Mercury Systems EVP sells 4,000 shares at $84

Mercury Systems’ EVP and CHRO reported an open-market style sale of 4,000 common shares at about $84.51, retaining over 19,000 shares afterward.

Rhea-AI Filing Summary

Mercury Systems Inc (MRCY) executive Steven Ratner, EVP and Chief Human Resources Officer, reported selling 4,000 shares of common stock on September 3, 2026 in a sale characterized as taking place in the open market or a private transaction. The shares were sold at a weighted average price of $84.51 per share, with individual trades executed between $84.49 and $84.52 per share, as disclosed in the footnote. After this transaction, he directly holds 19,275 shares of Mercury Systems common stock and also holds 55 shares indirectly through a 401K plan. No Rule 10b5-1 trading plan is reported for this sale.

Insider Trade Summary

Net Seller: 4,000 shares

Net Sell 2 txns

Insider Ratner Steven

Role EVP, CHRO

Sold 4,000 shs ($338K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1	4,000	$84.5076	$338K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 19,275 shares (Direct); Common Stock — 55 shares (Indirect, 401K Plan)

Footnotes (1)

1. F1. This transaction was executed in multiple trades at prices ranging from $84.49 to $84.52. The price reported above reflects the weighted average sale 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.

Key Figures

Shares sold: 4,000 shares Weighted average sale price: $84.51 per share Sale price range: $84.49–$84.52 per share +3 more

6 metrics

Shares sold 4,000 shares Common stock sale reported for September 3, 2026

Weighted average sale price $84.51 per share Average of multiple trades on September 3, 2026

Sale price range $84.49–$84.52 per share Price range of individual trades in the reported sale

Direct holdings after transaction 19,275 shares Common stock directly held by Steven Ratner after the sale

Indirect holdings after transaction 55 shares Common stock held through a 401K plan after the transaction

Net shares sold in this filing 4,000 shares Net share change across all reported non-derivative transactions

Key Terms

weighted average sale price, open market or private transaction, indirect ownership

3 terms

weighted average sale price financial

"The price reported above reflects the weighted average sale price."

open market or private transaction financial

"Sale in open market or private transaction"

indirect ownership financial

"Shares held indirectly through a 401K plan"

FAQ

What did Mercury Systems (MRCY) executive Steven Ratner report on this Form 4?

He reported a sale of 4,000 shares of Mercury Systems common stock on September 3, 2026, in a transaction described as an open market or private sale, at a weighted average price of about $84.51 per share.

At what price did the Mercury Systems (MRCY) shares sell in Steven Ratner’s transaction?

The reported weighted average sale price was $84.51 per share, with individual trades executed at prices ranging from $84.49 to $84.52 per share, according to the footnote disclosure.

How many Mercury Systems (MRCY) shares does Steven Ratner own after this Form 4 transaction?

After the reported sale, Steven Ratner directly owns 19,275 shares of Mercury Systems common stock and also holds 55 shares indirectly through a 401K plan.

Was Steven Ratner’s Mercury Systems (MRCY) trade under a Rule 10b5-1 plan?

No. The filing indicates that the Rule 10b5-1 checkbox is not marked and the footnote does not reference any trading plan, so no Rule 10b5-1 plan is reported for this sale.

What role does Steven Ratner hold at Mercury Systems (MRCY)?

Steven Ratner is reported as an Executive Vice President and Chief Human Resources Officer of Mercury Systems Inc in this ownership filing.

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Available on EDGAR 09/08/2026 - 09:47 PM Accepted by SEC EDGAR 09/08/2026 - 09:46 PM Learn about SEC filing dates

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 MASSACHUSETTS 01810

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/03/2026

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

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

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

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	09/03/2026		S		4,000	D	$84.5076(1)	19,275	D
Common Stock								55	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 $84.49 to $84.52. The price reported above reflects the weighted average sale 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	09/08/2026
	** 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.
* Form 4: SEC 1474 (03-26)