Mercury Systems EVP forfeits 2,695 performance shares

MERCURY SYSTEMS INC (MRCY) reported an insider equity change by executive vice president and chief human resources officer Steven Ratner.

The filer has since corrected this document, so the figures below are the ones originally reported and some of them may have changed. Read the amended Form 4/A for what the company says now.

Rhea-AI Filing Summary

MERCURY SYSTEMS INC (MRCY) reported an insider equity change by executive vice president and chief human resources officer Steven Ratner. On 2026-08-14, Ratner disposed of 2,695 shares of common stock back to the issuer, at a reported price of $0.00 per share, in a transaction classified as a disposition to issuer. According to a footnote, these shares represented performance stock awards that were forfeited due to below-target performance of the awards. After this event, Ratner held 29,543 shares directly and an additional 356 shares indirectly through a 401K Plan.

Insider Trade Summary

Disposition: 2,695 shares

Disposition 2 txns

Insider Ratner Steven

Role EVP, CHRO

Type	Security	Shares	Price	Value
Disposition	Common Stock F1	2,695	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 29,543 shares (Direct); Common Stock — 356 shares (Indirect, 401K Plan)

Footnotes (1)

1. F1. Represents shares underlying performance stock awards that were forfeited as a result of below-target performance.

Key Figures

Shares disposed to issuer: 2,695 shares Disposition price per share: $0.00 per share Direct holdings after transaction: 29,543 shares +1 more

4 metrics

Shares disposed to issuer 2,695 shares Common Stock disposition to issuer on 2026-08-14

Disposition price per share $0.00 per share Reported transaction price for 2,695 forfeited shares

Direct holdings after transaction 29,543 shares Common Stock directly owned by Steven Ratner following disposition

Indirect holdings after transaction 356 shares Common Stock held indirectly through a 401K Plan

Key Terms

Disposition to issuer, performance stock awards, 401K Plan

3 terms

Disposition to issuer financial

"transaction is classified as a disposition to issuer"

performance stock awards financial

"shares underlying performance stock awards that were forfeited"

401K Plan financial

"indirectly through a 401K Plan"

A 401(k) plan is an employer-sponsored retirement savings account that lets workers set aside part of their paycheck into investments, often with tax breaks and sometimes with matching contributions from the employer. Think of it as a workplace piggy bank that grows through employee contributions, optional company top-ups, and market returns; it matters to investors because it shapes household retirement security, drives large flows of money into public markets, and affects a company’s compensation costs and ability to attract and keep talent.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MERCURY SYSTEMS INC (MRCY) report for Steven Ratner?

MERCURY SYSTEMS INC reported that Steven Ratner disposed of 2,695 shares of common stock to the issuer. The shares represented performance stock awards that were forfeited due to below-target performance of the awards.

How many MRCY shares did Steven Ratner forfeit in this Form 4 filing?

Steven Ratner forfeited 2,695 shares of MERCURY SYSTEMS INC common stock. A footnote states these shares were underlying performance stock awards that were forfeited because the awards achieved below-target performance.

What was the reported price for Steven Ratner’s MRCY share disposition?

The disposition of 2,695 shares by Steven Ratner was reported at $0.00 per share. The filing classifies this as a disposition to the issuer associated with the forfeiture of performance stock awards for below-target performance.

How many MRCY shares does Steven Ratner hold after this transaction?

After the transaction, Steven Ratner directly held 29,543 shares of MERCURY SYSTEMS INC common stock. He also indirectly held 356 shares through a 401K Plan, as reported in the Form 4 holding entry.

Was Steven Ratner’s MRCY Form 4 transaction under a Rule 10b5-1 trading plan?

The Rule 10b5-1 checkbox for this Form 4 is not checked, and no footnote indicates a trading plan. The transaction is reported simply as a disposition to the issuer tied to forfeited performance stock awards.

What is the role of Steven Ratner at MERCURY SYSTEMS INC (MRCY) in this Form 4?

Steven Ratner is identified as an officer of MERCURY SYSTEMS INC with the title EVP, CHRO. The Form 4 reports his equity disposition and remaining direct and indirect holdings in the company’s common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 08/18/2026 - 06:26 PM EDT 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)
08/14/2026

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	08/14/2026		D		2,695(1)	D	$0	29,543	D
Common Stock								356	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 underlying performance stock awards that were forfeited as a result of below-target performance.

	/s/ Douglas Munro, attorney-in-fact	08/18/2026
	** 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)