Company: MRCY
Filing Date: 2025-11-05
Form Type: S-8
Source: 0001049521-25-000070
Chunk: 1

Company: MERCURY SYSTEMS INC
Filing Date: 2025-11-05
Form: S-8
Chunk 1
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 for the purpose of registering 1,900,000 shares of common stock, par value $0.01 per share (the “Common Stock”), of Mercury Systems, Inc. (the “Company”) to be offered to participants under the Company’s 2025 Long Term Incentive Plan (“LTIP”).

# PART I
<div align='center'>INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS</div>

#### ITEMS 1 AND 2.
The documents containing the information for the LTIP specified by Part I of this Registration Statement will be sent or given to the employees as specified by Rule 428(b)(1) of the Securities Act of 1933, as amended (the “Securities Act”). Such documents need not be filed with the Securities and Exchange Commission (the “Commission”) either as a part of this Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 of the Securities Act. Such documents and the documents incorporated by reference pursuant to Item 3 of Part II of this Registration Statement, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the Securities Act.

# PART II

### INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

## ITEM 3. INCORPORATION OF DOCUMENTS BY REFERENCE.
The following documents are incorporated herein by reference:

| (a) 
 (b) |     | The Company’s Annual Report on Form 10-K for the fiscal year ended June 27, 2025, as filed with the Commission on August 11, 2025;                                                                                                                        
 The Company’s Definitive Proxy Statement on Schedule 14A, as filed with the Commission on September 10, 2025, to the extent specifically incorporated by reference into the Company’s Annual Report on Form 10-K for the fiscal year ended June 27, 2025; |
|:----|:----|:----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (c) |     | The Company’s Quarterly Report on Form 10-Q for the fiscal quarter ended September 26, 2025, as filed with the Commission on November 4, 2025; and                                                                                                        |
| (d) |     | The Company’s Current Reports on Form 8-K filed with the Commission on October 28, 2025 and November 4, 2025 (Items 1.01, 2.03, and 8.01 only).                                                                                                           |

All reports and documents