Mercury Systems SVP sells 582 shares in tax sale

Mercury Systems Inc. senior vice president and chief accounting officer Douglas Munro reported an open-market sale of 582 shares of common stock on February 17, 2026.

Rhea-AI Filing Summary

Mercury Systems Inc. senior vice president and chief accounting officer Douglas Munro reported an open-market sale of 582 shares of common stock on February 17, 2026. The shares were sold at a price of $83.5554 per share as part of a sell-to-cover program to satisfy tax withholding obligations upon the vesting of stock awards.

After this transaction, Munro directly held 14,328 shares of Mercury Systems common stock and indirectly held 248 shares through a 401(k) plan. The filing indicates this was a tax-related sale rather than a discretionary reduction of his overall economic interest.

Insider Trade Summary

Net Seller: 582 shares

Net Sell 2 txns

Insider Munro Douglas

Role SVP, CAO

Sold 582 shs ($49K)

Type	Security	Shares	Price	Value
Sale	Common Stock	582	$83.5554	$49K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 14,328 shares (Direct); Common Stock — 248 shares (Indirect, 401K Plan)

Footnotes (2)

1. F1. Represents shares sold as part of a sell-to-cover program to satisfy tax withholding obligations upon the vesting of stock awards.
2. F2. 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.

FAQ

What did Mercury Systems (MRCY) executive Douglas Munro report in this Form 4?

Douglas Munro reported selling 582 shares of Mercury Systems common stock on February 17, 2026. The shares were sold under a sell-to-cover program to satisfy tax withholding obligations tied to vested stock awards.

At what price were the Mercury Systems (MRCY) shares sold by Douglas Munro?

The 582 shares of Mercury Systems common stock were sold at a per-share price of $83.5554. This price reflects the amount attributed to sales on behalf of all participants in the tax-related sell-to-cover program on that transaction date.

Why did Mercury Systems (MRCY) executive Douglas Munro sell shares in this filing?

The sale was conducted as part of a sell-to-cover program to meet tax withholding obligations triggered by the vesting of stock awards. This indicates the transaction was tax-driven rather than a discretionary sale of investment holdings.

How many Mercury Systems (MRCY) shares does Douglas Munro hold after the reported sale?

Following the tax-related sale, Douglas Munro directly held 14,328 shares of Mercury Systems common stock. In addition, he indirectly held 248 shares through a 401(k) plan, as disclosed in the Form 4 filing.

What type of ownership structures are reported for Douglas Munro’s Mercury Systems (MRCY) shares?

Douglas Munro’s holdings include direct ownership of 14,328 shares of common stock and indirect ownership of 248 shares held through a 401(k) plan. The Form 4 distinguishes clearly between these ownership types.

Does the Form 4 indicate ongoing plan participation for Douglas Munro at Mercury Systems (MRCY)?

Yes. The filing references a sell-to-cover program used to satisfy tax withholding upon vesting of stock awards and notes 401(k) plan holdings, suggesting participation in equity and retirement benefit programs.

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Accepted by SEC EDGAR 02/19/2026 - 04:37 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^*

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)
	SVP, CAO

3. Date of Earliest Transaction (Month/Day/Year)
02/17/2026

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	02/17/2026		S		582(1)	D	$83.5554(2)	14,328	D
Common Stock								248	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	02/19/2026
	** 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.