Who owns Mercury Systems (MRCY)
Which tracked institutional funds hold MRCY, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MRCY company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on MRCY is one-sided between 2026-Q1 and 2026-Q2: 174 added or opened and 48 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
MRCY’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes MRCY more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in MRCY divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 364 tracked filers holding MRCY, 206 increased or opened the position and 195 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in MRCY between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 22
- AMERICAN CAPITAL MANAGEMENT INC$59M
- JANE STREET GROUP, LLC$14M
- DF DENT & CO INC$14M
- SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC$12M
- Informed Momentum Co LLC$6M
- HWG Holdings LP$4M
Full exits 32
- T. Rowe Price Investment Management, Inc.$115M
- LORD, ABBETT & CO. LLC$47M
- BESSEMER GROUP INC$33M
- CITADEL ADVISORS LLC$21M
- Thrivent Financial for Lutherans$10M
- Penn Capital Management Company, LLC$9M
Largest adds
- BlackRock, Inc.$678M
- JANA Partners Management, LP$185M
- FMR LLC$160M
- VANGUARD PORTFOLIO MANAGEMENT LLC$159M
- Invesco Ltd.$152M
- STATE STREET CORP$136M
Largest trims
- AMERIPRISE FINANCIAL INC$11M
- JENNISON ASSOCIATES LLC$7M
- Archon Capital Management LLC$6M
- NOMURA ASSET MANAGEMENT INTERNATIONAL INC.$4M
- TWO SIGMA INVESTMENTS, LP$3M
- Edgestream Partners, L.P.$2M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 9,370,902 | $1.1B | 15.5% | 2026-Q2 |
| JANA Partners Management, LP trimmed | 3,958,849 | $484M | 6.6% | 2026-Q2 |
| STATE STREET CORP trimmed | 3,418,290 | $418M | 5.7% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 3,031,459 | $371M | 5.0% | 2026-Q2 |
| Invesco Ltd. added | 2,669,450 | $327M | 4.4% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 2,422,629 | $296M | 4.0% | 2026-Q2 |
| FMR LLC added | 1,842,103 | $225M | 3.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,575,727 | $193M | 2.6% | 2026-Q2 |
| Conestoga Capital Advisors, LLC trimmed | 1,487,191 | $182M | 2.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 1,459,574 | $179M | 2.4% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 1,298,957 | $159M | 2.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 1,285,569 | $157M | 2.1% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,156,682 | $141M | 1.9% | 2026-Q2 |
| SEGALL BRYANT & HAMILL, LLC added | 1,029,491 | $126M | 1.7% | 2026-Q2 |
| Fisher Asset Management, LLC trimmed | 944,069 | $115M | 1.6% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 846,732 | $104M | 1.4% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC trimmed | 841,556 | $102M | 1.4% | 2026-Q2 |
| MORGAN STANLEY added | 811,565 | $99M | 1.3% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 775,502 | $95M | 1.3% | 2026-Q2 |
| VAN ECK ASSOCIATES CORP trimmed | 762,994 | $93M | 1.3% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 748,808 | $92M | 1.2% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 715,977 | $88M | 1.2% | 2026-Q2 |
| LOOMIS SAYLES & CO L P added | 681,142 | $83M | 1.1% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 664,960 | $81M | 1.1% | 2026-Q2 |
| EMERALD ADVISERS, LLC added | 638,682 | $78M | 1.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 627,581 | $77M | 1.0% | 2026-Q2 |
| BAMCO INC /NY/ trimmed | 606,919 | $74M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP added | 597,751 | $73M | 1.0% | 2026-Q2 |
| KENNEDY CAPITAL MANAGEMENT LLC added | 591,802 | $72M | 1.0% | 2026-Q2 |
| SNYDER CAPITAL MANAGEMENT L P trimmed | 566,155 | $69M | 0.9% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 499,207 | $61M | 0.8% | 2026-Q2 |
| Driehaus Capital Management LLC added | 487,921 | $60M | 0.8% | 2026-Q2 |
| AMERICAN CAPITAL MANAGEMENT INC new | 486,064 | $59M | 0.8% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC trimmed | 474,866 | $58M | 0.8% | 2026-Q2 |
| EMERALD MUTUAL FUND ADVISERS TRUST added | 412,354 | $50M | 0.7% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 410,076 | $50M | 0.7% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 394,081 | $48M | 0.7% | 2026-Q2 |
| OBERWEIS ASSET MANAGEMENT INC/ added | 392,723 | $48M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 382,819 | $47M | 0.6% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC added | 379,732 | $46M | 0.6% | 2026-Q2 |
