MERCURY SYS INC (MRCY)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
374
Reporting holders
$7.6B
Reported value
102.9%
Of shares outstanding
0.6%
Held as options
+44
Holder change
Institutions report 61,875,852 shares against 60,136,133 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. Over 100% because an adviser and a sub-adviser can both report the same shares, and both are counted.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $1.1B | 9,370,902 | 0.02% | 8q | +5.1%+$55.1M |
| JANA Partners Management, LP | $484.3M | 3,958,849 | 25.46% | 12q | -3.6%-$18.2M |
| STATE STREET CORP | $418.0M | 3,418,290 | 0.01% | 31q | -11.6%-$54.7M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $370.8M | 3,031,459 | 0.02% | 2q | +4.1%+$14.7M |
| Invesco Ltd. | $326.6M | 2,669,450 | 0.03% | 31q | +9.3%+$27.9M |
| VANGUARD CAPITAL MANAGEMENT LLC | $296.4M | 2,422,629 | 0.01% | 2q | +0.8%+$2.3M |
| FMR LLC | $225.3M | 1,842,103 | 0.01% | 31q | +103.8%+$114.8M |
| GOLDMAN SACHS GROUP INC | $192.8M | 1,575,727 | 0.02% | 31q | +31.2%+$45.8M |
| Conestoga Capital Advisors, LLC | $181.9M | 1,487,191 | 3.96% | 31q | -22.5%-$52.8M |
| GEODE CAPITAL MANAGEMENT, LLC | $178.6M | 1,459,574 | 0.01% | 31q | -4.3%-$8.1M |
| FIRST TRUST ADVISORS LP | $158.9M | 1,298,957 | 0.09% | 14q | +11.9%+$16.9M |
| DIMENSIONAL FUND ADVISORS LP | $141.4M | 1,156,682 | 0.03% | 31q | -5.8%-$8.7M |
| SEGALL BRYANT & HAMILL, LLC | $125.9M | 1,029,491 | 1.49% | 31q | +10.1%+$11.6M |
| Fisher Asset Management, LLC | $115.5M | 944,069 | 0.03% | 7q | -3.7%-$4.4M |
| FRANKLIN RESOURCES INC | $103.6M | 846,732 | 0.02% | 5q | +86.7%+$48.1M |
| NEUBERGER BERMAN GROUP LLC | $102.1M | 841,556 | 0.07% | 31q | -7.6%-$8.4M |
| MORGAN STANLEY | $99.3M | 811,565 | 0.01% | 35q | +20.9%+$17.2M |
| WELLINGTON MANAGEMENT GROUP LLP | $94.9M | 775,502 | 0.02% | 2q | +2.6%+$2.4M |
| VAN ECK ASSOCIATES CORP | $93.3M | 762,994 | 0.06% | 14q | -10.4%-$10.8M |
| RAYMOND JAMES FINANCIAL INC | $91.6M | 748,808 | 0.02% | 7q | -5.7%-$5.5M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $87.6M | 715,977 | 0.10% | 9q | -16.7%-$17.6M |
| LOOMIS SAYLES & CO L P | $83.3M | 681,142 | 0.10% | 14q | +5.5%+$4.3M |
| AMERICAN CENTURY COMPANIES INC | $81.3M | 664,960 | 0.04% | 31q | +14.1%+$10.0M |
| EMERALD ADVISERS, LLC | $78.1M | 638,682 | 1.84% | 5q | +7.3%+$5.3M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $76.8M | 627,581 | 0.01% | 31q | -1.3%-$1.0M |
| Sixth Street Partners Management Company, L.P. | $76.8M | 627,581 | 0.01% | new | NEW |
| BAMCO INC /NY/ | $74.2M | 606,919 | 0.11% | 31q | -5.9%-$4.7M |
