Company: PRTA
Filing Date: 2025-10-07
Form Type: DEF 14A
Source: 0001140361-25-037500
Chunk: 7

Company: PROTHENA CORP PUBLIC LTD CO
Filing Date: 2025-10-07
Form: DEF 14A
Chunk 7
---
 proxy materials instead of a full set of proxy materials? |

Pursuant to rules of the U.S. Securities and Exchange Commission (the “SEC”), Irish law, and our Constitution, we have elected to provide access to our proxy materials on the internet. Accordingly, we are sending a Notice of Internet Availability of Proxy Materials to our shareholders. All shareholders will have the ability to access the 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 access the proxy materials on the internet or to request a printed copy may be found in the Notice of Internet Availability of Proxy Materials. In addition, shareholders may request to receive proxy materials in printed form by mail or electronically by email on an ongoing basis. We encourage shareholders to take advantage of the availability of the proxy materials on the internet to help reduce the environmental impact of the EGM.

| 2025 PROXY STATEMENT FOR EXTRAORDINARY GENERAL MEETING |     | 3 |

TABLE OF CONTENTS

| THE PROXY PROCESS AND SHAREHOLDER VOTING                     
 QUESTIONS AND ANSWERS ABOUT THESE PROXY MATERIALS AND VOTING |

| 8. |     | How do I vote via internet or telephone? |

You may vote by proxy on the internet by following the instructions provided on the proxy card or in the Notice of Internet Availability of Proxy Materials. If you request printed copies of the proxy materials by mail, you may vote by proxy by calling the toll-free number found on the proxy card. Please be aware that if you vote on the internet, you may incur costs such as internet access or telephone charges for which you will be responsible. The internet and telephone voting facilities for eligible shareholders of record will close at 11:59 p.m. Eastern Time on November 18, 2025. The giving of such a proxy by internet or telephone will not affect your right to vote in person should you decide to attend the EGM. The internet and telephone voting procedures are designed to authenticate shareholders’ identities, to allow shareholders to give their voting instructions and to confirm that shareholders’ instructions have been recorded properly. If you vote by internet or telephone, that vote authorizes your proxy in the same manner as if you signed, dated, and returned a written proxy card by mail.

| 9. |     | What if I return a proxy card but do not make specific choices? |

If we receive a signed and dated proxy card and the proxy card does not specify how your