Mercury Systems (MRCY) Rule 144 Notice: 1,220 Shares from Vesting

Rhea-AI Filing Summary

Mercury Systems, Inc. (MRCY) Form 144 shows a proposed sale of 1,220 common shares with an aggregate market value of $78,645.84. The shares were acquired on 08/18/2025 through restricted stock vesting and are designated for sale on or about 08/19/2025 on NASDAQ.

The filing lists 59,915,670 shares outstanding, and identifies a related recent sale: Stuart Kupinsky sold 1,182 common shares on 08/18/2025 for gross proceeds of $78,622.27. The notice includes the standard certification that the seller does not possess undisclosed material adverse information.

Positive

• Rule 144 compliance: The filer provided a formal notice for the proposed sale, supporting regulatory transparency.
• Clear acquisition source: Shares were acquired via restricted stock vesting (compensation), which explains the timing of the sale.

Negative

• None.

Insights

Securities Analyst

TL;DR: Routine insider sale of newly vested compensation shares; size is negligible versus outstanding shares.

The filing discloses a proposed Rule 144 sale of 1,220 shares ($78.6K) acquired via restricted stock vesting one day earlier. With 59,915,670 shares outstanding, the position represents approximately 0.002% of the float, indicating minimal direct market impact. The contemporaneous sale by Stuart Kupinsky of 1,182 shares for $78,622.27 suggests rapid disposition of vested shares, consistent with compensation-related liquidity rather than a strategic stake change.

Corporate Governance Expert

TL;DR: Disclosure aligns with compliance expectations; provides transparency on insider compensation and sale timing.

The Form 144 properly reports acquisition via restricted stock vesting and planned sale under Rule 144, meeting regulatory disclosure requirements. The filing includes the issuer share count and explicit representation about material nonpublic information. There is no indication of extraordinary executive action or material governance concern from the disclosed transaction alone.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	1220	78645.84	59915670	08/19/2025	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	08/18/2025	Restricted Stock Vesting	Issuer			1220	08/18/2025	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
Stuart Kupinsky 50 Minuteman Road Andover MA 01810	Common	08/18/2025	1182	78622.27

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What did the Form 144 filed for MRCY disclose?

The filing discloses a proposed sale of 1,220 common shares (aggregate market value $78,645.84) to be sold on or about 08/19/2025 on NASDAQ.

How were the shares to be sold acquired?

The shares were acquired on 08/18/2025 through restricted stock vesting and the payment nature is listed as compensation.

How many shares does Mercury Systems have outstanding according to the filing?

The filing reports 59,915,670 shares outstanding.

Did the filing report recent related sales by insiders?

Yes. It reports Stuart Kupinsky sold 1,182 common shares on 08/18/2025 for gross proceeds of $78,622.27.

Does the filing state whether the seller has undisclosed material information?

Yes. By signing, the person represents they do not know any material adverse information about the issuer that has not been publicly disclosed.