Mercury Systems CFO forfeits 16,275 stock awards

For MERCURY SYSTEMS INC (MRCY), EVP and CFO David E. Farnsworth reported a disposition of 16,275 shares of common stock on 2026-08-14.

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

For MERCURY SYSTEMS INC (MRCY), EVP and CFO David E. Farnsworth reported a disposition of 16,275 shares of common stock on 2026-08-14. These shares represented performance stock awards that were forfeited due to below-target performance and returned to the issuer. Following this forfeiture, Farnsworth directly holds 141,426 common shares and indirectly holds 1,516 shares through a 401K Plan.

Insider Trade Summary

Disposition: 16,275 shares

Disposition 2 txns

Insider Farnsworth David E.

Role EVP, CFO

Type	Security	Shares	Price	Value
Disposition	Common Stock F1	16,275	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 141,426 shares (Direct); Common Stock — 1,516 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 forfeited: 16,275 shares Transaction price per share: $0.0000 per share Direct holdings after transaction: 141,426 shares +2 more

5 metrics

Shares forfeited 16,275 shares Common Stock performance awards forfeited and disposed to issuer on 2026-08-14

Transaction price per share $0.0000 per share Reported price for the 16,275 forfeited Common Stock shares

Direct holdings after transaction 141,426 shares Common Stock directly owned by David E. Farnsworth following the forfeiture

Indirect 401K holdings 1,516 shares Common Stock held indirectly through a 401K Plan after the reported date

Disposition transactions 1 transaction Number of dispose-type transactions in the filing’s transaction summary

Key Terms

Disposition to issuer, performance stock awards, 401K Plan

3 terms

Disposition to issuer financial

"transaction_code_description: "Disposition to issuer""

performance stock awards financial

"shares underlying performance stock awards that were forfeited"

401K Plan financial

"nature_of_ownership: "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 MRCY executive David E. Farnsworth report on this Form 4?

David E. Farnsworth reported a disposition of 16,275 shares of Mercury Systems common stock on 2026-08-14. The shares were forfeited performance stock awards returned to the issuer after below-target performance.

Were the forfeited MRCY shares sold on the market by the executive?

No. The 16,275 shares were forfeited performance stock awards and treated as a disposition to the issuer, with a reported transaction price of $0.0000 per share, not an open-market sale.

How many MRCY shares does David E. Farnsworth hold directly after this transaction?

After the forfeiture, David E. Farnsworth directly holds 141,426 shares of Mercury Systems common stock. This figure reflects his direct ownership position immediately following the reported disposition to the issuer.

Does David E. Farnsworth have any indirect holdings of MRCY shares?

Yes. In addition to his direct holdings, David E. Farnsworth indirectly holds 1,516 shares of Mercury Systems common stock through a 401K Plan, as reported in the same Form 4 filing.

What caused the forfeiture of the MRCY performance stock awards in this Form 4?

The forfeited 16,275 shares represented shares underlying performance stock awards that were forfeited as a result of below-target performance, according to the transaction footnote.

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

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Accepted by SEC EDGAR 08/18/2026 - 06:18 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^*

Farnsworth David E.

(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, CFO

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		16,275(1)	D	$0	141,426	D
Common Stock								1,516	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)