Company: PRTA
Filing Date: 2025-09-25
Form Type: PRE 14A
Source: 0001140361-25-036135
Chunk: 10

Company: PROTHENA CORP PUBLIC LTD CO
Filing Date: 2025-09-25
Form: PRE 14A
Chunk 10
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 be submitted in writing no later than November 28, 2025, to our Company Secretary at Prothena Corporation plc, 77 Sir John Rogerson’s Quay, Block C, Grand Canal Docklands, Dublin 2, D02 VK60, Ireland; provided that if the date of next year’s annual general meeting of shareholders is greater than 30 days from May 13, 2026, the deadline is a reasonable time before we begin to print and send our proxy materials for next year’s annual general meeting. For a shareholder to make any formal nomination of a director candidate for election to the Board at the 2026 annual general meeting of shareholders, the shareholder must provide notice to the Company not earlier than October 29, 2025, and not later than December 28, 2025, and must otherwise comply with the requirements set forth in our Constitution. You are advised to review our Constitution, which contains additional requirements about advance notice of director nominations. In addition to satisfying the requirements regarding director nominations in our Constitution, to comply with the universal proxy rules, shareholders who intend to solicit proxies in support of director nominees other than the Company’s nominees must provide notice that sets forth the information required by Rule 14a-19 under the Exchange Act no later than March 14, 2026.

| 2025 PROXY STATEMENT FOR EXTRAORDINARY GENERAL MEETING |     | 5 |

TABLE OF CONTENTS

| PROPOSAL 
 NO. 1    |     | APPROVAL OF A REDUCTION OF THE 
 COMPANY’S CAPITAL TO CREATE    
 DISTRIBUTABLE RESERVES         |

Background

Under Irish law, we may repurchase or redeem our shares, pay dividends, or make other distributions to our shareholders only out of our “distributable reserves”, which generally means accumulated realized profits less accumulated realized losses. Irish law permits the Company - subject to the approval of shareholders and the confirmation of the Irish High Court - to reduce all or part of its share premium account and credit the resulting sum to the Company’s profit and loss account. At our annual general meeting of shareholders on May 18, 2021, our shareholders approved a reduction of the Company’s capital which was subsequently approved by the Irish High Court on December 14, 2021. As a result of impairments recognized on our investment in subsidiaries, our “distributable reserves” have been reduced and as of December 31, 2024, we had approximately $49.3 million in distributable reserves.