Mercury SystemsMRCY
13F holders, Q3 2025 (September 30)326holders +41
68new positions
26sold out
8famous investors
$77.42avg. 13F price*
At the end of Q3 2025, 326 institutions reported holding Mercury Systems Inc. (MRCY) in their 13F filings, up 41 from Q2 2025. 68 opened new positions and 26 sold out. The largest holders were BlackRock, Inc. ($656.1M), JANA Partners Management, LP ($461.3M) and Vanguard Group Inc. ($443.6M). 8 famous investors held it, including Ron Baron (0.3% of Baron Capital (BAMCO)'s portfolio), Ken Fisher (0.0% of Fisher Asset Management's portfolio) and Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio).
- Company
- Mercury Systems Inc.
- CUSIP
- 589378108
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 68 | $100.3M |
| Exits | 26 | $44.1M |
All 13F filers, Q2 2025 → Q3 2025: 8,184,059 shares bought and 8,351,412 shares sold, net −167,353 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 326 holders
| BlackRock, Inc. | 0.01% | Add +2.8% | 8,477,158 | $656.1M |
| JANA Partners Management, LP | 22.33% | Reduce -11.8% | 5,959,481 | $461.3M |
| Vanguard Group Inc. | 0.01% | Add +4.0% | 5,731,033 | $443.6M |
| State Street Corp. | 0.01% | Reduce -5.9% | 3,055,358 | $236.5M |
| William Blair Investment Management, LLC | 0.50% | Reduce -47.0% | 2,487,957 | $192.6M |
| Conestoga Capital Advisors, LLC | 2.83% | Reduce -10.9% | 2,279,909 | $176.5M |
| Dimensional Fund Advisors LP | 0.03% | Reduce -4.8% | 1,743,814 | $135.0M |
| First Trust Advisors LP | 0.09% | Add +96.3% | 1,532,822 | $118.6M |
| Invesco Ltd. | 0.02% | Add +161.7% | 1,527,443 | $118.2M |
| T. Rowe Price Investment Management, Inc. | 0.07% | Add +57.1% | 1,521,669 | $117.8M |
| FMR LLC | 0.01% | Add +26.9% | 1,483,473 | $114.8M |
| Geode Capital Management, LLC | 0.01% | Add +4.5% | 1,321,485 | $102.3M |
| Baron Capital (BAMCO) | 0.27% | Add +4.9% | 1,295,284 | $100.3M |
| Goldman Sachs Group Inc. | 0.01% | Add +17.3% | 1,239,435 | $95.9M |
| Neuberger Berman Group LLC | 0.06% | Reduce -0.9% | 1,046,469 | $80.9M |
| Loomis Sayles & Co. L P | 0.08% | Reduce -10.9% | 884,615 | $68.5M |
| Morgan Stanley | 0.00% | Reduce -5.6% | 876,397 | $67.8M |
| Fisher Asset Management | 0.02% | Add +21.3% | 875,279 | $67.7M |
| T. Rowe Price Associates Inc. | 0.01% | Add +1868.9% | 866,077 | $67.0M |
| Snyder Capital Management L P | 1.14% | Reduce -18.4% | 781,404 | $60.5M |
| Lord, Abbett & Co. LLC | 0.19% | Add +39.4% | 770,246 | $59.6M |
| Victory Capital Management Inc. | 0.03% | Reduce -57.4% | 750,321 | $58.1M |
| Allspring Global Investments Holdings, LLC | 0.09% | Add +287.4% | 693,867 | $56.3M |
| Van Eck Associates Corp. | 0.05% | Add +1.7% | 720,856 | $55.8M |
| Segall Bryant & Hamill, LLC | 0.71% | Reduce -31.5% | 684,123 | $53.0M |
| Royal Bank of Canada | 0.01% | Reduce -11.2% | 680,541 | $52.7M |
| Kennedy Capital Management LLC | 1.12% | Add +23.8% | 657,013 | $50.9M |
| Charles Schwab Investment Management Inc. | 0.01% | Reduce -0.7% | 636,598 | $49.3M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.07% | Add +40.6% | 595,593 | $46.1M |
| Northern Trust Corp. | 0.01% | Add +0.5% | 549,751 | $42.6M |
| Jennison Associates LLC | 0.02% | New | 536,407 | $41.5M |
| Emerald Advisers, LLC | 1.32% | Add +16.7% | 533,092 | $41.3M |
| Staley Capital Advisers Inc. | 1.31% | Reduce -12.5% | 411,310 | $31.8M |
| Oberweis Asset Management Inc./ | 1.18% | No change | 398,500 | $30.8M |
| Silvercrest Asset Management Group LLC | 0.20% | Reduce -0.1% | 386,758 | $29.9M |
| Nuveen, LLC | 0.01% | Add +95.9% | 360,009 | $27.9M |
| WCM Investment Management, LLC | 0.05% | Reduce -1.2% | 350,407 | $26.4M |
| Emerald Mutual Fund Advisers Trust | 1.34% | Add +27.7% | 336,058 | $26.0M |
| Sei Investments Co. | 0.03% | Add +63.5% | 311,561 | $24.1M |
| Bank of New York Mellon Corp | 0.00% | Reduce -0.5% | 311,121 | $24.1M |
| Aristotle Capital Boston, LLC | 1.22% | Reduce -2.7% | 307,038 | $23.8M |
| MetLife Investment Management, LLC | 0.11% | Reduce -21.9% | 306,906 | $23.8M |
| Principal Financial Group Inc. | 0.01% | Add +0.2% | 283,280 | $21.9M |