| NORTHERN TRUST CORP | $73.1M | 597,751 | 0.01% | 31q | +9.1%+$6.1M |
| KENNEDY CAPITAL MANAGEMENT LLC | $72.4M | 591,802 | 1.28% | 8q | HELD |
| SNYDER CAPITAL MANAGEMENT L P | $69.3M | 566,155 | 1.20% | 31q | -2.5%-$1.8M |
| AMERIPRISE FINANCIAL INC | $61.1M | 499,207 | 0.01% | 31q | -74.8%-$181.6M |
| Driehaus Capital Management LLC | $59.7M | 487,921 | 0.35% | 5q | +65.6%+$23.6M |
| AMERICAN CAPITAL MANAGEMENT INC | $59.5M | 486,064 | 2.67% | new | NEW |
| Allspring Global Investments Holdings, LLC | $58.4M | 474,866 | 0.09% | 5q | -17.2%-$12.1M |
| EMERALD MUTUAL FUND ADVISERS TRUST | $50.4M | 412,354 | 1.77% | 5q | +9.8%+$4.5M |
| VOYA INVESTMENT MANAGEMENT LLC | $50.2M | 410,076 | 0.04% | 9q | -32.7%-$24.4M |
| ROYAL BANK OF CANADA | $48.2M | 394,081 | 0.01% | 31q | -26.0%-$17.0M |
| OBERWEIS ASSET MANAGEMENT INC/ | $48.0M | 392,723 | 0.99% | 6q | HELD |
| VANGUARD FIDUCIARY TRUST CO | $46.8M | 382,819 | 0.01% | 2q | +9.6%+$4.1M |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | $46.5M | 379,732 | 0.14% | 31q | +16.0%+$6.4M |
| Artisan Partners Limited Partnership | $45.6M | 372,818 | 0.07% | 2q | +5.2%+$2.3M |
| Public Sector Pension Investment Board | $44.4M | 363,074 | 0.06% | 12q | +92.1%+$21.3M |
| JENNISON ASSOCIATES LLC | $43.4M | 354,894 | 0.03% | 4q | -48.4%-$40.8M |
| Bank of New York Mellon Corp | $38.4M | 314,217 | 0.01% | 31q | HELD |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | $34.9M | 285,581 | 0.23% | 5q | -7.9%-$3.0M |
| UBS Group AG | $33.6M | 274,799 | 0.00% | 31q | +17.9%+$5.1M |
| SEI INVESTMENTS CO | $32.0M | 261,712 | 0.03% | 31q | -29.5%-$13.4M |
| PRINCIPAL FINANCIAL GROUP INC | $31.6M | 258,561 | 0.02% | 31q | +0.6%+$178.7K |
| Swedbank AB | $29.9M | 244,299 | 0.03% | 4q | +342.1%+$23.1M |
| Aristotle Capital Boston, LLC | $29.9M | 244,228 | 2.00% | 32q | -8.3%-$2.7M |
| ROYCE & ASSOCIATES LP | $29.2M | 238,327 | 0.23% | 15q | +8.3%+$2.2M |
| KING LUTHER CAPITAL MANAGEMENT CORP | $28.0M | 228,825 | 0.11% | 31q | +8.9%+$2.3M |
| BANK OF AMERICA CORP /DE/ | $27.3M | 223,533 | 0.00% | 31q | -24.2%-$8.7M |
| FIFTH THIRD BANCORP | $27.2M | 222,392 | 0.04% | 31q | -16.7%-$5.5M |
| AXIOM INVESTORS LLC /DE | $25.0M | 204,433 | 0.22% | 6q | -3.1%-$811.7K |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC | $24.6M | 200,867 | 0.24% | 31q | -5.1%-$1.3M |
| WCM INVESTMENT MANAGEMENT, LLC | $24.2M | 219,320 | 0.04% | 30q | HELD |
| VICTORY CAPITAL MANAGEMENT INC | $23.6M | 193,068 | 0.01% | 28q | -14.4%-$4.0M |
| Nuveen, LLC | $22.8M | 186,625 | 0.01% | 6q | -19.5%-$5.5M |
| JPMORGAN CHASE & CO | $21.6M | 193,475 | 0.00% | 31q | -22.0%-$6.1M |
