Company · Ownership research

MERCURY SYSTEMS INC MRCY

CIK 0001049521

Form 4 transactions dated Nov 1, 2023 to Nov 10, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

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 ·

202510 of 26 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Nov 12, 2025	Munro Douglas SVP, CAO	Sale	$97.57K 1,329 shares sold	8.30% sold Direct holding	▾
Nov 7, 2025	Plunkett Debora A Director	Sale	$125.78K 1,700 shares sold	9.17% sold Direct holding	▾
Nov 6, 2025	JANA Partners Management, LP Director · See Remarks	Sale	$75.45M 1,000,000 shares sold	16.76% sold Indirect holding	▾
Sep 16, 2025	Munro Douglas VP, CAO	Sale	$4.92K 67 shares sold	0.42% sold Direct holding	▾
Aug 20, 2025	Ratner Steven EVP, CHRO	Sale	$446.31K 7,000 shares sold	17.16% sold Direct holding	▾
Aug 19, 2025	Munro Douglas VP, CAO	Sale	$24.24K 376 shares sold	2.29% sold Direct holding	▾
Aug 19, 2025	Ratner Steven EVP, CHRO	Sale	$111.85K 1,735 shares sold	4.08% sold Direct holding	▾
Aug 19, 2025	KUPINSKY STUART EVP, CLO & Corp Sec	Sale	$78.65K 1,220 shares sold	1.71% sold Direct holding	▾
Aug 19, 2025	Farnsworth David E. EVP, CFO	Sale	$488.12K 7,572 shares sold	4.48% sold Direct holding	▾
Aug 19, 2025	Ballhaus William L Chairman, President & CEO · Director	Sale	$841.26K 13,050 shares sold	3.36% sold Direct holding	▾

Showing 26 / 26 record groups in 2025. 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 26 of 26 purchase / sale groups and 21 of 21 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.