Company: PRTA
Filing Date: 2025-03-28
Form Type: DEF 14A
Source: 0001559053-25-000017
Chunk: 94

Company: PROTHENA CORP PUBLIC LTD CO
Filing Date: 2025-03-28
Form: DEF 14A
Chunk 94
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| - |     | Fair Value as of Prior Fiscal Year-End of Option Awards and Stock Awards Granted in Prior Fiscal Years That Failed to Meet Applicable Vesting Conditions During Fiscal Year(g)       |     |      |          — |     |      |          — |     |      |          — |     |      |   -252,901 |     |      |          — |
| = |     | Compensation Actually Paid                                                                                                                                                           |     |      | -1,707,034 |     |      | -3,218,100 |     |      |  7,400,610 |     |      | 41,144,072 |     |      |     62,288 |

(a) Represents Total Compensation as reported in the Summary Compensation Table for the indicated fiscal year.

| 56 |     | 2025 PROXY STATEMENT |

TABLE OF CONTENTS

#### PAY VERSUS PERFORMANCE
(b) Represents the aggregate grant date fair value of the option awards granted to Dr. Kinney during the indicated fiscal year, computed in accordance with the methodology used for financial reporting purposes.

(c) Represents the aggregate fair value as of the indicated fiscal year-end of Dr. Kinney’s outstanding and unvested option awards granted during such fiscal year, computed in accordance with the methodology used for financial reporting purposes.

(d) Represents the aggregate change in fair value during the indicated fiscal year of the outstanding and unvested option awards held by Dr. Kinney as of the last day of the indicated fiscal year, computed in accordance with the methodology used for financial reporting purposes and, for awards subject to performance-based vesting conditions, based on the probable outcome of such performance-based vesting conditions as of the last day of the fiscal year.

(e) Represents the aggregate fair value at vesting of the option awards that were granted to Dr. Kinney and vested during the indicated fiscal year, computed in accordance with the methodology used for financial reporting purposes.

(f) Represents the aggregate change in fair value, measured from the prior fiscal year-end to the vesting date, of each option award held by Dr. Kinney that was granted in a prior fiscal year and which vested during the indicated fiscal year, computed in accordance with the methodology used for financial reporting purposes.

(g) Represents the aggregate fair value as of the last day of the prior fiscal year of Dr. Kinney’s option awards that were granted in a prior fiscal year and which failed to meet the applicable vesting conditions in the indicated fiscal year, computed in