[Form 4] MERCURY SYSTEMS INC Insider Trading Activity

Rhea-AI Filing Summary

Douglas Munro, Vice President and Chief Accounting Officer of Mercury Systems (MRCY), reported an insider sale on 09/16/2025. The Form 4 shows 67 shares of Mercury Systems common stock were sold under transaction code S as part of a sell-to-cover program at an attributed per-share price of $73.4042. After the transaction the reporting person beneficially owned 16,007 shares directly and an additional 222 shares indirectly through a 401(k) plan. The filing is signed and dated 09/17/2025.

Positive

• Timely disclosure: Form 4 was signed and filed, documenting the transaction and post-sale holdings
• Clear explanation: The filing states the sale was a sell-to-cover to satisfy tax withholding obligations

Negative

• Insider sale reported: Reporting person disposed of 67 shares on 09/16/2025

Insights

Financial Analyst

TL;DR: Insider sold a small number of shares via sell-to-cover; filing discloses post-transaction holdings precisely.

The report documents a sale of 67 shares at an attributed price of $73.4042 on 09/16/2025, executed as a sell-to-cover to satisfy tax withholding on vested awards. The filing also specifies direct beneficial ownership of 16,007 shares and 222 shares held indirectly in a 401(k) plan. The disclosure is factual and limited to the transaction details; no earnings, new grants, or other material corporate events are included.

Corporate Governance Expert

TL;DR: Submission meets Section 16 reporting requirements and clarifies nature of the sale.

The Form 4 clearly identifies the reporting persons role as VP, CAO and indicates the sale was part of a sell-to-cover program, with an attributed per-share price and resulting ownership counts. The form is signed and dated, fulfilling procedural disclosure obligations. The filing contains no additional governance actions, director departures, or material corporate decisions.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Munro Douglas

(Last) (First) (Middle)

50 MINUTEMAN ROAD

(Street)

ANDOVER MA 01810

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MERCURY SYSTEMS INC [ MRCY ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP, CAO

3. Date of Earliest Transaction (Month/Day/Year)
09/16/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/16/2025		S		67(1)	D	$73.4042(2)	16,007	D
Common Stock								222	I	401K Plan

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares sold as part of a sell-to-cover program to satisfy tax withholding obligations upon the vesting of stock awards.

2. Represents the per share price attributed to sales of shares on behalf of all participants under the sell-to-cover program on the transaction date indicated.

	/s/ Douglas Munro	09/17/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What transaction did Douglas Munro report on Form 4 for MRCY?

The Form 4 reports a sale of 67 shares of Mercury Systems common stock on 09/16/2025 as part of a sell-to-cover program.

At what price were the shares sold according to the Form 4?

The filing shows an attributed per-share price of $73.4042 for the sale conducted on 09/16/2025.

How many Mercury Systems shares does the reporting person own after the transaction?

After the reported transaction the reporting person beneficially owned 16,007 shares directly and 222 shares indirectly via a 401(k) plan.

What was the stated reason for the sale in the Form 4?

The filing explains the shares were sold under a sell-to-cover program to satisfy tax withholding obligations upon the vesting of stock awards.

When was the Form 4 signed?

The Form 4 is signed by Douglas Munro and dated 09/17/2025.