Mercury Systems holder plans sale of 2,187 shares

Rhea-AI Filing Summary

MERCURY SYSTEMS INC (MRCY) is the issuer for which Steven V. Ratner has filed a Rule 144 notice covering a proposed sale of 2,187 common shares, held at Fidelity Brokerage Services LLC and valued at $219,369.22, with an anticipated sale date of August 19, 2026 on NASDAQ. The shares arise from restricted stock vesting on August 18, 2026 as compensation, and the filer notes that the sale includes shares to cover a tax obligation from settlement of a vested equity award distribution. In the prior three months, Ratner sold 1,084 shares for $119,186.78 on August 17, 2026 and 1,971 shares for $219,486.03 on August 18, 2026.

Key Figures

Planned shares to be sold: 2,187 shares Planned sale value: $219,369.22 Shares sold on August 17, 2026: 1,084 shares +4 more

7 metrics

Planned shares to be sold 2,187 shares Common stock proposed for sale under Rule 144 around August 19, 2026

Planned sale value $219,369.22 Market value of 2,187 common shares covered by the notice

Shares sold on August 17, 2026 1,084 shares Common stock sold by Steven V. Ratner in the past three months

Value of August 17, 2026 sale $119,186.78 Aggregate value of 1,084 common shares sold

Shares sold on August 18, 2026 1,971 shares Common stock sold by Steven V. Ratner in the past three months

Value of August 18, 2026 sale $219,486.03 Aggregate value of 1,971 common shares sold

Restricted stock vesting date 08/18/2026 Date the compensation-related restricted stock vested

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

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

attorney-in-fact regulatory

"as attorney-in-fact for Steven V. 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.

FAQ

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

What does the Form 144 filing mean for MERCURY SYSTEMS INC (MRCY)?

The Form 144 indicates that Steven V. Ratner plans to sell 2,187 MRCY common shares under Rule 144. These shares come from restricted stock vesting and include an amount sold to cover related tax obligations.

How many MRCY shares does Steven V. Ratner plan to sell under this Form 144?

Steven V. Ratner plans to sell 2,187 MRCY common shares. The planned sale, valued at $219,369.22, is expected to occur around August 19, 2026 through Fidelity Brokerage Services LLC on NASDAQ.

What is the value of the MRCY shares covered by the new Form 144 notice?

The Form 144 notice covers MRCY common shares valued at $219,369.22. This value relates to the 2,187 shares proposed for sale and reflects the market value used in the Rule 144 disclosure.

What prior MRCY share sales has Steven V. Ratner reported in the last three months?

In the last three months, Steven V. Ratner reported selling 1,084 MRCY shares for $119,186.78 on August 17, 2026 and 1,971 shares for $219,486.03 on August 18, 2026 under Rule 144 reporting requirements.

Why does the Form 144 mention tax obligations for Steven V. Ratner’s MRCY share sale?

The notice states the sale includes shares to cover a tax obligation from settlement of a vested equity award. This means part of the 2,187 shares from restricted stock vesting is being sold to satisfy related tax liabilities.

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

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Accepted by SEC EDGAR 08/19/2026 - 04:41 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	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	2187	219369.22	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			2187	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
Steven V. Ratner 50 Minuteman Road Andover MA 01810	Common	08/17/2026	1084	119186.78
Steven V. Ratner 50 Minuteman Road Andover MA 01810	Common	08/18/2026	1971	219486.03

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