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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
ASRS
151
Arizona State Retirement System
Arizona
$1.34M +$72.7K +4,219 +7%
SO
152
STRS Ohio
Ohio
$1.34M +$738K +42,800 +222%
Handelsbanken Fonder
153
Handelsbanken Fonder
Sweden
$1.31M – – –
CI
154
Corient IA
Florida
$1.29M +$862K +50,000 +500%
FC
155
FORA Capital
Florida
$1.27M +$1.02M +58,903 New
VOYA Investment Management
156
VOYA Investment Management
Georgia
$1.24M +$28.2K +1,634 +3%
Mariner
157
Mariner
Kansas
$1.24M +$22K +1,276 +2%
HCM
158
Highbridge Capital Management
New York
$1.23M +$989K +57,352 New
SP
159
Steelhead Partners
Washington
$1.23M +$989K +57,352 New
Polen Capital Management
160
Polen Capital Management
Florida
$1.23M +$987K +57,230 New
State Board of Administration of Florida Retirement System
161
State Board of Administration of Florida Retirement System
Florida
$1.23M – – –
BCP
162
Blackhawk Capital Partners
Wisconsin
$1.14M +$912K +52,893 New
CI Investments Inc
163
CI Investments Inc
Ontario, Canada
$1.14M +$911K +52,865 New
PFSRSONJ
164
Police & Firemen's Retirement System of New Jersey
New Jersey
$1.03M +$66.2K +3,843 +9%
LPL Financial
165
LPL Financial
California
$973K -$62.9K -3,648 -7%
KK
166
KLP Kapitalforvaltning
Norway
$956K +$119K +6,900 +18%
Calamos Advisors
167
Calamos Advisors
Illinois
$956K +$765K +44,400 New
GAM
168
Groupama Asset Management
France
$932K – – –
ProShare Advisors
169
ProShare Advisors
Maryland
$928K -$28.1K -1,630 -4%
HI
170
HBK Investments
Texas
$926K +$741K +42,998 New
TCM
171
Tenor Capital Management
New York
$926K +$741K +42,998 New
CAM
172
Cresset Asset Management
Illinois
$915K -$276K -16,000 -27%
TRCT
173
Tower Research Capital (TRC)
New York
$859K +$591K +34,292 +614%
Twin Tree Management
174
Twin Tree Management
Texas
$852K +$682K +39,581 New
Zurich Cantonal Bank
175
Zurich Cantonal Bank
Switzerland
$826K – – –
5 6
7
8 9

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.