Company: PRTA
Filing Date: 2025-10-07
Form Type: DEF 14A
Source: 0001140361-25-037500
Chunk: 3

Company: PROTHENA CORP PUBLIC LTD CO
Filing Date: 2025-10-07
Form: DEF 14A
Chunk 3
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 and any adjournment or postponement of that meeting (the “EGM”). The EGM will be held at the offices of the Company’s legal counsel, A&L Goodbody LLP, 25 North Wall Quay, Dublin 1, D01 H104, Ireland. We have elected to use the internet as our primary means of providing our proxy materials to shareholders. Accordingly, on or about October 7, 2025, we are making this Proxy Statement, the accompanying form of proxy card, and the accompanying Notice of Extraordinary General Meeting of Shareholders available on the internet and mailing a Notice of Internet Availability of Proxy Materials to shareholders of record as of close of business on September 24, 2025 (the “Record Date”). Brokers and other nominees who hold shares on behalf of beneficial owners will be sending their own similar notice. All shareholders as of the Record Date will have the ability to access our proxy materials on the website referred to in the Notice of Internet Availability of Proxy Materials or request to receive a printed set of the proxy materials. Instructions on how to request a printed copy by mail or electronically may be found in the Notice of Internet Availability of Proxy Materials and on the website referred to in the notice, including an option to request paper copies on an ongoing basis. We intend to mail this Proxy Statement, together with the accompanying form of proxy card and Notice of Extraordinary General Meeting of Shareholders, to those shareholders entitled to vote at the EGM who have properly requested paper copies of such materials. The only voting securities of Prothena are our ordinary shares, $0.01 par value per share (“ordinary shares”). There were 53,829,928 ordinary shares issued and outstanding as of the Record Date. A quorum of shareholders is necessary to hold a valid meeting and requires that the shareholders holding a majority of the issued and outstanding ordinary shares entitled to vote are present in person or represented by proxy at the EGM. In this Proxy Statement, we refer to Prothena Corporation plc as the “Company,” “Prothena,” “our,” “we,” or “us” and the Board of Directors as the “Board.” When we refer to Prothena’s fiscal year, we mean the 12-month period ending December 31 of the stated year. The contents of our website are not intended to be incorporated by reference in this Proxy Statement, and any references to our website herein are intended for textual references only.

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TABLE OF CONTENTS

THE PROXY PROCESS AND