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Mirion Technologies
MIR

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.

New
Increased
Maintained
Reduced
Closed

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)

Holders
342
Holders Change
+41
Holders Change %
+13.62%
% of All Funds
4.49%
Holding in Top 10
6
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.08%
New
91
Increased
129
Reduced
91
Closed
47
Calls
$86M
Puts
$28.3M
Net Calls
+$57.7M
Net Calls Change
+$35.6M

Top Buyers

Rank Fund Capital Flow
1
BlackRock
BlackRock
New York
+$420M
2
Fidelity Investments
Fidelity Investments
Massachusetts
+$176M
3
Vanguard Group
Vanguard Group
Pennsylvania
+$144M
4
Goldman Sachs
Goldman Sachs
New York
+$95.5M
5
State Street
State Street
Massachusetts
+$80.5M

Top Sellers

Rank Fund Capital Flow
1
MC
Maverick Capital
Texas
-$58.8M
2
Brown Advisory
Brown Advisory
Maryland
-$57.9M
3
Millennium Management
Millennium Management
New York
-$51M
4
AIM
Artemis Investment Management
United Kingdom
-$44.9M
5
CCM
Corsair Capital Management
New York
-$42.8M
Name Holding Trade Value Shares
Change 		Change in
Stake
FGP
151
Freestone Grove Partners
California
$1.8M +$1.67M +77,415 New
SCM
152
Sandler Capital Management
New York
$1.78M -$277K -12,830 -14%
LPL Financial
153
LPL Financial
California
$1.77M +$671K +31,058 +69%
Polen Capital Management
154
Polen Capital Management
Florida
$1.77M +$408K +18,889 +33%
Capstone Investment Advisors
155
Capstone Investment Advisors
New York
$1.76M -$619K -28,650 -27%
Twin Tree Management
156
Twin Tree Management
Texas
$1.75M +$768K +35,537 +90%
DKCM
157
Davidson Kempner Capital Management
New York
$1.74M +$1.62M +75,000 New
YCM
158
Yousif Capital Management
Michigan
$1.74M +$1.62M +74,991 New
Handelsbanken Fonder
159
Handelsbanken Fonder
Sweden
$1.69M +$249K +11,500 +19%
AB
160
Amalgamated Bank
New York
$1.62M +$1.35M +62,667 +887%
LCG
161
Lisanti Capital Growth
New York
$1.56M +$1.45M +67,175 New
RFA
162
Register Financial Advisors
Georgia
$1.53M +$43.2K +2,000 +3%
ASRS
163
Arizona State Retirement System
Arizona
$1.47M +$21.1K +974 +2%
COPPSERS
164
Commonwealth of Pennsylvania Public School Employees Retirement System
Pennsylvania
$1.45M +$1.35M +62,446 New
PFSRSONJ
165
Police & Firemen's Retirement System of New Jersey
New Jersey
$1.39M +$253K +11,681 +24%
State of Tennessee, Department of Treasury
166
State of Tennessee, Department of Treasury
Tennessee
$1.34M +$1.24M +57,420 New
State Board of Administration of Florida Retirement System
167
State Board of Administration of Florida Retirement System
Florida
$1.33M – – –
Jane Street
168
Jane Street
New York
$1.3M -$4.02M -185,784 -77%
OPERF
169
Oregon Public Employees Retirement Fund
Oregon
$1.28M +$1.19M +55,200 New
New York State Teachers Retirement System (NYSTRS)
170
New York State Teachers Retirement System (NYSTRS)
New York
$1.27M +$1.18M +54,536 New
TRSOTSOK
171
Teachers Retirement System of the State of Kentucky
Kentucky
$1.22M +$1.13M +52,500 New
BHCM
172
Brevan Howard Capital Management
Jersey
$1.16M +$367K +16,985 +52%
HVCM
173
Hel Ved Capital Management
Hong Kong
$1.16M +$1.08M +49,800 New
WAM
174
Wolverine Asset Management
Illinois
$1.15M -$867K -40,093 -45%
Wolverine Trading
175
Wolverine Trading
Illinois
$1.14M +$772K +35,717 +238%
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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.