Mercury Systems
MRCY
393 hedge funds and large institutions have $8.02B invested in Mercury Systems in 2026 Q2 according to their latest regulatory filings, with 85 funds opening new positions, 129 increasing their positions, 132 reducing their positions, and 44 closing their positions.
93% more first-time investments, than exits
New positions opened: 85 | Existing positions closed: 44
69% more capital invested
Capital invested by funds: $4.75B → $8.02B (+$3.27B)
50% more funds holding in top 10
Funds holding in top 10: 8 → 12 (+4)
29% more call options, than puts
Call options by funds: $24.8M | Put options by funds: $19.3M
10% more funds holding
Funds holding: 357 → 393 (+36)
0.69% more ownership
Funds ownership: 108.6% → 109.3% (+0.69%)
2% less repeat investments, than reductions
Existing positions increased: 129 | Existing positions reduced: 132
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$89.4M |
| 2 |
ACM
American Capital Management
New York
|
+$46.3M |
| 3 |
BlackRock
New York
|
+$42.9M |
| 4 |
Franklin Resources
San Mateo,
California
|
+$37.5M |
| 5 |
Goldman Sachs
New York
|
+$35.7M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Ameriprise
Minneapolis,
Minnesota
|
-$46.9M |
| 2 |
State Street
Boston,
Massachusetts
|
-$42.6M |
| 3 |
CCA
Conestoga Capital Advisors
Wayne,
Pennsylvania
|
-$41.1M |
| 4 |
Jennison Associates
New York
|
-$31.7M |
| 5 |
Citadel Advisors
Miami,
Florida
|
-$27.9M |
MRCY Hedge Fund Activity: Q2 2026 in Review
393 of the 8,349 institutional investors tracked by Wall St. Rank reported a position in Mercury Systems (MRCY) for Q2 2026, worth a combined $8.02B — up 69% from $4.75B a quarter earlier.
Buyers outnumbered sellers: 85 funds opened new MRCY positions and 44 closed out — a net gain of 41 holders — while 129 added to existing stakes and 132 trimmed.
The largest buyer was Fidelity Investments, adding an estimated $89.4M. The largest seller was Ameriprise, cutting an estimated $46.9M.
- 393 institutional investors held Mercury Systems (MRCY) as of Q2 2026, up from 357 in Q1 2026.
- Funds reported $8.02B of Mercury Systems stock for Q2 2026, up 69% quarter-over-quarter.
- 85 funds opened new Mercury Systems positions in Q2 2026 and 44 closed out, a net change of +41 holders.
- The largest Mercury Systems buyer in Q2 2026 was Fidelity Investments, an estimated $89.4M added.
- The largest Mercury Systems seller in Q2 2026 was Ameriprise, an estimated $46.9M sold.
Based on aggregated 13F filings for Q2 2026.