Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Oct 16, 2026.
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Counts cover the 22 most recent Form 4 filings Tradune holds for MRCY (filed Jul 20 – Oct 16, 2026); the score below covers only the trailing 90 days (0 buys, 31 sells). No completed check of MRCY's Form 4 list on SEC EDGAR is on record yet; the latest MRCY filing Tradune holds was filed Oct 16, 2026. This is not guaranteed to be the complete record — see MRCY's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 21 filings Tradune holds for MRCY filed Aug 18 – Oct 16, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
Open-market purchases and sales by insider
Insider
Buys
Sells
Shares bought
Shares sold
Value
William L. BallhausChairman, President & CEO
0
12
—
409,867
−$37,657,295
Steven RatnerEVP, CHRO
0
6
—
10,624
−$1,028,809
Stuart KupinskyEVP, CLO & Corp Sec
0
5
—
5,681
−$575,521
David E. FarnsworthEVP, CFO
0
4
—
23,459
−$2,429,841
Douglas MunroSVP, CAO
0
4
—
1,555
−$165,045
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Insider-activity score
0/ 100
Net insider sales
0 distinct buyers0 buy · 31 sell tx
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying.
“Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at MRCY
No open-market insider purchases (Form 4 code P) were reported for MRCY between Jul 20, 2026 and Oct 16, 2026. The filings below may include other transaction types — sales, grants, option exercises, and tax withholding — shown for completeness; they are not open-market purchases.
† change in this filer’s own reported holding line (Form 4 Table I, col. 5), not of total company ownership; small prior holdings produce large percentages, so under 100 shares the prior holding is shown instead.
“10b5-1 box checked” = the filer checked the Form 4 box stating that a transaction on the filing was made under a plan intended to satisfy Rule 10b5-1(c); “10b5-1 box not checked” = the box was left blank, which does not prove that no plan exists. The box applies to Form 4s filed from April 1, 2023; older filings, and boxes we could not read, carry no tag. What the 10b5-1 box means.
How many insiders bought MRCY stock in these Form 4 filings?
No open-market purchases (Form 4 code P) of MRCY shares were reported by Mercury Systems Inc insiders between Jul 20, 2026 and Oct 16, 2026. The 22 filings shown on this page cover other transaction types — sales, grants, option exercises, and tax withholding.
Who filed the most recent Form 4 for MRCY?
The most recent Form 4 on this page was filed by Barry R. Nearhos (Director) on Oct 16, 2026, reporting 1 transaction. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market MRCY insider sale shown?
The largest open-market sale among the filings shown was 105,471 MRCY shares at $89.47 (about $9,436,807) by William L. Ballhaus (Chairman, President & CEO) on Aug 24, 2026. Value is shares × the price reported on the Form 4; its Rule 10b5-1 box is not checked.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.