Mercury Systems holder plans 109-share stock sale

MERCURY SYSTEMS INC (MRCY) is the issuer of common stock that Douglas Munro plans to sell under Rule 144.

Rhea-AI Filing Summary

MERCURY SYSTEMS INC (MRCY) is the issuer of common stock that Douglas Munro plans to sell under Rule 144. A notice covers a planned sale of 109 shares of common stock, related to restricted stock vesting on 08/19/2026, with Fidelity Brokerage Services LLC acting as broker. Recent sales over the prior three months include multiple small transactions in MRCY common stock, and part of the sale is noted as covering a tax obligation from a vested equity award distribution.

Key Figures

Planned shares to be sold: 109 shares Value of planned shares held at broker: 10646.40 Prior sale on 08/17/2026: 404 shares for 44420.17 +4 more

7 metrics

Planned shares to be sold 109 shares Common stock sale related to restricted stock vesting on 08/19/2026

Value of planned shares held at broker 10646.40 Value associated with 109 shares of common stock at Fidelity Brokerage Services LLC

Prior sale on 08/17/2026 404 shares for 44420.17 Douglas Munro sale of MRCY common stock on 08/17/2026

Prior sale on 08/18/2026 494 shares for 55010.70 Douglas Munro sale of MRCY common stock on 08/18/2026

Prior sale on 08/19/2026 548 shares for 54967.69 Douglas Munro sale of MRCY common stock on 08/19/2026

CUSIP-like identifier field 60136133 Identifier listed with MRCY common stock in the securities information section

Date of Notice 08/20/2026 Filing date for the Rule 144 notice covering the planned sale

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 | 08/19/2026 | 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

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

FAQ

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

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

The Form 144 reports that Douglas Munro plans to sell 109 shares of MERCURY SYSTEMS INC (MRCY) common stock. The sale is tied to restricted stock vesting on 08/19/2026 and is facilitated through Fidelity Brokerage Services LLC.

What is the nature of the securities being sold in this MRCY Form 144?

The securities are common stock of MERCURY SYSTEMS INC (MRCY). The planned sale of 109 shares arises from restricted stock vesting classified as compensation, with the issuer listed as MERCURY SYSTEMS INC and trading on NASDAQ.

How many MRCY shares has Douglas Munro sold in the past three months?

Douglas Munro has reported three prior sales of MRCY common stock: 404 shares on 08/17/2026, 494 shares on 08/18/2026, and 548 shares on 08/19/2026. Each transaction includes a corresponding dollar value received for the shares sold.

What dollar amounts were received from recent MRCY stock sales reported by Douglas Munro?

Recent sales generated proceeds of $44,420.17 for 404 shares on 08/17/2026, $55,010.70 for 494 shares on 08/18/2026, and $54,967.69 for 548 shares on 08/19/2026. These amounts reflect the values reported for each respective transaction.

Why does the Form 144 for MRCY mention a tax obligation related to the sale?

The remarks state that the sale includes an amount necessary to cover a tax obligation from the settlement of a vested equity award distribution. This indicates part of the proceeds will satisfy taxes triggered by the vesting of the equity award.

Who is executing the planned MRCY stock sale on behalf of Douglas Munro?

The notice is signed by Jared Cook, a duly authorized representative of Fidelity Brokerage Services LLC, acting as attorney-in-fact for Douglas Munro. Fidelity serves as the broker for the planned Rule 144 sale of MRCY common stock.

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

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Accepted by SEC EDGAR 08/20/2026 - 03:27 PM EDT 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	109	10646.40	60136133	08/20/2026	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	08/19/2026	Restricted Stock Vesting	Issuer			109	08/19/2026	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
Douglas Munro 50 Minuteman Road Andover MA 01810	Common	08/18/2026	494	55010.70
Douglas Munro 50 Minuteman Road Andover MA 01810	Common	08/19/2026	548	54967.69

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	08/20/2026
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/ Jared Cook, 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)