Mercury Systems (NASDAQ: MRCY) insider plans $55K stock sale

Rhea-AI Filing Summary

MERCURY SYSTEMS INC (MRCY) is the issuer for a planned sale of company stock reported under Rule 144 by Douglas Munro. The notice covers 494 shares of common stock, related to restricted stock vesting on 08/17/2026, with brokerage handled through Fidelity Brokerage Services LLC. A portion of the sale is intended to cover a tax obligation arising from the settlement of a vested equity award distribution.

Key Figures

Planned shares to be sold: 494 shares Approximate value of planned sale: $55,010.70 Planned sale date: 08/18/2026 +2 more

5 metrics

Planned shares to be sold 494 shares Common stock covered by the Rule 144 notice related to restricted stock vesting

Approximate value of planned sale $55,010.70 Total value associated with 494 shares of common stock in the Rule 144 notice

Planned sale date 08/18/2026 Date associated with the 494-share common stock transaction on NASDAQ

Shares sold in past 3 months 404 shares Common stock sold by Douglas Munro on 08/17/2026 in the prior three months

Value of past 3-month sale $44,420.17 Total value of 404 common shares sold on 08/17/2026

Key Terms

Rule 144, Restricted Stock Vesting, vested equity award distribution

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Vesting financial

"Common | 08/17/2026 | Restricted Stock Vesting | Issuer"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

vested equity award distribution financial

"resulting from the settlement of a vested equity award distribution."

FAQ

What does the Form 144 filing for MRCY disclose about Douglas Munro's planned stock sale?

The Form 144 discloses that Douglas Munro plans to sell 494 shares of MERCURY SYSTEMS INC common stock. The sale is in connection with restricted stock vesting on 08/17/2026 and includes shares to cover related tax obligations.

How many MRCY shares are covered by Douglas Munro’s Rule 144 notice and at what approximate value?

The notice covers 494 shares of MERCURY SYSTEMS INC common stock, with a reported total value of about $55,010.70. This reflects the amount associated with the planned sale through Fidelity Brokerage Services LLC on NASDAQ.

What is the reason for Douglas Munro’s planned sale of MRCY shares under Form 144?

The filing states the sale includes an amount necessary to cover a tax obligation from the settlement of a vested equity award distribution. The transaction is tied to restricted stock vesting dated 08/17/2026.

What prior MRCY stock sales by Douglas Munro are disclosed in the last three months?

The document lists a prior sale of 404 shares of MERCURY SYSTEMS INC common stock on 08/17/2026, with a reported total value of approximately $44,420.17 during the past three months.

Who is executing the Rule 144 sale for Douglas Munro’s MRCY shares?

The planned sale is being handled by Fidelity Brokerage Services LLC, located at 900 Salem Street, Smithfield, RI 02917. The Form 144 is signed by Daniel Tucci as a duly authorized representative and attorney-in-fact for Douglas Munro.

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

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Available on EDGAR 08/18/2026 - 03:23 PM Accepted by SEC EDGAR 08/18/2026 - 03:22 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002011703
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MERCURY SYSTEMS INC
SEC File Number	001-41194
Address of Issuer	50 MINUTEMAN ROAD ANDOVER MASSACHUSETTS 01810
Phone	9782561300
Name of Person for Whose Account the Securities are To Be Sold	Munro Douglas
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	494	55010.70	60043283	08/18/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	08/17/2026	Restricted Stock Vesting	Issuer			494	08/17/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Douglas Munro 50 Minuteman Road Andover MA 01810	Common	08/17/2026	404	44420.17

144: Remarks and Signature

Remarks	Sale includes an amount necessary to cover a tax obligation resulting from the settlement of a vested equity award distribution.
Date of Notice	08/18/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Douglas Munro
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)