Mercury Systems's top three insider shareholders as of September 29, 2026 are Partners Management, Lp Jana (Director, 6.55Mn shares), Partners Management, Lp Jana (Director, 5.97Mn shares), Partners Llc Jana (Director, 4.71Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Partners Management, Lp Jana | Director, Other | 0 | 13,065,458 | 13,065,458 | 65.0% | 04 Mar, 2026 |
| 2 | Partners Llc Jana | Director, Other | 0 | 4,711,386 | 4,711,386 | 23.4% | 22 Aug, 2023 |
| 3 | Mark Aslett | President And Ceo | 508,858 | 0 | 508,858 | 2.5% | 23 Feb, 2023 |
| 4 | William L Ballhaus | Chairman, President Ceo | 361,822 | 0 | 361,822 | 1.8% | 27 Aug, 2026 |
| 5 | Michael Ruppert | Evp, Cfo And Treasurer | 202,553 | 0 | 202,553 | 1.0% | 21 Feb, 2023 |
| 6 | Christopher C Cambria | Evp, Gen Counsel Secretary | 135,721 | 0 | 135,721 | 0.7% | 26 Sep, 2023 |
| 7 | David E. Farnsworth | Evp, Cfo | 117,967 | 0 | 117,967 | 0.6% | 21 Aug, 2026 |
| 8 | Charles Roger Iv Wells | Evp, Coo | 95,928 | 0 | 95,928 | 0.5% | 19 Feb, 2025 |
| 9 | Brian E Perry | Evp, President Processing | 87,913 | 0 | 87,913 | 0.4% | 22 Aug, 2022 |
| 10 | James Mitch Stevison | Evp, President Mission Systems | 86,385 | 0 | 86,385 | 0.4% | 17 Oct, 2023 |
| 11 | Michael A Daniels | Director | 81,366 | 0 | 81,366 | 0.4% | 29 Oct, 2021 |
| 12 | James Bass | Director | 67,634 | 0 | 67,634 | 0.3% | 29 Oct, 2021 |
| 13 | Thomas Huber | Evp Chief Transformation Offic | 66,489 | 0 | 66,489 | 0.3% | 23 Feb, 2023 |
| 14 | Allen Couture | Evp, Execution Excellence | 65,222 | 0 | 65,222 | 0.3% | 19 Oct, 2023 |
| 15 | Stuart Kupinsky | Evp, Clo Corp Sec | 60,971 | 0 | 60,971 | 0.3% | 23 Sep, 2026 |
| 16 | Orlando D Carvalho | Director | 52,448 | 0 | 52,448 | 0.3% | 13 May, 2026 |
| 17 | Christine Fox Harbison | Evp And Chief Growth Officer | 52,220 | 0 | 52,220 | 0.3% | 21 Aug, 2023 |
| 18 | Michelle M Mccarthy | Svp, Cao | 32,724 | 0 | 32,724 | 0.2% | 21 Dec, 2023 |
| 19 | Stephanie Georges | Evp, Cco | 32,259 | 0 | 32,259 | 0.2% | 21 Aug, 2024 |
| 20 | Barry R Nearhos | Director | 31,494 | 0 | 31,494 | 0.2% | 20 Jul, 2026 |
| 21 | Lisa S Disbrow | Director | 31,236 | 0 | 31,236 | 0.2% | 24 Oct, 2025 |
| 22 | Howard L Lance | Director | 27,272 | 0 | 27,272 | 0.1% | 27 Feb, 2026 |
| 23 | Mary L Krakauer | Director | 19,360 | 0 | 19,360 | 0.1% | 28 Oct, 2022 |
| 24 | Steven Ratner | Evp, Chro | 19,275 | 0 | 19,275 | 0.1% | 08 Sep, 2026 |
| 25 | Gerard J Demuro | Director | 17,481 | 0 | 17,481 | 0.1% | 24 Oct, 2025 |
| 26 | Debora A Plunkett | Director | 16,833 | 0 | 16,833 | 0.1% | 10 Nov, 2025 |
| 27 | Roger A Krone | Director | 15,311 | 0 | 15,311 | 0.1% | 25 Oct, 2024 |
| 28 | William K Obrien | Director | 13,100 | 0 | 13,100 | 0.1% | 28 Oct, 2022 |
| 29 | Douglas Munro | Svp, Cao | 12,982 | 0 | 12,982 | 0.1% | 21 Aug, 2026 |
| 30 | Jean A Bua | Director | 7,815 | 0 | 7,815 | 0.0% | 24 Oct, 2025 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 21 Sep, 2026 | Stuart Kupinsky | Evp, Clo Corp Sec | Disposed S | 1,000 | $86.52 | $86.52K | 60,971 | Direct |
| 03 Sep, 2026 | Steven Ratner | Evp, Chro | Disposed S | 4,000 | $84.51 | $338.03K | 19,275 | Direct |
| 25 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Acquired M | 153,676 | $43.00 | $6.61Mn | 453,512 | Direct |
| 25 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed S | 107,628 | $87.09 | $9.37Mn | 345,884 | Direct |
| 25 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed S | 3,448 | $87.99 | $303.40K | 342,436 | Direct |
| 26 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Acquired M | 68,476 | $43.00 | $2.94Mn | 410,912 | Direct |
| 26 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed S | 38,276 | $88.91 | $3.40Mn | 372,636 | Direct |
| 26 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed S | 10,814 | $89.74 | $970.49K | 361,822 | Direct |
| 25 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed M | 153,676 | $0.00 | $0 | 68,476 | Direct |
| 26 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed M | 68,476 | $0.00 | $0 | 0 | Direct |
| 21 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Acquired M | 92,850 | $42.00 | $3.90Mn | 321,047 | Direct |
| 21 Aug, 2026 | Steven Ratner | Evp, Chro | Disposed S | 356 | $91.36 | $32.52K | 0 | Indirect |
| 21 Aug, 2026 | Stuart Kupinsky | Evp, Clo Corp Sec | Disposed S | 1,000 | $95.23 | $95.23K | 56,352 | Direct |
| 21 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed S | 64,796 | $92.40 | $5.99Mn | 256,251 | Direct |
| 21 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed S | 204 | $93.51 | $19.08K | 256,047 | Direct |
| 24 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Acquired M | 140,650 | $42.00 | $5.91Mn | 396,697 | Direct |
| 24 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Acquired M | 11,348 | $43.00 | $487.96K | 408,045 | Direct |
| 24 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed S | 105,471 | $89.47 | $9.44Mn | 302,574 | Direct |
| 24 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed S | 2,738 | $90.60 | $248.06K | 299,836 | Direct |
| 21 Aug, 2026 | William L Ballhaus | Chairman, President Ceo | Disposed M | 92,850 | $0.00 | $0 | 140,650 | Direct |