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Mirion Technologies
MIR

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.

New
Increased
Maintained
Reduced
Closed

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)

Holders
301
Holders Change
+70
Holders Change %
+30.3%
% of All Funds
3.96%
Holding in Top 10
6
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-14.29%
% of All Funds
0.08%
New
101
Increased
115
Reduced
63
Closed
30
Calls
$72.9M
Puts
$50.8M
Net Calls
+$22.1M
Net Calls Change
+$5.79M

Top Buyers

Rank Fund Capital Flow
1
Massachusetts Financial Services
Massachusetts Financial Services
Massachusetts
+$66.1M
2
Invesco
Invesco
Georgia
+$39.6M
3
DCM
Driehaus Capital Management
Illinois
+$34.6M
4
Royal Bank of Canada
Royal Bank of Canada
Ontario, Canada
+$27.9M
5
Loomis, Sayles & Company
Loomis, Sayles & Company
Massachusetts
+$27.4M

Top Sellers

Rank Fund Capital Flow
1
MC
Maverick Capital
Texas
-$47.4M
2
Swedbank
Swedbank
Sweden
-$21.7M
3
MCM
Masters Capital Management
Georgia
-$17.2M
4
William Blair Investment Management
William Blair Investment Management
Illinois
-$12.5M
5
ACM
Arosa Capital Management
Florida
-$11.9M
Name Holding Trade Value Shares
Change 		Change in
Stake
PWM
301
Parkworth Wealth Management
California
$129 – – –
HNB
302
Huntington National Bank
Ohio
$22 +$17 +1 New
MCM
303
Masters Capital Management
Georgia
– -$17.2M -1,000,000 Closed
Norges Bank
304
Norges Bank
Norway
– -$8.74M -602,500 Closed
TI
305
Trexquant Investment
Connecticut
– -$8.23M -567,609 Closed
Tudor Investment Corp
306
Tudor Investment Corp
Connecticut
– -$7.43M -430,949 Closed
BAM
307
Bastion Asset Management
Canada
– -$4.89M -326,580 Closed
AIMCA
308
Alberta Investment Management Corp (AIMCo)
Alberta, Canada
– -$2.62M -180,520 Closed
DFCM
309
Dark Forest Capital Management
Puerto Rico
– -$2.2M -151,996 Closed
HF
310
HRT Financial
New York
– -$2.1M -145,133 Closed
Squarepoint
311
Squarepoint
New York
– -$1.56M -107,363 Closed
CF
312
Corebridge Financial
Texas
– -$1.47M -101,203 Closed
ACM
313
Aquatic Capital Management
Illinois
– -$1.42M -97,996 Closed
First Manhattan
314
First Manhattan
New York
– -$1.12M -76,932 Closed
XT
315
XTX Topco
Cayman Islands
– -$1M -69,269 Closed
VRS
316
Virginia Retirement Systems
Virginia
– -$689K -47,546 Closed
EGM
317
Engineers Gate Manager
New York
– -$497K -34,303 Closed
CCIA
318
Campbell & Co Investment Adviser
Maryland
– -$485K -33,425 Closed
PP
319
PDT Partners
New York
– -$333K -22,969 Closed
DC
320
Diametric Capital
Massachusetts
– -$198K -13,679 Closed
TSS
321
Two Sigma Securities
New York
– -$166K -11,427 Closed
SM
322
Sciencast Management
New Jersey
– -$152K -10,508 Closed
BAMF
323
BI Asset Management Fondsmaeglerselskab
Denmark
– -$68K -4,676 Closed
QCG
324
Quadrant Capital Group
Ohio
– -$11.8K -817 Closed
Optiver Holding
325
Optiver Holding
Netherlands
– -$10.7K -736 Closed
10 11 12
13
14

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.