MRCYNasdaqElectronic Components & AccessoriesFiscal year ends June 30
MERCURY SYSTEMS INC
Financials through Q4 FY2026, quarter ended Jul 3, 2026Last filing: 10-K on Aug 18, 2026
$75.99+1.72 (+2.32%)
Close on Oct 19, 2026
- Market cap
- $4.54B
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
100.0%
66M of 60M shares
Institutional holders
392
86 new, 44 sold out
Net institutional buying
1M
In Q2 2026
Insider trades, 12 months
0 buys · 46 sales
Net sold $194.05M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| BlackRock, Inc. | 8,619,527 | 14.40% | 13G (passive) amendment | Jun 30, 2026 |
| JANA Partners Management, LP | 4,114,618 | 6.90% | 13D (active) amendment | Mar 3, 2026 |
| State Street Corporation | 3,865,719 | 6.40% | 13G (passive) | Mar 31, 2026 |
| Vanguard Portfolio Management | 3,086,142 | 5.13% | 13G (passive) | Jun 30, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of MRCY | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| BlackRock, Inc. | 9,370,902 | 15.58% | $1.15B | +450,577 | 0.02% |
| JANA Partners Management, LP | 3,958,849 | 6.58% | $484.29M | −148,575 | 25.46% |
| State Street Corp | 3,418,290 | 5.68% | $418.05M | −447,429 | 0.01% |
| Vanguard Portfolio Management LLC | 3,031,459 | 5.04% | $370.84M | +120,555 | 0.02% |
| Invesco Ltd. | 2,669,450 | 4.44% | $326.55M | +227,872 | 0.03% |
| Vanguard Capital Management LLC | 2,422,629 | 4.03% | $296.36M | +18,811 | 0.01% |
| FMR LLC | 1,842,103 | 3.06% | $225.34M | +938,435 | 0.01% |
| T. Rowe Price Investment Management, Inc. | 1,595,711 | 2.65% | $195.20K | +15,879 | 0.13% |
| Goldman Sachs Group Inc | 1,575,727 | 2.62% | $192.76M | +374,615 | 0.02% |
| Conestoga Capital Advisors, LLC | 1,487,191 | 2.47% | $181.93M | −431,400 | 3.96% |
| Geode Capital Management, LLC | 1,459,574 | 2.43% | $178.58M | −66,142 | 0.01% |
| First Trust Advisors LP | 1,298,957 | 2.16% | $158.90M | +138,182 | 0.09% |
| Price T Rowe Associates Inc /Md/ | 1,285,569 | 2.14% | $157.26K | +256,960 | 0.02% |
| Dimensional Fund Advisors LP | 1,156,682 | 1.92% | $141.44M | −71,293 | 0.03% |
| Segall Bryant & Hamill, LLC | 1,029,491 | 1.71% | $125.94M | +94,667 | 1.49% |
| Fisher Asset Management, LLC | 944,069 | 1.57% | $115.49M | −36,298 | 0.03% |
| Franklin Resources Inc | 846,732 | 1.41% | $103.58M | +393,099 | 0.02% |
| Neuberger Berman Group LLC | 841,556 | 1.40% | $102.07M | −68,862 | 0.07% |
| Morgan Stanley | 811,565 | 1.35% | $99.28M | +140,234 | 0.01% |
| Wellington Management Group Llp | 775,502 | 1.29% | $94.87M | +19,977 | 0.02% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 392 | 66M | 100.0% | 86 / 128 | 132 / 44 | 6M | 5M |
| Q1 2026 | 357 | 65M | 100.0% | 58 / 133 | 121 / 42 | 12M | 6M |
| Q4 2025 | 347 | 65M | 100.0% | 55 / 128 | 112 / 31 | 7M | 7M |
| Q3 2025 | 326 | 65M | 100.0% | 69 / 108 | 109 / 26 | 8M | 9M |
| Q2 2025 | 285 | 66M | 100.0% | 56 / 116 | 74 / 22 | 8M | 6M |
| Q1 2025 | 253 | 63M | 100.0% | 45 / 81 | 90 / 31 | 5M | 5M |
| Q4 2024 | 243 | 63M | 100.0% | 30 / 83 | 88 / 27 | 6M | 5M |
| Q3 2024 | 245 | 63M | 100.0% | 37 / 76 | 92 / 23 | 14M | 7M |
| Q2 2024 | 232 | 65M | 100.0% | 36 / 92 | 78 / 25 | 6M | 4M |
| Q1 2024 | 222 | 63M | 100.0% | 45 / 87 | 68 / 41 | 9M | 7M |
| Q4 2023 | 219 | 61M | 100.0% | 30 / 86 | 75 / 25 | 5M | 4M |
| Q3 2023 | 216 | 60M | 99.4% | 34 / 95 | 63 / 52 | 15M | 7M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of MRCY | Value | % of fund | As of |