| MetLife Investment Management, LLC | $21.2M | 173,537 | 0.10% | 32q | -41.3%-$14.9M |
| Select Equity Group, L.P. | $20.2M | 165,257 | 0.10% | 6q | +98.0%+$10.0M |
| BNP PARIBAS FINANCIAL MARKETS | $19.4M | 158,224 | 0.01% | 31q | +1.8%+$347.9K |
| DEUTSCHE BANK AG\ | $17.5M | 142,678 | 0.01% | 34q | +11.8%+$1.8M |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | $17.4M | 142,027 | 0.03% | 3q | -50.8%-$17.9M |
| WELLS FARGO & COMPANY/MN | $16.8M | 136,983 | 0.00% | 31q | -44.6%-$13.5M |
| PEREGRINE CAPITAL MANAGEMENT LLC | $16.5M | 135,071 | 0.54% | 22q | -0.8%-$135.1K |
| JANE STREET GROUP, LLC | $16.5M | 115,338 | 0.00% | 27q | HELD |
| NEW YORK STATE COMMON RETIREMENT FUND | $16.3M | 133,229 | 0.02% | 31q | -31.2%-$7.4M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $16.2M | 35,027 | 0.00% | 31q | -21.7%-$4.5M |
| RHUMBLINE ADVISERS | $15.6M | 127,926 | 0.01% | 31q | -11.6%-$2.1M |
| Legal & General Group Plc | $15.4M | 126,258 | 0.00% | 31q | -16.7%-$3.1M |
| Vident Advisory, LLC | $15.1M | 123,337 | 0.11% | 10q | -3.7%-$577.6K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $15.0M | 122,585 | 0.00% | 31q | +5.5%+$784.5K |
| DF DENT & CO INC | $13.9M | 113,611 | 0.26% | new | NEW |
| Man Group plc | $13.5M | 110,597 | 0.02% | 3q | -23.6%-$4.2M |
| Swiss National Bank | $13.3M | 108,400 | 0.01% | 31q | +1.4%+$183.5K |
| AGMAN CAPITAL LLC | $12.5M | 102,403 | 7.90% | 3q | -5.7%-$762.0K |
| Heights Point Management, LP | $12.3M | 100,375 | 9.77% | 3q | -17.7%-$2.6M |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | $12.0M | 98,122 | 0.21% | new | NEW |
| Russell Investments Group, Ltd. | $11.5M | 93,881 | 0.01% | 31q | -14.9%-$2.0M |
| Freshford Capital Management, LLC | $11.5M | 93,761 | 3.92% | 3q | -39.1%-$7.4M |
| CITADEL ADVISORS LLC | $9.9M | options only | 0.00% | 31q | OPTIONS |
| BLAIR WILLIAM & CO/IL | $9.5M | 77,712 | 0.02% | 31q | -1.4%-$132.0K |
| IMC-Chicago, LLC | $9.4M | options only | 0.00% | 2q | OPTIONS |
| Quantinno Capital Management LP | $9.3M | 76,112 | 0.01% | 9q | +15.4%+$1.2M |
| TWO SIGMA INVESTMENTS, LP | $8.8M | 71,861 | 0.01% | 12q | -55.7%-$11.0M |
| STATE OF WISCONSIN INVESTMENT BOARD | $8.2M | 67,350 | 0.02% | 31q | -12.0%-$1.1M |
| NORDEA INVESTMENT MANAGEMENT AB | $7.6M | 65,670 | 0.01% | 3q | +2.0%+$146.4K |
| D. E. Shaw & Co., Inc. | $7.6M | 61,830 | 0.00% | 31q | +12.6%+$847.3K |
| DEEPWATER ASSET MANAGEMENT, LLC | $7.5M | 61,166 | 3.40% | 3q | +8.0%+$555.6K |
| 13D Management LLC | $7.4M | 60,462 | 10.37% | 12q | HELD |
| Cerity Partners LLC | $7.4M | 60,446 | 0.01% | 11q | -0.5%-$38.8K |
