Company · Ownership research

MERCURY SYSTEMS INC MRCY

CIK 0001049521

Form 4 transactions dated Nov 1, 2023 to Nov 8, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 37 rows; the complete set is available through the API.

Insider filings on file run through Oct 30, 2026.

Insider purchases & sales

Purchased: $67.53M
Sold: $260.13M

Nov 1, 2023 – Oct 30, 2026
Available records · partial months are marked ·

202610 of 30 preview events · 37 available in 2026

Date	Insider	Activity	Trade value (USD)	% of prior holding
Oct 21, 2026	KUPINSKY STUART EVP, CLO & Corp Sec	Sale10b5-1 footnote	$76.00K 1,000 shares sold	1.64% sold Direct holding	▾
Sep 21, 2026	KUPINSKY STUART EVP, CLO & Corp Sec	Sale10b5-1 footnote	$86.52K 1,000 shares sold	1.61% sold Direct holding	▾
Sep 3, 2026	Ratner Steven EVP, CHRO	Sale	$338.03K 4,000 shares sold	17.19% sold Direct holding	▾
Aug 26, 2026	Ballhaus William L Chairman, President & CEO · Director	Sale	$4.37M 49,090 shares sold	11.95% sold Direct holding	▾
Aug 25, 2026	Ballhaus William L Chairman, President & CEO · Director	Sale	$9.68M 111,076 shares sold	24.49% sold Direct holding	▾
Aug 24, 2026	Ballhaus William L Chairman, President & CEO · Director	Sale	$9.68M 108,209 shares sold	26.52% sold Direct holding	▾
Aug 21, 2026	Ratner Steven EVP, CHRO	Sale	$32.52K 356 shares sold	100.00% sold Indirect holding	▾
Aug 21, 2026	KUPINSKY STUART EVP, CLO & Corp Sec	Sale10b5-1 footnote	$95.23K 1,000 shares sold	1.74% sold Direct holding	▾
Aug 21, 2026	Ballhaus William L Chairman, President & CEO · Director	Sale	$6.01M 65,000 shares sold	20.25% sold Direct holding	▾
Aug 20, 2026	Munro Douglas SVP, CAO	Sale	$10.65K 109 shares sold	0.83% sold Direct holding	▾

Showing 30 / 37 record groups in 2026. The complete set is available through the API.

MERCURY SYSTEMS INC · MRCY

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 30 of 37 purchase / sale groups and 27 of 27 other groups; the totals and the monthly series cover the whole window.

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{"action":"list","ticker":"MRCY","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Share totals are on today's split-adjusted basis. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.