Mercury Systems
MRCY
346 hedge funds and large institutions have $4.72B invested in Mercury Systems in 2025 Q4 according to their latest regulatory filings, with 55 funds opening new positions, 126 increasing their positions, 113 reducing their positions, and 32 closing their positions.
72% more first-time investments, than exits
New positions opened: 55 | Existing positions closed: 32
41% more call options, than puts
Call options by funds: $10.2M | Put options by funds: $7.21M
12% more repeat investments, than reductions
Existing positions increased: 126 | Existing positions reduced: 113
6% more funds holding
Funds holding: 326 → 346 (+20)
0% more funds holding in top 10
Funds holding in top 10: 6 → 6 (0)
0.61% less ownership
Funds ownership: 108.06% → 107.45% (-0.61%)
6% less capital invested
Capital invested by funds: $5.02B → $4.72B (-$303M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Ameriprise
Minneapolis,
Minnesota
|
+$75.1M |
| 2 |
Raymond James Financial
St Petersburg,
Florida
|
+$38.3M |
| 3 |
VOYA Investment Management
Atlanta,
Georgia
|
+$35.6M |
| 4 |
Invesco
Atlanta,
Georgia
|
+$28.5M |
| 5 |
State Street
Boston,
Massachusetts
|
+$27.4M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
William Blair Investment Management
Chicago,
Illinois
|
-$112M |
| 2 |
JPM
JANA Partners Management
New York
|
-$74.4M |
| 3 |
Victory Capital Management
San Antonio,
Texas
|
-$38.9M |
| 4 |
BAMCO Inc
New York
|
-$34.2M |
| 5 |
Fidelity Investments
Boston,
Massachusetts
|
-$24.6M |
MRCY Hedge Fund Activity: Q4 2025 in Review
346 of the 8,267 institutional investors tracked by Wall St. Rank reported a position in Mercury Systems (MRCY) for Q4 2025, worth a combined $4.72B — down 6% from $5.02B a quarter earlier.
Buyers outnumbered sellers: 55 funds opened new MRCY positions and 32 closed out — a net gain of 23 holders — while 126 added to existing stakes and 113 trimmed.
The largest buyer was Ameriprise, adding an estimated $75.1M. The largest seller was William Blair Investment Management, cutting an estimated $112M.
- 346 institutional investors held Mercury Systems (MRCY) as of Q4 2025, up from 326 in Q3 2025.
- Funds reported $4.72B of Mercury Systems stock for Q4 2025, down 6% quarter-over-quarter.
- 55 funds opened new Mercury Systems positions in Q4 2025 and 32 closed out, a net change of +23 holders.
- The largest Mercury Systems buyer in Q4 2025 was Ameriprise, an estimated $75.1M added.
- The largest Mercury Systems seller in Q4 2025 was William Blair Investment Management, an estimated $112M sold.
Based on aggregated 13F filings for Q4 2025.