Mirion Technologies
365 hedge funds and large institutions have $5.91B invested in Mirion Technologies in 2025 Q4 according to their latest regulatory filings, with 82 funds opening new positions, 147 increasing their positions, 94 reducing their positions, and 54 closing their positions.
1,114% more call options, than puts
Call options by funds: $206M | Put options by funds: $16.9M
56% more repeat investments, than reductions
Existing positions increased: 147 | Existing positions reduced: 94
52% more first-time investments, than exits
New positions opened: 82 | Existing positions closed: 54
7% more funds holding
Funds holding: 341 → 365 (+24)
0% more funds holding in top 10
Funds holding in top 10: 6 → 6 (0)
0% less capital invested
Capital invested by funds: $5.93B → $5.91B (-$23.7M)
10.14% less ownership
Funds ownership: 111.91% → 101.77% (-10%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
TG
TCW Group
Los Angeles,
California
|
+$61.2M |
| 2 |
BlackRock
New York
|
+$44.1M |
| 3 |
Bank of New York Mellon
New York
|
+$42.8M |
| 4 |
JP Morgan Chase
New York
|
+$35.7M |
| 5 |
Citadel Advisors
Miami,
Florida
|
+$35.7M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
T. Rowe Price Investment Management
Baltimore,
Maryland
|
-$161M |
| 2 |
Janus Henderson Group
London,
United Kingdom
|
-$76.4M |
| 3 |
MC
Maverick Capital
Dallas,
Texas
|
-$60.2M |
| 4 |
Dimensional Fund Advisors
Austin,
Texas
|
-$52.5M |
| 5 |
Massachusetts Financial Services
Boston,
Massachusetts
|
-$43.1M |
MIR Hedge Fund Activity: Q4 2025 in Review
365 of the 8,223 institutional investors tracked by Wall St. Rank reported a position in Mirion Technologies (MIR) for Q4 2025, worth a combined $5.91B — down 0.4% from $5.93B a quarter earlier.
Buyers outnumbered sellers: 82 funds opened new MIR positions and 54 closed out — a net gain of 28 holders — while 147 added to existing stakes and 94 trimmed.
The largest buyer was TCW Group, opening a new position worth an estimated $61.2M. The largest seller was T. Rowe Price Investment Management, cutting an estimated $161M.
- 365 institutional investors held Mirion Technologies (MIR) as of Q4 2025, up from 341 in Q3 2025.
- Funds reported $5.91B of Mirion Technologies stock for Q4 2025, down 0.4% quarter-over-quarter.
- 82 funds opened new Mirion Technologies positions in Q4 2025 and 54 closed out, a net change of +28 holders.
- The largest Mirion Technologies buyer in Q4 2025 was TCW Group, an estimated $61.2M added.
- The largest Mirion Technologies seller in Q4 2025 was T. Rowe Price Investment Management, an estimated $161M sold.
Based on aggregated 13F filings for Q4 2025.