Mercury Systems EVP granted 5,187 shares

Mercury Systems amended a prior insider report to add a three-year vesting restricted stock unit grant to its EVP and CHRO.

This filing corrects an earlier one, and you can read the original Form 4 if you want to see what changed.

Rhea-AI Filing Summary

MERCURY SYSTEMS INC (symbol: MRCY) is the issuer of record for a Form 4/A filing submitted to the SEC. Ratner Steven reported acquisition or exercise transactions in this Form 4 filing.

MERCURY SYSTEMS INC (MRCY) reports that executive vice president and chief human resources officer Steven Ratner received a grant of 5,187 shares of common stock in the form of restricted stock units on August 17, 2026. These restricted stock units vest in equal annual installments over three years. Following this award, Ratner holds 33,646 shares directly and 356 shares indirectly through a 401K plan. No transactions are reported as made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Grant/Award: 5,187 shares

Grant/Award 2 txns

Insider Ratner Steven

Role EVP, CHRO

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	5,187	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 33,646 shares (Direct); Common Stock — 356 shares (Indirect, 401K Plan)

Footnotes (1)

1. F1. Represents restricted stock units that vest in equal annual increments over the three-year period following the grant date.

Key Figures

Restricted stock units granted: 5,187 shares Direct holdings after grant: 33,646 shares Indirect holdings after grant: 356 shares +2 more

5 metrics

Restricted stock units granted 5,187 shares Equity award to Steven Ratner on August 17, 2026

Direct holdings after grant 33,646 shares Common stock held directly by Steven Ratner after the reported grant

Indirect holdings after grant 356 shares Common stock held indirectly through a 401K plan

Vesting period 3 years Restricted stock units vest in equal annual increments over three years

Grant price per share $0.00 Equity award granted without cash payment by the executive

Key Terms

restricted stock units

1 terms

restricted stock units financial

"Represents restricted stock units that vest in equal annual increments"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

FAQ

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

What insider transaction did MRCY report for Steven Ratner on August 17, 2026?

The company reported that Steven Ratner received a grant of 5,187 restricted stock units of Mercury Systems common stock on August 17, 2026, as part of his compensation. These units vest over three years in equal annual installments.

How many Mercury Systems (MRCY) shares does Steven Ratner hold after this grant?

After the August 17, 2026 grant, Steven Ratner holds 33,646 shares of Mercury Systems common stock directly and 356 shares indirectly through a 401K plan, as reported in the filing.

What are the vesting terms of the restricted stock units granted by MRCY to Steven Ratner?

The filing states that the restricted stock units granted to Steven Ratner vest in equal annual increments over the three-year period following the August 17, 2026 grant date.

Was Steven Ratner’s MRCY restricted stock unit grant made under a Rule 10b5-1 plan?

No. The filing indicates no Rule 10b5-1 trading plan applies to the reported grant; the document-level trading plan box is not checked for these transactions.

Why did Mercury Systems file an amended Form 4/A for MRCY?

The amendment was filed to correct the omission of the restricted stock unit grant to Steven Ratner on August 17, 2026, which had been inadvertently left out of the original insider report.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 09/15/2026 - 06:13 PM Accepted by SEC EDGAR 09/15/2026 - 06:12 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)
08/17/2026

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)
08/18/2026

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	08/17/2026		A		5,187(1)	A	$0	33,646	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 restricted stock units that vest in equal annual increments over the three-year period following the grant date.

Remarks:

This amendment is being filed to correct the inadvertent omission of the grant of restricted stock units to the reporting person on August 17, 2026.

	/s/ Douglas Munro, attorney-in-fact	09/15/2026
	** 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)