Mirion Technologies
342 hedge funds and large institutions have $5.93B invested in Mirion Technologies in 2025 Q3 according to their latest regulatory filings, with 91 funds opening new positions, 129 increasing their positions, 91 reducing their positions, and 47 closing their positions.
204% more call options, than puts
Call options by funds: $86M | Put options by funds: $28.3M
94% more first-time investments, than exits
New positions opened: 91 | Existing positions closed: 47
42% more repeat investments, than reductions
Existing positions increased: 129 | Existing positions reduced: 91
33% more capital invested
Capital invested by funds: $4.46B → $5.93B (+$1.47B)
19.98% more ownership
Funds ownership: 91.93% → 111.91% (+20%)
14% more funds holding
Funds holding: 301 → 342 (+41)
0% more funds holding in top 10
Funds holding in top 10: 6 → 6 (0)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
+$420M |
| 2 |
Fidelity Investments
Boston,
Massachusetts
|
+$176M |
| 3 |
Vanguard Group
Malvern,
Pennsylvania
|
+$144M |
| 4 |
Goldman Sachs
New York
|
+$95.5M |
| 5 |
State Street
Boston,
Massachusetts
|
+$80.5M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
MC
Maverick Capital
Dallas,
Texas
|
-$58.8M |
| 2 |
Brown Advisory
Baltimore,
Maryland
|
-$57.9M |
| 3 |
Millennium Management
New York
|
-$51M |
| 4 |
AIM
Artemis Investment Management
Edinburgh,
United Kingdom
|
-$44.9M |
| 5 |
CCM
Corsair Capital Management
New York
|
-$42.8M |
MIR Hedge Fund Activity: Q3 2025 in Review
342 of the 7,621 institutional investors tracked by Wall St. Rank reported a position in Mirion Technologies (MIR) for Q3 2025, worth a combined $5.93B — up 33% from $4.46B a quarter earlier.
Buyers outnumbered sellers: 91 funds opened new MIR positions and 47 closed out — a net gain of 44 holders — while 129 added to existing stakes and 91 trimmed.
The largest buyer was BlackRock, adding an estimated $420M. The largest seller was Maverick Capital, cutting an estimated $58.8M.
- 342 institutional investors held Mirion Technologies (MIR) as of Q3 2025, up from 301 in Q2 2025.
- Funds reported $5.93B of Mirion Technologies stock for Q3 2025, up 33% quarter-over-quarter.
- 91 funds opened new Mirion Technologies positions in Q3 2025 and 47 closed out, a net change of +44 holders.
- The largest Mirion Technologies buyer in Q3 2025 was BlackRock, an estimated $420M added.
- The largest Mirion Technologies seller in Q3 2025 was Maverick Capital, an estimated $58.8M sold.
Based on aggregated 13F filings for Q3 2025.