|---|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 3,183,204 | 5.29% | $389.40M | 0.35% | Jun 30, 2026 |
| Vanguard Total Stock Market Index Fund | 1,716,224 | 2.85% | $209.95M | 0.01% | Jun 30, 2026 |
| iShares Russell 2000 ETF | 1,447,349 | 2.41% | $177.05M | 0.21% | Jun 30, 2026 |
| Vanguard Small-Cap Index Fund | 1,239,792 | 2.06% | $151.66M | 0.08% | Jun 30, 2026 |
| State Street(R) SPDR(R) S&P(R) Aerospace & Defense ETF | 1,188,665 | 1.98% | $145.41M | 2.25% | Jun 30, 2026 |
| First Trust RBA American Industrial Renaissance ETF | 1,168,563 | 1.94% | $142.95M | 1.24% | Jun 30, 2026 |
| Invesco Discovery Fund | 1,123,320 | 1.87% | $125.47M | 1.60% | May 31, 2026 |
| Global X Defense Tech ETF | 806,674 | 1.34% | $90.11M | 1.13% | May 31, 2026 |
| T. Rowe Price New Horizons Fund, Inc. | 776,269 | 1.29% | $94.96M | 0.65% | Jun 30, 2026 |
| Vanguard Small-Cap Growth Index Fund | 714,893 | 1.19% | $87.45M | 0.19% | Jun 30, 2026 |
| Conestoga Small Cap Fund | 684,463 | 1.14% | $83.73M | 4.10% | Jun 30, 2026 |
| Invesco S&P SmallCap Momentum ETF | 679,443 | 1.13% | $65.97M | 2.17% | Jul 31, 2026 |
| Select Defense and Aerospace Portfolio | 658,000 | 1.09% | $73.50M | 1.90% | May 31, 2026 |
| Select Fund | 627,700 | 1.04% | $60.95M | 1.00% | Jul 31, 2026 |
| Fidelity Small Cap Index Fund | 616,583 | 1.03% | $59.87M | 0.18% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| William L. Ballhaus | Chairman, President & CEO, Director | 333,252 | 0.55% | Sep 15, 2026 |
| Stuart Kupinsky | EVP, CLO & Corp Sec | 62,252 | 0.10% | Sep 23, 2026 |
| Douglas Munro | SVP, CAO | 17,374 | 0.03% | Sep 15, 2026 |
| David E. Farnsworth | EVP, CFO | 149,809 | 0.25% | Sep 15, 2026 |
| Steven Ratner | EVP, CHRO | 34,002 | 0.06% | Sep 15, 2026 |
| Charles Roger Wells IV | EVP, COO | 97,226 | 0.16% | Feb 19, 2025 |
| Barry R. Nearhos | Director | 34,994 | 0.06% | Jul 20, 2026 |
| Howard L. Lance | Director | 27,272 | 0.05% | May 27, 2026 |
| Orlando D. Carvalho | Director | 52,448 | 0.09% | May 13, 2026 |
| JANA Partners Management, LP | Director | 4,114,618 | 6.84% | Mar 4, 2026 |
| Debora A. Plunkett | Director | 16,833 | 0.03% | Nov 10, 2025 |
| Jean A. Bua | Director | 7,815 | 0.01% | Oct 24, 2025 |
| Gerard J. Demuro | Director | 17,481 | 0.03% | Oct 24, 2025 |
| Lisa S. Disbrow | Director | 31,236 | 0.05% | Oct 24, 2025 |
| Roger A. Krone | Director | 30,311 | 0.05% | Oct 25, 2024 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Stuart Kupinsky EVP, CLO & Corp Sec | Sep 21, 2026 | Sale(10b5-1 plan) | −1,000 | $86.52 | $86.52K | 60,971 |
| Steven Ratner EVP, CHRO | Sep 3, 2026 | Sale | −4,000 | $84.51 | $338.04K | 19,275 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 26, 2026 | Option exercise | +68,476 | $43.00 | $2.94M | 410,912 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 26, 2026 | Sale | −38,276 | $88.91 | $3.40M | 372,636 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 26, 2026 | Sale | −10,814 | $89.74 | $970.45K | 361,822 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 25, 2026 | Option exercise | +153,676 | $43.00 | $6.61M | 453,512 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 25, 2026 | Sale | −107,628 | $87.09 | $9.37M | 345,884 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 25, 2026 | Sale | −3,448 | $87.99 | $303.39K | 342,436 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 24, 2026 | Option exercise | +140,650 | $42.00 | $5.91M | 396,697 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 24, 2026 | Option exercise | +11,348 | $43.00 | $487.96K | 408,045 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 24, 2026 | Sale | −2,738 | $90.60 | $248.06K | 299,836 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 24, 2026 | Sale | −105,471 | $89.47 | $9.44M | 302,574 |
| Steven Ratner EVP, CHRO | Aug 21, 2026 | Sale | −356 | $91.36 | $32.52K | 0 |
| Stuart Kupinsky EVP, CLO & Corp Sec | Aug 21, 2026 | Sale(10b5-1 plan) | −1,000 | $95.23 | $95.23K | 56,352 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 21, 2026 | Option exercise | +92,850 | $42.00 | $3.90M | 321,047 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 21, 2026 | Sale | −204 | $93.51 | $19.08K | 256,047 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 21, 2026 | Sale | −64,796 | $92.40 | $5.99M | 256,251 |
| Steven Ratner EVP, CHRO | Aug 20, 2026 | Sale | −1,026 | $97.67 | $100.21K | 23,275 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 20, 2026 | Sale | −22,010 | $97.67 | $2.15M | 228,197 |
| Douglas Munro SVP, CAO | Aug 20, 2026 | Sale | −109 | $97.67 | $10.65K | 12,982 |
| David E. Farnsworth EVP, CFO | Aug 20, 2026 | Sale | −6,612 | $97.67 | $645.79K | 117,967 |
| Steven Ratner EVP, CHRO | Aug 19, 2026 | Sale | −2,187 | $100.31 | $219.38K | 24,301 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 19, 2026 | Sale | −26,802 | $100.31 | $2.69M | 250,207 |
| Stuart Kupinsky EVP, CLO & Corp Sec | Aug 19, 2026 | Sale | −1,308 | $100.31 | $131.21K | 57,352 |
| Douglas Munro SVP, CAO | Aug 19, 2026 | Sale | −548 | $100.31 | $54.97K | 13,091 |
| David E. Farnsworth EVP, CFO | Aug 19, 2026 | Sale | −8,155 | $100.31 | $818.03K | 124,579 |
| Steven Ratner EVP, CHRO | Aug 18, 2026 | Sale | −1,971 | $111.36 | $219.49K | 26,488 |
| Stuart Kupinsky EVP, CLO & Corp Sec | Aug 18, 2026 | Sale | −1,178 | $111.36 | $131.18K | 58,660 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 18, 2026 | Sale | −24,144 | $111.36 | $2.69M | 277,009 |
| David E. Farnsworth EVP, CFO | Aug 18, 2026 | Sale | −7,347 | $111.36 | $818.16K | 132,734 |
| Douglas Munro SVP, CAO | Aug 18, 2026 | Sale | −494 | $111.36 | $55.01K | 13,639 |
| Douglas Munro SVP, CAO | Aug 17, 2026 | Award | +2,882 | – | – | 17,015 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 17, 2026 | Award | +23,629 | – | – | 324,782 |
| David E. Farnsworth EVP, CFO | Aug 17, 2026 | Award | +8,212 | – | – | 148,293 |
| Stuart Kupinsky EVP, CLO & Corp Sec | Aug 17, 2026 | Award | +5,619 | – | – | 65,457 |
| Steven Ratner EVP, CHRO | Aug 17, 2026 | Award | +5,187 | – | – | 33,646 |
| Steven Ratner EVP, CHRO | Aug 17, 2026 | Sale | −1,084 | $109.95 | $119.19K | 28,459 |
| Stuart Kupinsky EVP, CLO & Corp Sec | Aug 17, 2026 | Sale | −1,195 | $109.95 | $131.39K | 59,838 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 17, 2026 | Sale | −3,536 | $109.95 | $388.78K | 301,153 |
| David E. Farnsworth EVP, CFO | Aug 17, 2026 | Sale | −1,345 | $109.95 | $147.88K | 140,081 |
| Douglas Munro SVP, CAO | Aug 17, 2026 | Sale | −404 | $109.95 | $44.42K | 14,133 |
| Steven Ratner EVP, CHRO | Aug 14, 2026 | Returned to company | −2,695 | – | – | 29,543 |
