Company: PRTA
Filing Date: 2025-03-28
Form Type: DEF 14A
Source: 0001559053-25-000017
Chunk: 42

Company: PROTHENA CORP PUBLIC LTD CO
Filing Date: 2025-03-28
Form: DEF 14A
Chunk 42
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) target performance, prorated based on a shortened performance period as of the change in control.

• Prohibition of liberal share recycling on all awards . The 2018 LTIP prohibits any shares withheld for taxes on all awards from being added back to the share reserve, in addition to prohibiting

other practices commonly considered to be liberal share recycling with respect to options and SARs.

• Minimum vesting requirements . Subject to limited exceptions, no awards granted under the 2018 LTIP may vest until the first anniversary of the date of grant, and awards other than options and SARs made to our employees or consultants must become vested over a period of not less than three years.

• Payment of dividends only if underlying awards vest . Dividends and dividend equivalents may only be paid to the extent the underlying award vests.

• No dividends on options or SARs . The 2018 LTIP prohibits the payment of dividends with respect to options and SARs.

| 2025 PROXY STATEMENT |     | 25 |

TABLE OF CONTENTS

| PROPOSAL NO. 4 – APPROVAL OF AN AMENDMENT |

• No repricing or exchange of awards without shareholder approval . Awards may not be repriced, replaced, exchanged, or re-granted through cancellation or modification without shareholder approval if the effect would be to reduce the exercise price for the shares under the award.

• No transferability. Equity awards may only be transferred under limited circumstances and in any event without consideration.

• Fungible share counting; limit on full value awards. Shares issued as full-value awards (awards other than options, SARs, or any other award for which the holder pays the intrinsic value existing as of the date of grant) will have the effect

of reducing the aggregate number of shares available for issuance on a 1.5-to-1 basis. Accordingly, if shareholders approve the Amendment adding 2,000,000 ordinary shares available for issuance under the 2018 LTIP, the maximum number of those shares that may be issued as full-value awards under the Amended 2018 LTIP will be 1,333,333.

• No evergreen feature/shareholder approval required for share reserve increases . The 2018 LTIP does not provide for an annual increase in the share reserve, and the 2018 LTIP may not be amended to increase the share reserve without shareholder approval.

| Outstanding Awards Under our Equity Incentive Plans |

As of March 3, 2025, under the 201