Mirion Technologies
301 hedge funds and large institutions have $4.46B invested in Mirion Technologies in 2025 Q2 according to their latest regulatory filings, with 101 funds opening new positions, 115 increasing their positions, 63 reducing their positions, and 30 closing their positions.
237% more first-time investments, than exits
New positions opened: 101 | Existing positions closed: 30
83% more repeat investments, than reductions
Existing positions increased: 115 | Existing positions reduced: 63
61% more capital invested
Capital invested by funds: $2.77B → $4.46B (+$1.7B)
44% more call options, than puts
Call options by funds: $72.9M | Put options by funds: $50.8M
30% more funds holding
Funds holding: 231 → 301 (+70)
7.54% more ownership
Funds ownership: 84.39% → 91.93% (+7.5%)
14% less funds holding in top 10
Funds holding in top 10: 7 → 6 (-1)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Massachusetts Financial Services
Boston,
Massachusetts
|
+$66.1M |
| 2 |
Invesco
Atlanta,
Georgia
|
+$39.6M |
| 3 |
DCM
Driehaus Capital Management
Chicago,
Illinois
|
+$34.6M |
| 4 |
Royal Bank of Canada
Toronto,
Ontario, Canada
|
+$27.9M |
| 5 |
Loomis, Sayles & Company
Boston,
Massachusetts
|
+$27.4M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
MC
Maverick Capital
Dallas,
Texas
|
-$47.4M |
| 2 |
Swedbank
Stockholm,
Sweden
|
-$21.7M |
| 3 |
MCM
Masters Capital Management
Atlanta,
Georgia
|
-$17.2M |
| 4 |
William Blair Investment Management
Chicago,
Illinois
|
-$12.5M |
| 5 |
ACM
Arosa Capital Management
Miami Beach,
Florida
|
-$11.9M |
| Name | Holding | Trade Value |
Shares Change |
Change in Stake |
|
|---|---|---|---|---|---|
|
GFPC
326
Global Financial Private Client
Sarasota,
Florida
| – | -$7.16K | -494 | Closed |
|
|
SO
327
Sierra Ocean
Ripon,
California
| – | -$4.66K | -321 | Closed |
|
|
MEG
328
Millstone Evans Group
Boulder,
Colorado
| – | -$3.89K | -268 | Closed |
|
|
CCM
329
Coldstream Capital Management
Bellevue,
Washington
| – | -$3.09K | -213 | Closed |
|
330
Amundi
Paris,
France
| – | -$1.81K | -133 | Closed |
|
|
SC
331
Stephens Consulting
Flint,
Michigan
| – | -$1.09K | -75 | Closed |
|
|
CIAM
332
Caitong International Asset Management
Hong Kong
| – | -$624 | -43 | Closed |
|
MIR Hedge Fund Activity: Q2 2025 in Review
301 of the 7,595 institutional investors tracked by Wall St. Rank reported a position in Mirion Technologies (MIR) for Q2 2025, worth a combined $4.46B — up 61% from $2.77B a quarter earlier.
Buyers outnumbered sellers: 101 funds opened new MIR positions and 30 closed out — a net gain of 71 holders — while 115 added to existing stakes and 63 trimmed.
The largest buyer was Massachusetts Financial Services, opening a new position worth an estimated $66.1M. The largest seller was Maverick Capital, cutting an estimated $47.4M.
- 301 institutional investors held Mirion Technologies (MIR) as of Q2 2025, up from 231 in Q1 2025.
- Funds reported $4.46B of Mirion Technologies stock for Q2 2025, up 61% quarter-over-quarter.
- 101 funds opened new Mirion Technologies positions in Q2 2025 and 30 closed out, a net change of +71 holders.
- The largest Mirion Technologies buyer in Q2 2025 was Massachusetts Financial Services, an estimated $66.1M added.
- The largest Mirion Technologies seller in Q2 2025 was Maverick Capital, an estimated $47.4M sold.
Based on aggregated 13F filings for Q2 2025.