| David E. Farnsworth EVP, CFO | Aug 14, 2026 | Returned to company | −16,275 | – | – | 141,426 |
| William L. Ballhaus Chairman, President & CEO, Director | Aug 14, 2026 | Returned to company | −70,287 | – | – | 304,689 |
| Stuart Kupinsky EVP, CLO & Corp Sec | Aug 14, 2026 | Returned to company | −6,977 | – | – | 61,033 |
| Barry R. Nearhos Director | Jul 16, 2026 | Award | +170 | – | – | 31,494 |
| Howard L. Lance Director | May 26, 2026 | Sale | −1,250 | $98.50 | $123.13K | 0 |
| Howard L. Lance Director | May 26, 2026 | Sale | −8,000 | $99.95 | $799.60K | 1,250 |
| Orlando D. Carvalho Director | May 12, 2026 | Sale | −7,000 | $89.36 | $625.52K | 52,448 |
| Steven Ratner EVP, CHRO | May 11, 2026 | Sale | −2,000 | $92.46 | $184.92K | 32,238 |
| Barry R. Nearhos Director | Apr 16, 2026 | Award | +245 | – | – | 31,324 |
| David E. Farnsworth EVP, CFO | Apr 16, 2026 | Sale | −3,625 | $84.87 | $307.65K | 157,701 |
| Steven Ratner EVP, CHRO | Mar 16, 2026 | Award | +437 | – | – | 34,238 |
| JANA Partners Management, LP Director | Mar 4, 2026 | Sale | −100,899 | $89.68 | $9.05M | 4,114,618 |
| JANA Partners Management, LP Director | Mar 3, 2026 | Sale | −168,648 | $90.12 | $15.20M | 4,215,517 |
| JANA Partners Management, LP Director | Mar 2, 2026 | Sale | −182,510 | $94.05 | $17.17M | 4,384,165 |
| Howard L. Lance Director | Feb 25, 2026 | Sale | −4,832 | $88.98 | $429.95K | 27,272 |
| Douglas Munro SVP, CAO | Feb 17, 2026 | Sale | −582 | $83.56 | $48.63K | 14,328 |
| Stuart Kupinsky EVP, CLO & Corp Sec | Feb 17, 2026 | Sale | −2,287 | $83.56 | $191.10K | 68,010 |
| JANA Partners Management, LP Director | Feb 9, 2026 | Sale | −400,000 | $81.00 | $32.40M | 4,566,675 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Stuart Kupinsky Officer | Sep 21, 2026 | 1,000 | $86.52K | Sep 21, 2026 | Restricted Stock Vesting |
| Steven Ratner Officer | Sep 3, 2026 | 4,000 | $338.03K | Sep 3, 2026 | Restricted Stock Vesting |
| William L. Ballhaus Officer, Director | Aug 26, 2026 | 49,090 | $4.37M | Aug 26, 2026 | Stock Option Exercise |
| William L. Ballhaus Officer, Director | Aug 25, 2026 | 111,076 | $9.68M | Aug 25, 2026 | Stock Option Exercise |
| William L. Ballhaus Officer, Director | Aug 24, 2026 | 100,121 | $8.95M | Aug 24, 2026 | Stock Option Exercise |
| William L. Ballhaus Officer, Director | Aug 24, 2026 | 8,088 | $729.96K | Aug 24, 2026 | Stock Option Exercise |
| William L. Ballhaus Officer, Director | Aug 21, 2026 | 65,000 | $6.01M | Aug 21, 2026 | Stock Option Exercise |
| Stuart Kupinsky Officer | Aug 21, 2026 | 1,000 | $95.23K | Aug 21, 2026 | Restricted Stock Vesting |
| Steven Ratner Officer | Aug 20, 2026 | 1,026 | $100.21K | Aug 20, 2026 | Restricted Stock Vesting |
| Douglas Munro Officer | Aug 20, 2026 | 109 | $10.65K | Aug 20, 2026 | Restricted Stock Vesting |
| David E. Farnsworth Officer | Aug 20, 2026 | 6,612 | $645.82K | Aug 20, 2026 | Restricted Stock Vesting |
| William L. Ballhaus Officer, Director | Aug 20, 2026 | 22,010 | $2.15M | Aug 20, 2026 | Restricted Stock Vesting |
| William L. Ballhaus Officer, Director | Aug 19, 2026 | 26,802 | $2.69M | Aug 19, 2026 | Restricted Stock Vesting |
| Steven Ratner Officer | Aug 19, 2026 | 2,187 | $219.37K | Aug 19, 2026 | Restricted Stock Vesting |
| Stuart Kupinsky Officer | Aug 19, 2026 | 1,308 | $131.20K | Aug 19, 2026 | Restricted Stock Vesting |