Company: MRCY
Filing Date: 2025-09-10
Form Type: DEF 14A
Source: 0001049521-25-000029
Chunk: 4

Company: MERCURY SYSTEMS INC
Filing Date: 2025-09-10
Form: DEF 14A
Chunk 4
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 |     | Former Managing Partner,                        PricewaterhouseCoopers                                              |     | Yes         |     | C,F                   |     |    |     | C   |     |     |     |     |
| Scott OstfeldClass II Director              Term Ending in 2026                                             |     |           2023 |     | Managing Partner and Portfolio Manager,        JANA Partners                                                        |     | Yes         |     |                       |     | M  |     |     |     |     |     | M   |
| Debora A. PlunkettClass III Director             Term Ending in 2027                                        |     |           2021 |     | Federal Senior Executive                         National Security Agency (Retired)                                 |     | Yes         |     | M                     |     |    |     | M   |     | M   |     |     |

| AC = Audit Committee                          |     | GRC = Government Relations Committee |     | M = Member           |
| HC = Human Capital and Compensation Committee |     | M&A = M&A and Finance Committee      |     | C = Committee Chair  |
| NGC = Nominating and Governance Committee     |     |                                      |     | F = Financial Expert |

We are proposing that William L. Ballhaus, Lisa S. Disbrow, and Howard L. Lance, three continuing Class I directors, be elected to serve terms of three years, and in each case until their successors are duly elected and qualified or until they sooner die, resign, or are removed. We are also proposing that Jean Bua, a Class II director, be elected to serve a term of one year, until her successor is duly elected and qualified or until she sooner dies, resigns, or is removed. With respect to the

<div align='center'>v</div>

nominees for Class I director standing for election at the meeting, Mr. Ballhaus, our Chairman, President, and Chief Executive Officer, was appointed to the Board in 2022, Ms. Disbrow was appointed to the Board in 2017, and Mr. Lance was appointed to the Board in 2022. Ms. Bua, who joined the Board in January 2025, is a Class II director and is standing for election this year pursuant to our Board Policy for a one-year term until the Class II directors are up for re-election in 2026 for a three year term.

Environmental, Social, and Corporate Governance Highlights

#### Governance
Our