| Artisan Partners Limited Partnership added | 372,818 | $46M | 0.6% | 2026-Q2 |
| JENNISON ASSOCIATES LLC trimmed | 354,894 | $43M | 0.6% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 314,217 | $38M | 0.5% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed | 285,581 | $35M | 0.5% | 2026-Q2 |
| UBS Group AG added | 274,799 | $34M | 0.5% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 261,712 | $32M | 0.4% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 258,561 | $32M | 0.4% | 2026-Q2 |
| Swedbank AB added | 244,299 | $30M | 0.4% | 2026-Q2 |
| Aristotle Capital Boston, LLC trimmed | 244,228 | $30M | 0.4% | 2026-Q2 |
| ROYCE & ASSOCIATES LP added | 238,327 | $29M | 0.4% | 2026-Q2 |
| KING LUTHER CAPITAL MANAGEMENT CORP added | 228,825 | $28M | 0.4% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 223,533 | $27M | 0.4% | 2026-Q2 |
| FIFTH THIRD BANCORP trimmed | 222,392 | $27M | 0.4% | 2026-Q2 |
| WCM INVESTMENT MANAGEMENT, LLC trimmed | 219,320 | $24M | 0.3% | 2026-Q2 |
| AXIOM INVESTORS LLC /DE trimmed | 204,433 | $25M | 0.3% | 2026-Q2 |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC trimmed | 200,867 | $25M | 0.3% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 193,475 | $22M | 0.3% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 193,068 | $24M | 0.3% | 2026-Q2 |
| Nuveen, LLC trimmed | 186,625 | $23M | 0.3% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 181,537 | $22M | 0.3% | 2026-Q2 |
| MetLife Investment Management, LLC trimmed | 173,537 | $21M | 0.3% | 2026-Q2 |
| Select Equity Group, L.P. added | 165,257 | $20M | 0.3% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 158,224 | $19M | 0.3% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 142,678 | $17M | 0.2% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 142,027 | $17M | 0.2% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 136,983 | $17M | 0.2% | 2026-Q2 |
| PEREGRINE CAPITAL MANAGEMENT LLC trimmed | 135,071 | $17M | 0.2% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND trimmed | 133,229 | $16M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 127,926 | $16M | 0.2% | 2026-Q2 |
| Legal & General Group Plc trimmed | 126,258 | $15M | 0.2% | 2026-Q2 |
| Vident Advisory, LLC trimmed | 123,337 | $15M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 122,585 | $15M | 0.2% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 115,338 | $14M | 0.2% | 2026-Q2 |
| DF DENT & CO INC new | 113,611 | $14M | 0.2% | 2026-Q2 |
| Man Group plc trimmed | 110,597 | $14M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 108,400 | $13M | 0.2% | 2026-Q2 |
| AGMAN CAPITAL LLC trimmed | 102,403 | $13M | 0.2% | 2026-Q2 |
| Heights Point Management, LP trimmed | 100,375 | $12M | 0.2% | 2026-Q2 |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC new | 98,122 | $12M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 93,881 | $11M | 0.2% | 2026-Q2 |
| Freshford Capital Management, LLC trimmed | 93,761 | $11M | 0.2% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL trimmed | 77,712 | $10M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 76,112 | $9M | 0.1% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 71,861 | $9M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 67,350 | $8M | 0.1% | 2026-Q2 |
| NORDEA INVESTMENT MANAGEMENT AB added | 65,670 | $8M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 62,374 | $8M | 0.1% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 61,830 | $8M | 0.1% | 2026-Q2 |
| DEEPWATER ASSET MANAGEMENT, LLC added | 61,166 | $7M | 0.1% | 2026-Q2 |
| 13D Management LLC | 60,462 | $7M | 0.1% | 2026-Q2 |
| Cerity Partners LLC trimmed | 60,446 | $7M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 55,166 | $7M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 55,158 | $6M | 0.1% | 2026-Q2 |
| Pier Capital, LLC trimmed | 55,104 | $7M | 0.1% | 2026-Q2 |
| BARCLAYS PLC trimmed | 54,495 | $7M | 0.1% | 2026-Q2 |
| Candelo Capital Management LP trimmed | 54,060 | $7M | 0.1% | 2026-Q2 |
| Creative Planning added | 51,767 | $6M | 0.1% | 2026-Q2 |
| Future Fund LLC added | 51,343 | $6M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 48,152 | $6M | 0.1% | 2026-Q2 |
| Informed Momentum Co LLC trimmed | 47,917 | $6M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.