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Mirion Technologies
MIR

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.

New
Increased
Maintained
Reduced
Closed

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%)

Holders
365
Holders Change
+24
Holders Change %
+7.04%
% of All Funds
4.44%
Holding in Top 10
6
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.07%
New
82
Increased
147
Reduced
94
Closed
54
Calls
$206M
Puts
$16.9M
Net Calls
+$189M
Net Calls Change
+$131M

Top Buyers

1
TG
TCW Group
California
+$61.2M
2
BlackRock
BlackRock
New York
+$44.1M
3
Bank of New York Mellon
Bank of New York Mellon
New York
+$42.8M
4
JP Morgan Chase
JP Morgan Chase
New York
+$35.7M
5
Citadel Advisors
Citadel Advisors
Florida
+$35.7M

Top Sellers

1
T. Rowe Price Investment Management
T. Rowe Price Investment Management
Maryland
-$161M
2
Janus Henderson Group
Janus Henderson Group
United Kingdom
-$76.4M
3
MC
Maverick Capital
Texas
-$60.2M
4
Dimensional Fund Advisors
Dimensional Fund Advisors
Texas
-$52.5M
5
Massachusetts Financial Services
Massachusetts Financial Services
Massachusetts
-$43.1M
Name Holding Trade Value Shares
Change 		Change in
Stake
Neuberger Berman Group
76
Neuberger Berman Group
New York
$13.3M +$14.2M +567,671 New
APC
77
Alta Park Capital
California
$13.2M -$1.21M -48,639 -8%
GI
78
GAMCO Investors
Connecticut
$12.7M +$382K +15,310 +3%
SPPAM
79
Summit Partners Public Asset Management
Massachusetts
$11.7M – – –
TAM
80
Telemark Asset Management
Massachusetts
$11.7M – – –
BA
81
Bridgewater Associates
Connecticut
$11.5M +$12.2M +489,928 New
Swiss National Bank
82
Swiss National Bank
Switzerland
$10.9M +$1.21M +48,700 +12%
SEI Investments
83
SEI Investments
Pennsylvania
$10.7M +$2.71M +108,813 +31%
UBS AM
84
UBS AM
Illinois
$10.4M +$1.33M +53,272 +14%
GF
85
Gabelli Funds
New York
$10.1M -$1.27M -51,000 -11%
Victory Capital Management
86
Victory Capital Management
Texas
$9.51M -$16.9M -676,735 -63%
PCM
87
Peregrine Capital Management
Minnesota
$9.44M -$996K -39,942 -9%
TI
88
Tidal Investments
Wisconsin
$9.44M +$9.53M +382,259 +1,840%
ZIM
89
Zacks Investment Management
Illinois
$9.42M -$122K -4,891 -1%
SMDAM
90
Sumitomo Mitsui DS Asset Management
Japan
$9.36M -$455K -18,247 -4%
Bank of Nova Scotia
91
Bank of Nova Scotia
Ontario, Canada
$9.16M +$9.75M +391,006 New
Citigroup
92
Citigroup
New York
$8.85M -$2.56M -102,458 -21%
Barclays
93
Barclays
United Kingdom
$8.76M -$680K -27,280 -7%
BGM
94
Burkehill Global Management
New York
$8.2M – – –
CM
95
Castleark Management
Illinois
$8.15M +$8.68M +348,130 New
First Trust Advisors
96
First Trust Advisors
Illinois
$8.15M +$1.97M +78,903 +29%
TD Asset Management
97
TD Asset Management
Ontario, Canada
$8.15M -$3.46M -138,870 -29%
Universal-Beteiligungs- und Servicegesellschaft
98
Universal-Beteiligungs- und Servicegesellschaft
Germany
$7.63M +$1.24M +49,822 +18%
AAP
99
Ardsley Advisory Partners
Connecticut
$7.61M -$80.3K -3,220 -1%
AllianceBernstein
100
AllianceBernstein
Tennessee
$7.51M -$1.19M -47,916 -13%
2 3
4
5 6

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.