15, 2026 (Item 5.07).

Reported outcome: Approved, in the filing’s own words: “The shareholders approved, in a non-binding advisory vote, the compensation of the Company's executive officers named in the Proxy Statement.”
Support: 97% of votes cast — FOR ÷ (FOR + AGAINST); abstentions and broker non-votes are excluded.

Fund voting reports and institutional-manager reports both cover this item. An institutional manager can report shares that a fund it advises also reports, so the two are shown separately below and never added together, and their sum is not shown (fund and manager reports combined may count the same shares twice).

Fund voting reports: 52 asset managers voting on “To approve, in a non-binding advisory vote, the compensation of the executive officers named in the Company's ” at Prothena Corporation plc, 2025-2026
Asset managerForAgainst AbstainWithheldVote
Fidelity4,430,3540 00For
BlackRock2,176,3270 00For
Vanguard1,911,9421,353 00For
State Street1,345,0280 00For
TIAA755,1100 00For
Federated Hermes728,4220 00For
Charles Schwab362,1880 00For
Bridge Builder Trust220,5920 00For
Nationwide150,0070 00For
Equitable111,6380 00For
MFS111,4370 00For
Columbia Threadneedle82,4220 00For
American Century079,685 00Against
QUANTITATIVE MASTER SERIES LLC66,0280 00For
GuideStone60,6420 00For
Direxion Shares ETF Trust57,7990 00For
Goldman Sachs48,2100 00For
ProShares41,1900 00For
CLEARWATER INVESTMENT TRUST38,3310 00For
Lincoln Financial32,4452,055 00Mixed
MASTER INVESTMENT PORTFOLIO29,4270 00For
ETFis Series Trust I27,1940 00For
Russell Investments25,3680 00For
Northern Trust23,8520 00For
AIG/SunAmerica22,0230 00For

Fund voting reports, all 52 managers: 13,015,972 for, 86,018 against. Showing the 25 largest; see all in the interactive database.

Institutional-manager reports: 176 asset managers voting on “To approve, in a non-binding advisory vote, the compensation of the executive officers named in the Company's ” at Prothena Corporation plc, 2025-2026
Asset managerForAgainst AbstainWithheldVote
Fidelity7,319,6180 00For
BlackRock2,440,30854,540 00For
State Street2,110,3731,164 00For
ACADIAN ASSET MANAGEMENT LLC1,126,2620 00For
Federated Hermes1,003,79315,877 00For
Nuveen758,8350 00For
ADAR1 Capital Management, LLC753,4550 00For
Two Sigma689,7660 00For
GEODE CAPITAL MANAGEMENT, LLC687,1730 00For
JACOBS LEVY EQUITY MANAGEMENT, INC567,8630 00For
DE Shaw494,0140 00For
Charles Schwab362,2610 00For
Vanguard263,3370 00For
Renaissance230,3200 00For
Northern Trust216,5020 00For
T. Rowe Price166,2460 00For
PARAMETRIC PORTFOLIO ASSOCIATES LLC165,1740 00For
MASSACHUSETTS FINANCIAL SERVICES CO /MA/151,5470 00For
MELLON INVESTMENTS Corp128,8990 00For
AQR125,2110 00For
Man Group plc108,2700 00For
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM97,0360 00For
Dimensional85,4790 00For
American Century079,685 00Against
AllianceBernstein69,6070 00For

Institutional-manager reports, all 176 managers: 20,934,078 for, 307,995 against. Showing the 25 largest; see all in the interactive database.

5. 2. Ratification of Appointment of the Company's Independent Registered Public Accounting Firm for 2026 and…

Official resultAUDIT-RELATEDReported outcome: Approved

Meeting held May 14, 2026.

Combines 3 wordings of this item as funds reported it.

99.8% Approved · of votes cast

FOR 99.8%
FOR: 41,931,718AGAINST: 82,815
Details: description as filed, official tally, votes by 52 asset managers

Description as filed by funds: To ratify, in a non-binding vote, the appointment of KPMG LLP as the Company's independent registered public accounting firm for its fiscal year 2026, and to authorize, in a binding vote, the Company's Board of Directors, acting through its Audit Committee, to approve the remuneration of that auditor.

Prothena Corporation plc’s own tally for this item (“2. Ratification of Appointment of the Company's Independent Registered Public Accounting Firm for 2026 and Authorization of the Board of Directors to Approve the Remuneration of that Auditor”): 41,931,718 for, 82,815 against — passed, per its Form 8-K filed May 15, 2026 (Item 5.07).

Reported outcome: Approved, in the filing’s own words: “The shareholders ratified, in a non-binding vote, the appointment of KPMG LLP as the Company's independent registered public accounting firm for its fiscal year ending December 31, 2026, and authorized, in a binding vote, the Company's Board of Directors, acting through its Audit Committee, to appr…”
Support: 99.8% of votes cast — FOR ÷ (FOR + AGAINST); abstentions and broker non-votes are excluded.

The 52 asset managers below reported 13,101,401 for.

