Mercury Systems
Builds secure processing electronics and integrated subsystems for aerospace and defense missions.
$88.54
After-hours close+0.04 (+0.04%)
At close$88.51(−2.17%)
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Breakdown13F · Form 4
Institutions 122.93%Insiders 8.11%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 60.04M · Float 55.53M · 92.5% free float
Institutions13F, as of Jun 30, 2026
407 holders · 73.81M shares · 87 new positions · 220 increased · 130 reduced · 49 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 9.37M | 15.61% | +450.6K | Aug 7, 2026 |
| Jana Partners Management, LP | 3.96M | 6.59% | −148.6K | Aug 14, 2026 |
| State Street Corp | 3.42M | 5.69% | −447.4K | Aug 7, 2026 |
| Vanguard Portfolio Management LLC | 3.03M | 5.05% | +120.6K | Aug 13, 2026 |
| Invesco Ltd. | 2.67M | 4.45% | +227.9K | Aug 14, 2026 |
| Vanguard Capital Management LLC | 2.42M | 4.03% | +18.8K | Aug 13, 2026 |
| FMR LLC | 1.84M | 3.07% | +938.4K | Aug 13, 2026 |
| T. Rowe Price Investment Management, Inc. | 1.60M | 2.66% | +15.9K | Aug 14, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 13.30% | 7.97M | 13G | Jul 17, 2025 ↗ |
| JANA Partners Management, LP | 6.90% | 4.11M | 13D | Mar 4, 2026 ↗ |
| State Street Corporation | 6.40% | 3.87M | 13G | May 12, 2026 ↗ |
| Vanguard Portfolio Management | 5.13% | 3.09M | 13G | Jul 31, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| JANA Partners Management, LP | director, other: See Remarks | 4.11M | 6.85% | Mar 4, 2026 |
| William L. Ballhaus | director, officer: Chairman, President & CEO | 361.8K | 0.60% | Aug 27, 2026 |
| David E. Farnsworth | officer: EVP, CFO | 118.0K | 0.20% | Aug 21, 2026 |
| Stuart Kupinsky | officer: EVP, CLO & Corp Sec | 56.4K | 0.09% | Aug 25, 2026 |
| Orlando D. Carvalho | director | 52.4K | 0.09% | May 13, 2026 |
| Barry R. Nearhos | director | 31.5K | 0.05% | Jul 20, 2026 |
| Lisa S. Disbrow | director | 31.2K | 0.05% | Oct 24, 2025 |
| Howard L. Lance | director | 27.3K | 0.05% | May 27, 2026 |
| Steven Ratner | officer: EVP, CHRO | 23.3K | 0.04% | Aug 25, 2026 |
| Gerard J. Demuro | director | 17.5K | 0.03% | Oct 24, 2025 |
1 ten-percent owner holds 11.9K shares by Form 4 — the 13D/G table above shows that stake, the figure above counts officers and directors only · 44 people have not refiled in the last 18 months (7.61M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 26, 2026 | William L. Ballhausdirector, officer: Chairman, President & CEO | Sale · 2 lots | 49,090 | $89.10 | 361,822 |
| Aug 25, 2026 | William L. Ballhausdirector, officer: Chairman, President & CEO | Sale · 2 lots | 111,076 | $87.12 | 342,436 |
| Aug 21, 2026 | Steven Ratnerofficer: EVP, CHRO | Sale | 356 | $91.36 | 0 |
| Aug 24, 2026 | William L. Ballhausdirector, officer: Chairman, President & CEO | Sale · 2 lots | 108,209 | $89.50 | 299,836 |
| Aug 21, 2026 | William L. Ballhausdirector, officer: Chairman, President & CEO | Sale · 2 lots | 65,000 | $92.41 | 256,047 |
| Aug 21, 2026 | Stuart Kupinskyofficer: EVP, CLO & Corp Sec | Sale | 1,000 | $95.23 | 56,352 |
| Aug 20, 2026 | Douglas Munroofficer: SVP, CAO | Sale | 109 | $97.67 | 12,982 |
| Aug 19, 2026 | Douglas Munroofficer: SVP, CAO | Sale | 548 | $100.31 | 13,091 |
| Aug 20, 2026 | William L. Ballhausdirector, officer: Chairman, President & CEO | Sale | 22,010 | $97.67 | 228,197 |
| Aug 19, 2026 | William L. Ballhausdirector, officer: Chairman, President & CEO | Sale | 26,802 | $100.31 | 250,207 |
CongressHouse and Senate disclosures
Not reported.