Company: PRTA
Filing Date: 2025-10-07
Form Type: DEF 14A
Source: 0001140361-25-037500
Chunk: 12

Company: PROTHENA CORP PUBLIC LTD CO
Filing Date: 2025-10-07
Form: DEF 14A
Chunk 12
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 to proceed with obtaining the Irish High Court’s confirmation of a reduction in our capital in order to create distributable reserves, and the Irish High Court confirms that reduction in our capital, there is no guarantee that our Board will utilize those distributable reserves by authorizing a share redemption program or any other distribution to our shareholders.

| 6 |     | 2025 PROXY STATEMENT FOR EXTRAORDINARY GENERAL MEETING |

TABLE OF CONTENTS

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

For the reasons described above, we are asking shareholders to approve the following special resolution at the EGM: RESOLVED, as a special resolution, that: Subject to and with confirmation from the Irish High Court, in accordance with sections 84 and 85 of the Irish Companies Act 2014 (the “Act”), the company capital of Prothena Corporation plc (the “Company”) be reduced in the following manner:

| (a) | Subject to (b) below, the entire amount standing to the credit of the share premium account of the Company immediately preceding the passing of this resolution or such lesser amount as the Irish High Court may determine, be cancelled and extinguished such that the reserve resulting from such cancellation be treated as profits available for distribution as defined by section 117 of the Act; and |

| (b) | The Directors of the Company (or any duly authorised committee thereof) be and they are hereby authorised to determine, on behalf of the Company, to proceed to seek confirmation from the Irish High Court of a reduction of up to the entire amount standing to the credit of the share premium account immediately preceding the passage of this resolution or such lesser amount or number as the Directors of the Company (or any duly authorised committee thereof) may approve in their absolute discretion, or to determine not to proceed to seek confirmation of the Irish High Court at all in pursuance of paragraph (a) above. |

Vote Required; Recommendation of the Board Under Irish law, this proposal to reduce the Company’s capital constitutes a special resolution that requires the affirmative vote of 75% of the votes cast in person or by proxy at the EGM in order to be approved. Abstentions and broker non-votes will not have any effect on the outcome of voting on this proposal.

| THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT SHAREHOLDERS VOTE 
 FORAPPROVAL OF THE REDUCTION OF