Company: MRCY
Filing Date: 2025-09-10
Form Type: DEF 14A
Source: 0001049521-25-000029
Chunk: 45

Company: MERCURY SYSTEMS INC
Filing Date: 2025-09-10
Form: DEF 14A
Chunk 45
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 fiscal 2026.

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### VOTING SECURITIES

#### Who owns more than 5% of our stock?
On August 25, 2025, the record date, there were 60,020,680 shares of our common stock outstanding. On that date, to our knowledge, there were five shareholders who owned beneficially more than 5% of our common stock. The table below contains information, as of the dates noted below, regarding the beneficial ownership of these persons or entities. The "Percent of Class" was calculated using the number of shares of our common stock outstanding as of the record date.

| Name of Beneficial Owner                     |     |   Number of Shares 
 Beneficially Owned |     | Percent of Class |
| BlackRock, Inc. (1)                          |     |          7,972,253 |     |            13.3% |
| JANA Management Partners, LP (2)             |     |          5,964,313 |     |              9.9 |
| The Vanguard Group, Inc. (3)                 |     |          5,669,352 |     |              9.4 |
| William Blair Investment Management, LLC (4) |     |          4,695,683 |     |              7.8 |
| State Street Corporation (5)                 |     |          2,987,185 |     |              5.0 |

(1) Based on a Schedule 13G/A filed by Black Rock, Inc. ("Black Rock") with the SEC on July 17, 2025, reporting beneficial ownership as of June 30, 2025. In such Schedule 13G/A, Black Rock reported that it had sole voting power of 7,844,696 shares of our common stock, shared voting power of 0 shares of our common stock, sole dispositive power of 7,972,253 shares of our common stock, and shared dispositive power of 0 shares of our common stock. The reporting entity's address is 50 Hudson Yards, New York, New York 10001.

(2) Based on a Schedule 13D/A filed by JANA Management Partners, LP ("JANA") with the SEC on August 15, 2025, reporting beneficial ownership as of August 13, 2025. In such Schedule 13D/A, JANA reported that it had sole voting