| Ameriprise Financial Inc. | 0.01% | Reduce -32.6% | 280,388 | $21.7M |
| Bessemer Group Inc. | 0.03% | Add +118133.6% | 274,302 | $21.2M |
| Bank of America Corp. | 0.00% | Reduce -16.0% | 252,487 | $19.5M |
| Axiom Investors LLC | 0.14% | Add +74.4% | 247,828 | $19.2M |
| UBS Group AG | 0.00% | Add +42.8% | 240,349 | $18.6M |
| Mutual of America Capital Management LLC | 0.18% | Add +42.8% | 225,374 | $17.4M |
| Comerica Bank | 0.06% | Reduce -8.8% | 221,865 | $17.2M |
| Driehaus Capital Management LLC | 0.12% | Add +1.2% | 221,012 | $17.1M |
| Royce & Associates LP | 0.16% | Reduce -11.5% | 208,459 | $16.1M |
| Public Sector Pension Investment Board | 0.06% | Add +18.7% | 205,644 | $15.9M |
| Raymond James Financial Inc. | 0.00% | Add +15.9% | 192,889 | $14.9M |
| Penn Capital Management Company, LLC | 1.10% | New | 184,154 | $14.3M |
| JPMorgan Chase & Co. | 0.00% | Add +45.5% | 181,773 | $14.1M |
| Legal & General Group Plc | 0.00% | Add +0.8% | 165,476 | $12.8M |
| Connor, Clark & Lunn Investment Management Ltd. | 0.04% | Add +442.6% | 162,786 | $12.6M |
| Rhumbline Advisers | 0.01% | Add +0.6% | 156,605 | $12.1M |
| Citadel Advisors | 0.01% | Reduce -49.3% | 150,574 | $11.7M |
| Macquarie Group Ltd. | 0.01% | Reduce -5.8% | 148,351 | $11.5M |
| Barclays PLC | 0.00% | Reduce -24.1% | 146,871 | $11.4M |
| 13D Management LLC | 10.17% | No change | 137,012 | $10.6M |
| New York State Common Retirement Fund | 0.01% | Add +703.3% | 130,591 | $10.1M |
| Prudential Financial Inc. | 0.01% | Reduce -34.1% | 127,220 | $9.8M |
| Vident Advisory, LLC | 0.09% | Add +15.3% | 118,506 | $9.2M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -47.6% | 114,728 | $8.9M |
| King Luther Capital Management Corp. | 0.03% | Reduce -3.0% | 104,245 | $8.1M |
| Select Equity Group, L.P. | 0.03% | Add +24.0% | 103,848 | $8.0M |
| Castleark Management LLC | 0.22% | Add +9.3% | 101,468 | $7.9M |
| Russell Investments Group, Ltd. | 0.01% | Add +18.9% | 100,481 | $7.8M |
| Swiss National Bank | 0.00% | Add +1.6% | 98,400 | $7.6M |
| Lisanti Capital Growth, LLC | 1.85% | Add +3.6% | 97,625 | $7.6M |
| Blair William & Co. | 0.02% | Reduce -35.6% | 80,520 | $6.2M |
| Two Sigma Investments, LP | 0.01% | Reduce -52.7% | 73,035 | $5.7M |
| State of Wisconsin Investment Board | 0.01% | Add +5.6% | 64,562 | $5.0M |
| Wells Fargo & Company | 0.00% | Add +23.1% | 62,507 | $4.8M |
| New York State Teachers Retirement System | 0.01% | No change | 59,911 | $4.6M |
| Pier Capital, LLC | 0.72% | New | 59,567 | $4.6M |
| Citigroup Inc. | 0.00% | Reduce -34.4% | 59,058 | $4.6M |
| Natixis Advisors, LLC | 0.01% | Add +2.1% | 58,558 | $4.5M |
| B. Metzler seel. Sohn & Co. AG | 0.04% | No change | 57,891 | $4.5M |
| Alliancebernstein L.P. | 0.00% | Reduce -3.9% | 57,425 | $4.4M |
| Informed Momentum Co LLC | 0.51% | New | 58,309 | $4.4M |
| Cerity Partners LLC | 0.01% | Reduce -3.0% | 55,802 | $4.3M |
| D. E. Shaw & Co. | 0.00% | Reduce -25.8% | 54,109 | $4.2M |
| Calamos Advisors LLC | 0.02% | Reduce -1.7% | 54,033 | $4.2M |
| Rice Hall James & Associates, LLC | 0.23% | Reduce -28.1% | 53,340 | $4.1M |
| Quantinno Capital Management LP | 0.01% | Add +37.0% | 52,731 | $4.1M |
| LPL Financial LLC | 0.00% | Reduce -59.8% | 51,515 | $4.0M |
| Zions Bancorporation, National Association | 0.19% | Reduce -13.0% | 50,696 | $3.9M |
| California State Teachers Retirement System | 0.00% | Add +3.6% | 48,527 | $3.8M |
| Deutsche Bank AG | 0.00% | Add +11.9% | 45,098 | $3.5M |
| Portolan Capital Management, LLC | 0.19% | New | 44,864 | $3.5M |
| CANADA LIFE ASSURANCE Co | 0.00% | Add +3.8% | 44,041 | $3.3M |
| Tudor Investment Corporation | 0.02% | Reduce -56.3% | 39,923 | $3.1M |
| Ironwood Investment Management LLC | 1.33% | Reduce -0.6% | 39,448 | $3.1M |
| Thrivent Financial for Lutherans | 0.01% | Add +1.9% | 38,038 | $2.9M |
| Sterling Capital Management LLC | 0.04% | Add +44.4% | 34,661 | $2.7M |
| Great Lakes Advisors, LLC | 0.02% | Reduce -50.2% | 34,617 | $2.7M |
"% of holder's portfolio" is MRCY's weight in each manager's 13F, not the share of Mercury Systems Inc. the manager owns.