FOR
FOR: 13,101,401
Largest asset managers voting on “To ratify, in a non-binding vote, the appointment of KPMG LLP as the Company's independent registered public a” at Prothena Corporation plc, 2025-2026
Asset managerForAgainst AbstainWithheldVote
Fidelity4,430,3540 00For
BlackRock2,176,3270 00For
Vanguard1,913,2940 00For
State Street1,345,0280 00For
TIAA755,1100 00For
Federated Hermes728,4220 00For
Charles Schwab362,1880 00For
Bridge Builder Trust220,5920 00For
Nationwide150,0070 00For
Equitable111,6380 00For
MFS111,4370 00For
Columbia Threadneedle82,4220 00For
American Century79,6850 00For
QUANTITATIVE MASTER SERIES LLC66,0280 00For
GuideStone60,6420 00For
Direxion Shares ETF Trust57,7990 00For
Goldman Sachs48,2100 00For
ProShares41,1900 00For
CLEARWATER INVESTMENT TRUST38,3310 00For
Lincoln Financial34,5000 00For
MASTER INVESTMENT PORTFOLIO29,4270 00For
ETFis Series Trust I27,1940 00For
Russell Investments25,3680 00For
Northern Trust23,8520 00For
AIG/SunAmerica22,0230 00For

Showing the 25 largest of 52 asset managers. See all 52 in the interactive database.

Largest Prothena Corporation plc shareholders voting in 2025-2026

Ranked separately for each type of Form N-PX report. An institutional manager can report shares that a fund it advises also reports, so the two tables can list the same shares and are never added together. Each is ranked by the shares voted on the item that the most managers of that type reported, shown as a share of the 52,353,237 shares outstanding at the time of that meeting.

Fund voting reports: top Prothena Corporation plc shareholders by shares voted on “To approve a reduction in the Company's capital to create distributable reserves.”, 2025-2026
#Asset manager % of shares outstanding
1Fidelity 10.40%
2Vanguard 3.48%
3BlackRock 3.42%
4Federated Hermes 1.26%
5TIAA 1.19%
6Dimensional 0.70%
7Charles Schwab 0.67%
8Exchange Place Advisors Trust 0.39%
9JPMorgan 0.33%
10Nationwide 0.23%
Institutional-manager reports: top Prothena Corporation plc shareholders by shares voted on “To approve, in a non-binding advisory vote, the compensation of the executive officers named in…”, 2025-2026
#Asset manager % of shares outstanding
1Fidelity 13.98%
2BlackRock 4.77%
3State Street 4.03%
4ACADIAN ASSET MANAGEMENT LLC 2.15%
5Federated Hermes 1.95%
6Nuveen 1.45%
7ADAR1 Capital Management, LLC 1.44%
8Two Sigma 1.32%
9GEODE CAPITAL MANAGEMENT, LLC 1.31%
10JACOBS LEVY EQUITY MANAGEMENT, INC 1.08%

Reported Prothena Corporation plc holdings and ownership

As disclosed to the SEC in Form 13F (quarter-end holdings of 30 large managers), Schedules 13D and 13G (beneficial ownership above 5%) and the company’s own proxy statement (DEF 14A). Each row names its form.

Prothena Corporation plc holdings and ownership disclosed for the 2025-2026 proxy season
Holder % outstanding Disclosure
Entities Associated with Fidelity Investments 15.38% DEF14A
FMR (Fidelity) 14.42% 13F
SCULLY WILLIAM P 10.27% 13G
William P. Scully 10.09% DEF14A
Fennell Todd W. 10.03% 13G
BlackRock 8.87% 13F
Todd W. Fennell 8.59% DEF14A
Rubric Capital Management LP 7.02% DEF14A
Vanguard Group 4.09% 13F
State Street 3.70% 13F

Percentages above are of 52,353,237 shares outstanding, as reported by Prothena Corporation plc on its Form 10-Q dated April 30, 2026 (see the filing on EDGAR). This is the count contemporaneous with the 2025-2026 meeting, not today’s. Each holding is as of its own filing, which may be dated before or after the meeting.

About this page

Every figure above is derived from filings made with the US Securities and Exchange Commission: Form N-PX, in which registered funds disclose how they voted every proxy and institutional managers disclose their votes on executive pay (say-on-pay, say-on-frequency and golden parachutes), and Form 8-K Item 5.07, in which the company reports its own meeting results. Shares outstanding are taken from Prothena Corporation plc’s 10-Q dated April 30, 2026. This page is a static snapshot rebuilt weekly on October 18, 2026; a live search always shows the current data.

At Prothena Corporation plc's 2 shareholder meetings in the 2025-2026 proxy season (held November 19, 2025 and May 14, 2026), 218 asset managers reported how they voted on 5 ballot items in their SEC Form N-PX filings, covering 1,085 separate fund positions. On the most widely held item of the season, voted at the meeting held May 14, 2026 — To approve, in a non-binding advisory vote, the compensation of the executive officers named in… — Prothena Corporation plc's filing reports the proposal as approved, with 97% support of the votes cast (FOR divided by FOR plus AGAINST, the conventional basis for proxy support; abstentions, broker non-votes and unvoted shares are excluded because none of them took a side). Source: Prothena Corporation plc's Form 8-K, Item 5.07, filed with the U.S. Securities and Exchange Commission on May 15, 2026.

Prothena Corporation plc proxy season coverage: 2023-2024 · 2024-2025 · 2025-2026 (this page).

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