Company: MRCY
Filing Date: 2025-09-10
Form Type: DEF 14A
Source: 0001049521-25-000029
Chunk: 8

Company: MERCURY SYSTEMS INC
Filing Date: 2025-09-10
Form: DEF 14A
Chunk 8
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 as of the record date.

• Admission Procedures. In order to be admitted to the meeting, you must present both an admission ticket and valid government-issued photo identification, such as a driver's license or passport. You must register on or prior to October 10, 2025 in order to obtain an admission ticket.

• Obtaining an Admission Ticket. In order to obtain an admission ticket, please email us at annualmeeting@mrcy.com.

• Security Measures. Upon entering the meeting facility, you may be required to proceed through a security checkpoint. In addition, cameras, recording equipment, electronic devices, large bags, briefcases, and packages will not be permitted in the Annual Meeting.

#### What constitutes a quorum at the meeting?
The presence at the meeting, in person or represented by proxy, of the holders of a majority of our common stock outstanding on August 25, 2025, the record date, will constitute a quorum for purposes of the meeting. On the record date, 60,020,680 shares of our common stock were outstanding. For purposes of determining whether a quorum exists, proxies received but marked "abstain" and so-called "broker non-votes" (described below) will be counted as present.

#### How do I vote my shares?
• Beneficial Shareholders. If you own shares through a broker, bank, or other holder of record (that is, your shares are held in "street name"), you must instruct the holder of record how to vote your shares. In order to provide voting instructions to the holder of record of your shares, please refer to the materials forwarded by your broker, bank, or other holder of record. If your shares are held in "street name" and you wish to vote them at the meeting, you must

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obtain from your broker a properly executed legal proxy identifying you as a Mercury shareholder, authorizing you to act on behalf of the broker at the meeting, and specifying the number of shares with respect to which the authorization is granted. Please contact your broker, bank, or other holder of record to determine the deadline for providing voting instructions.

• Registered Shareholders. If you own shares that are registered in your name, you may vote by proxy before the Annual Meeting by internet at the website indicated on your proxy card, by calling the number indicated on your proxy card, or by signing and returning your proxy card. To vote by internet or telephone, you will need your voting control number