Company: PRTA
Filing Date: 2025-03-28
Form Type: DEF 14A
Source: 0001559053-25-000017
Chunk: 52

Company: PROTHENA CORP PUBLIC LTD CO
Filing Date: 2025-03-28
Form: DEF 14A
Chunk 52
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 treated as one which does not meet the requirements of the Code for ISOs and the tax consequences described for NQSOs will apply in the year of disposition, although the amount of income recognized by the participant will be the lesser of (a) the excess of the fair market value of the shares at the time of exercise over the exercise price, or (b) the excess of the amount realized on the disposition over the exercise price.

The current federal income tax consequences of other awards authorized under the Amended 2018 LTIP generally follow certain basic patterns: SARs are taxed and deductible in substantially the same manner as NQSOs; nontransferable restricted shares subject to a substantial risk of forfeiture will result in income recognition equal to the excess of the fair market value over the price paid, if any, only at the time the restrictions applicable to such awards lapse (unless the recipient elects to accelerate recognition as of the date of grant); RSUs, share-based performance awards, dividend equivalents, and other types of awards are generally subject to tax at ordinary income rates at the time of payment. In each of the foregoing cases, the Company (or the applicable employer) will generally have a corresponding deduction at the time the participant recognizes income, subject to Section 162(m) of the Code with respect to covered employees.

| 30 |     | 2025 PROXY STATEMENT |

TABLE OF CONTENTS

| PROPOSAL NO. 4 – APPROVAL OF AN AMENDMENT |

| New Plan Benefits |

The Amended 2018 LTIP does not require set benefits or amounts to be granted to participants, but instead awards are subject to the discretion of the plan administrator. Therefore, it is not possible to determine the benefits that will be received in the future by participants in the Amended 2018 LTIP. Information regarding awards granted in fiscal year 2024 under the Amended 2018 LTIP to the named

executive officers is provided in the Summary Compensation Table – Fiscal Year 2024 and the Grants of Plan-Based Awards – Fiscal Year 2024 table. Information regarding awards granted in fiscal year 2024 under the Amended 2018 LTIP to non-employee directors is provided in the Director Compensation – Fiscal Year 2024 table.

| Equity Award Grants Under the 2018 LTIP and the 2020 EIIP Since Inception |

The following table provides summary information concerning the number of our ordinary shares subject to awards granted under the 2018 LTIP and the