[Form 4] Mercury Systems Inc. Insider Trading Activity

Rhea-AI Filing Summary

Steven Ratner, EVP and CHRO of Mercury Systems (MRCY), reported a sale of common stock. On 08/20/2025 he disposed of 7,000 shares in multiple trades at a weighted average price of $63.7589, with execution prices ranging from $63.73 to $63.88. After the reported transaction he beneficially owned 33,801 shares directly and held an indirect interest in 81 shares via a 401(k) plan. The Form 4 was signed on behalf of the reporting person on 08/25/2025.

Positive

• Timely disclosure of insider transaction via Form 4, filed and signed within days after the sale
• Transaction details provided include weighted average price and execution price range, aiding transparency

Negative

• Insider sold 7,000 shares, which reduces the reporting persons direct stake to 33,801 shares
• No disclosure in the form indicating the sale was pursuant to a Rule 10b5-1 trading plan

Insights

Financial Analyst

TL;DR: A routine insider sale of 7,000 shares was disclosed; no additional financial metrics or company performance data are included.

The filing documents an open-market sale by an executive, showing a weighted average price of $63.7589 and execution range $63.73–$63.88. The disclosure includes the reporting persons remaining direct ownership of 33,801 shares and 81 shares held indirectly in a 401(k). This is a standard Section 16 filing and does not include earnings, guidance, or other operational data that would change an investment thesis on its own.

Corporate Governance Expert

TL;DR: Proper Form 4 disclosure of an insider sale; indicates compliance with Section 16 reporting requirements.

The Form 4 shows the transaction was reported and signed by an attorney-in-fact within days of the sale date, reflecting routine compliance. The nature of the transaction is an open-market sale executed in multiple trades. No indication of a Rule 10b5-1 plan or other mitigating disclosure is provided in the form text.

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Ratner Steven

(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)
	EVP, CHRO

3. Date of Earliest Transaction (Month/Day/Year)
08/20/2025

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	08/20/2025		S		7,000	D	$63.7589(1)	33,801	D
Common Stock								81	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. This transaction was executed in multiple trades at prices ranging from $63.73 to $63.88. The price reported above reflects the weighted average purchase price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

	/s/ Douglas Munro, attorney-in-fact	08/25/2025
	** 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 did Steven Ratner sell according to the MRCY Form 4?

The Form 4 reports that Steven Ratner disposed of 7,000 shares of Mercury Systems common stock on 08/20/2025.

At what price were the MRCY shares sold?

The sale was executed in multiple trades at prices ranging from $63.73 to $63.88, with a weighted average price of $63.7589.

How many MRCY shares does the reporting person own after the sale?

After the reported transaction the reporting person beneficially owns 33,801 shares directly and 81 shares indirectly through a 401(k) plan.

When was the Form 4 signed and filed?

The Form 4 was signed by an attorney-in-fact on 08/25/2025, five days after the transaction date.

Was the sale disclosed as part of a 10b5-1 trading plan?

The Form contains no statement indicating the transaction was made pursuant to a Rule 10b5-1 trading plan.