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Mercury Systems CFO granted 8,212 RSUs

Mercury Systems’ EVP and CFO received a three-year vesting award of 8,212 RSUs, increasing his reported direct and 401K share holdings.

(Neutral)
(Neutral)
Form Type
4/A

Rhea-AI Filing Summary

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

MERCURY SYSTEMS INC (MRCY) reports that EVP and CFO David E. Farnsworth received a grant of 8,212 shares of common stock on August 17, 2026 as a compensation award. These are in the form of restricted stock units that vest in equal annual increments over three years. After this grant, he held 148,293 common shares directly and 1,516 shares indirectly through a 401K Plan. This amendment corrects a prior omission of the RSU grant.

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Insider Farnsworth David E.
Role EVP, CFO
Type Security Shares Price Value
Grant/Award Common Stock F1 8,212 $0.00 $0.00
holding Common Stock -- -- --
Holdings After Transaction: Common Stock — 148,293 shares (Direct); Common Stock — 1,516 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.
RSUs granted 8,212 shares Restricted stock units granted on August 17, 2026
Vesting period 3 years RSUs vest in equal annual increments over three years
Direct holdings after grant 148,293 shares Common stock directly owned by David E. Farnsworth after the RSU grant
Indirect 401K holdings 1,516 shares Common stock held indirectly through a 401K Plan after the transactions
Grant price per share $0.00 per share Compensation award of restricted stock units with no cash price
Role of reporting person EVP, CFO Officer title of David E. Farnsworth at Mercury Systems Inc.
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.
Form 4/A regulatory
"This amendment is being filed to correct the inadvertent omission"
Form 4/A is an amended filing that corrects or updates an earlier Form 4, the mandatory report that insiders (like company executives, directors, or large shareholders) must file when their ownership stakes change. Think of it as an edited receipt showing who bought or sold stock and when; investors use it to track insider confidence, detect potential conflicts, and spot trading patterns that might signal future company prospects.
401K Plan financial
"Indirect ownership 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 in this Form 4/A?

The company reported that EVP and CFO David E. Farnsworth received a grant of 8,212 shares of common stock in the form of restricted stock units on August 17, 2026 as a compensation award.

Why was this Form 4/A for MRCY filed as an amendment?

It was filed to correct the inadvertent omission of the restricted stock unit grant to David E. Farnsworth that occurred on August 17, 2026 and was not included in a prior filing.

How do the 8,212 RSUs granted by MRCY vest for the CFO?

The 8,212 restricted stock units vest in equal annual increments over three years following the August 17, 2026 grant date, meaning one-third of the units vest each year during that period.

What are David E. Farnsworth’s direct common stock holdings in MRCY after the grant?

Following the 8,212-share RSU grant, David E. Farnsworth is reported to hold 148,293 shares of Mercury Systems common stock as direct ownership.

What indirect MRCY holdings does the CFO have after this transaction?

In addition to his direct holdings, David E. Farnsworth is reported to hold 1,516 shares of Mercury Systems common stock indirectly through a 401K Plan after the reported transactions.

Was the MRCY CFO’s RSU grant made under a Rule 10b5-1 trading plan?

No. The filing indicates that no Rule 10b5-1 plan is reported for the transactions disclosed, meaning the RSU grant is not identified as being made under such a plan.

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

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Learn about SEC filing dates
SEC Form 4
FORM 4UNITED 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)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP, CFO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/17/2026A8,212(1)A$0148,293D
Common Stock1,516I401K 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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-fact09/15/2026
** Signature of Reporting PersonDate
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)

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