Mercury Systems (NASDAQ: MRCY) plans $100K sale after August stock trades

Rhea-AI Filing Summary

MERCURY SYSTEMS INC (MRCY) is the issuer for which Steven Ratner filed a Rule 144 notice covering sales of common stock. The notice lists a proposed sale of 1,026 shares of MRCY common stock through Fidelity Brokerage Services LLC on 08/20/2026, with an aggregate market value of 100,212.91, to be sold on NASDAQ. These shares are reported as acquired through Restricted Stock Vesting from the issuer on 08/19/2026 in connection with compensation. The filing also reports sales during the prior three months totaling several thousand shares of common stock on three separate dates, with a portion of the current sale explicitly stated as covering tax obligations from the settlement of a vested equity award.

Key Figures

Shares to be sold: 1,026 shares Aggregate market value of proposed sale: 100,212.91 Acquisition date of shares to be sold: 08/19/2026 +4 more

7 metrics

Shares to be sold 1,026 shares Proposed sale of MRCY common stock via Fidelity on 08/20/2026

Aggregate market value of proposed sale 100,212.91 Market value for the 1,026 shares of MRCY common stock to be sold

Acquisition date of shares to be sold 08/19/2026 Shares acquired through Restricted Stock Vesting from issuer as compensation

Shares sold on 08/17/2026 1,084 shares Past 3-month sale of MRCY common stock for aggregate 119,186.78

Aggregate amount on 08/17/2026 sale 119,186.78 Value associated with sale of 1,084 shares of MRCY common stock

Shares sold on 08/18/2026 1,971 shares Past 3-month sale of MRCY common stock for aggregate 219,486.03

Shares sold on 08/19/2026 2,187 shares Past 3-month sale of MRCY common stock for aggregate 219,369.22

Key Terms

Rule 144, Restricted Stock Vesting, attorney-in-fact, tax obligation

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 | 08/19/2026 | 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.

attorney-in-fact regulatory

"as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Steven Ratner"

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.

tax obligation financial

"Sale includes an amount necessary to cover a tax obligation resulting from the settlement"

FAQ

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

The filing discloses a planned sale of 1,026 shares of Mercury Systems (MRCY) common stock on 08/20/2026 via Fidelity Brokerage Services LLC, with an aggregate market value of 100,212.91, under Rule 144 on NASDAQ.

How were the Mercury Systems (MRCY) shares in Steven Ratner's Form 144 acquired?

The Form 144 states the 1,026 shares to be sold were acquired through Restricted Stock Vesting on 08/19/2026 from Mercury Systems as part of compensation, indicating they come from an equity award that recently vested.

What past sales of MRCY stock are reported in Steven Ratner's Form 144?

The notice lists three prior sales of Mercury Systems common stock in the past three months: 1,084 shares on 08/17/2026, 1,971 shares on 08/18/2026, and 2,187 shares on 08/19/2026, each with six-figure aggregate sale amounts.

What monetary values are associated with Steven Ratner’s recent MRCY stock sales?

The prior three sales report aggregate amounts of 119,186.78 for 1,084 shares on 08/17/2026, 219,486.03 for 1,971 shares on 08/18/2026, and 219,369.22 for 2,187 shares on 08/19/2026, indicating substantial recent transaction values.

Does the MRCY Form 144 mention tax-related reasons for Steven Ratner’s stock sale?

Yes. The remarks explain that the sale includes an amount necessary to cover a tax obligation arising from the settlement of a vested equity award distribution, linking part of the transaction to tax withholding needs.

Who is executing the planned Mercury Systems (MRCY) stock sale for Steven Ratner?

The notice identifies Fidelity Brokerage Services LLC as the broker handling the proposed sale of 1,026 MRCY shares, with the Form 144 signed by Gary Redman as attorney-in-fact for Steven Ratner on behalf of Fidelity.

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

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Available on EDGAR 08/20/2026 - 03:18 PM Accepted by SEC EDGAR 08/20/2026 - 03:18 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	0001995110
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	Ratner Steven
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	1026	100212.91	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			1026	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
Steven Ratner 50 Minuteman Road Andover MA 01810	Common	08/17/2026	1084	119186.78
Steven Ratner 50 Minuteman Road Andover MA 01810	Common	08/18/2026	1971	219486.03
Steven Ratner 50 Minuteman Road Andover MA 01810	Common	08/19/2026	2187	219369.22

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/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Steven Ratner
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)