| PRUDENTIAL FINANCIAL INC | $6.7M | 55,166 | 0.01% | 12q | +1.8%+$116.2K |
| Pier Capital, LLC | $6.7M | 55,104 | 0.89% | 4q | -1.6%-$110.3K |
| BARCLAYS PLC | $6.7M | 54,495 | 0.00% | 31q | -5.8%-$407.0K |
| Candelo Capital Management LP | $6.6M | 54,060 | 4.08% | 4q | -10.6%-$782.9K |
| AQR CAPITAL MANAGEMENT LLC | $6.3M | 55,158 | 0.00% | 6q | -18.0%-$1.4M |
| Creative Planning | $6.3M | 51,767 | 0.00% | 9q | +35.9%+$1.7M |
| Future Fund LLC | $6.3M | 51,343 | 1.80% | 6q | +5.5%+$330.0K |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-07-31 | 13G | Vanguard Portfolio Management | 5.1% |
| 2026-07-29 | 13G/A | BlackRock, Inc. | 14.4% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 374 | $7.6B | 61,875,852 | 85 | 115 | 117 | 0.6% |
| Q1 2026 | 330 | $4.5B | 61,266,086 | 50 | 120 | 107 | 0.4% |
| Q4 2025 | 323 | $4.4B | 60,073,575 | 39 | 115 | 104 | 0.4% |
| Q3 2025 | 297 | $4.7B | 60,538,640 | 63 | 91 | 98 | 0.4% |
| Q2 2025 | 259 | $3.4B | 63,209,295 | 45 | 98 | 69 | 0.3% |
| Q1 2025 | 231 | $2.7B | 62,059,237 | 37 | 74 | 74 | 0.3% |
| Q4 2024 | 219 | $2.6B | 62,471,113 | 22 | 68 | 73 | 0.4% |
| Q3 2024 | 218 | $2.3B | 61,213,434 | 30 | 65 | 77 | 0.6% |
| Q2 2024 | 209 | $1.7B | 63,740,965 | 30 | 82 | 67 | 0.5% |
| Q1 2024 | 198 | $1.8B | 60,769,549 | 39 | 68 | 60 | 0.5% |
| Q4 2023 | 190 | $2.2B | 58,438,888 | 18 | 72 | 57 | 1.0% |
| Q3 2023 | 192 | $2.1B | 56,906,257 | 28 | 77 | 58 | 0.6% |
| Q2 2023 | 202 | $1.9B | 54,279,344 | 37 | 62 | 71 | 0.5% |
| Q1 2023 | 202 | $2.8B | 54,276,438 | 31 | 71 | 63 | 0.4% |
| Q4 2022 | 175 | $2.3B | 52,180,310 | 27 | 62 | 61 | 0.1% |
| Q3 2022 | 227 | $2.3B | 57,428,208 | 25 | 73 | 87 | 0.1% |
| Q2 2022 | 254 | $3.7B | 56,788,537 | 27 | 93 | 89 | 0.3% |
| Q1 2022 | 252 | $3.8B | 58,454,853 | 37 | 82 | 91 | 0.5% |
| Q4 2021 | 251 | $3.2B | 57,178,660 | 32 | 89 | 90 | 1.0% |
| Q3 2021 | 252 | $2.5B | 52,905,329 | 40 | 95 | 81 | 0.6% |
| Q2 2021 | 256 | $3.5B | 52,573,260 | 37 | 80 | 94 | 0.4% |
| Q1 2021 | 281 | $3.8B | 53,058,850 | 49 | 100 | 90 | 0.3% |
| Q4 2020 | 275 | $4.8B | 54,337,659 | 28 | 86 | 109 | 0.6% |
| Q3 2020 | 274 | $4.2B | 53,975,422 | 33 | 89 | 107 | 0.3% |
| Q2 2020 | 289 | $4.3B | 53,994,355 | 52 | 86 | 118 | 0.3% |
| Q1 2020 | 261 | $4.2B | 58,847,407 | 31 | 85 | 99 | 0.2% |
| Q4 2019 | 271 | $3.8B | 54,249,539 | 36 | 88 | 103 | 0.2% |
| Q3 2019 | 287 | $4.4B | 54,033,130 | 46 | 83 | 103 | 0.2% |
| Q2 2019 | 274 | $3.8B | 53,433,008 | 60 | 124 | 58 | 0.5% |
| Q1 2019 | 248 | $3.1B | 47,554,701 | 53 | 79 | 79 | 0.2% |
| Q4 2018 | 201 | $2.3B | 49,149,065 | 3 | 6 | 5 | 0.1% |