Mercury Systems insider plans sale of 8,155 shares

MERCURY SYSTEMS INC (MRCY) insider David E. Farnsworth filed a notice of proposed sale of common stock under Rule 144.

Rhea-AI Filing Summary

MERCURY SYSTEMS INC (MRCY) insider David E. Farnsworth filed a notice of proposed sale of common stock under Rule 144. The notice covers 8,155 shares held at Fidelity Brokerage Services, with a stated value of 817995.43, and references prior sales over the past three months. The filing notes that part of the sale is intended to cover tax obligations arising from the settlement of a vested equity award distribution.

Key Figures

Shares proposed for sale: 8155 shares Value of shares proposed for sale: 817995.43 Shares sold on 08/17/2026: 1345 shares +4 more

7 metrics

Shares proposed for sale 8155 shares Common stock to be sold under Rule 144

Value of shares proposed for sale 817995.43 Value associated with 8,155 common shares

Shares sold on 08/17/2026 1345 shares Common shares sold during past 3 months

Value of shares sold on 08/17/2026 147883.96 Value for 1,345 common shares sold

Shares sold on 08/18/2026 7347 shares Common shares sold during past 3 months

Value of shares sold on 08/18/2026 818145.03 Value for 7,347 common shares sold

Date of notice 08/19/2026 Date the Rule 144 notice was signed

Key Terms

Rule 144, Restricted Stock Vesting, vested equity award distribution, attorney-in-fact

4 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 | 08/18/2026 | 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."

attorney-in-fact regulatory

"as attorney-in-fact for David E. Farnsworth"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

What insider transaction in MRCY stock did David E. Farnsworth report?

David E. Farnsworth reported a proposed sale of 8,155 MRCY common shares under Rule 144. The shares are held at Fidelity Brokerage Services, and part of the sale is intended to cover tax obligations from a vested equity award distribution.

What is the reported market value of the MRCY shares proposed for sale?

The filing lists a value of 817995.43 for the 8,155 MRCY common shares proposed for sale. These shares are listed on NASDAQ, and the transaction is reported in connection with restricted stock vesting on 08/18/2026.

What prior MRCY stock sales by David E. Farnsworth are disclosed in this Form 144?

The notice discloses two prior sales: 1,345 shares on 08/17/2026 valued at 147883.96 and 7,347 shares on 08/18/2026 valued at 818145.03. These transactions are reported as sales during the past three months.

What is the relationship between the MRCY share sale and tax obligations?

The filing states that the sale includes an amount necessary to cover a tax obligation arising from settlement of a vested equity award distribution. This links the proposed sale to tax liabilities triggered by restricted stock vesting.

When do the MRCY restricted shares vest and when is the sale notice dated?

The restricted stock vesting date is listed as 08/18/2026, and the notice of proposed sale is dated 08/19/2026. These dates frame the timing of the equity award settlement and the related Rule 144 sale notice.

Who is executing the proposed MRCY stock sale on behalf of David E. Farnsworth?

The notice is signed by /s/ Wade Moss as a duly authorized representative of Fidelity Brokerage Services LLC, acting as attorney-in-fact for David E. Farnsworth in connection with the proposed MRCY stock sale.

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

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Accepted by SEC EDGAR 08/19/2026 - 04:50 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	0001990150
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	Farnsworth David E.
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	8155	817995.43	60136133	08/19/2026	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	08/18/2026	Restricted Stock Vesting	Issuer			8155	08/18/2026	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
David E. Farnsworth 50 Minuteman Road Andover MA 01810	Common	08/17/2026	1345	147883.96
David E. Farnsworth 50 Minuteman Road Andover MA 01810	Common	08/18/2026	7347	818145.03

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	08/19/2026
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/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for David E. Farnsworth
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)