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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
AIM
376
Aigen Investment Management
New York
– -$400K -18,596 Closed
GAM
377
Gotham Asset Management
New York
– -$293K -13,603 Closed
Baird Financial Group
378
Baird Financial Group
Wisconsin
– -$270K -12,559 Closed
LAM
379
Longboard Asset Management
Arizona
– -$250K -11,594 Closed
Stifel Financial
380
Stifel Financial
Missouri
– -$225K -10,466 Closed
C
381
Covestor
United Kingdom
– -$223K -10,311 -100%
SSG
382
Summit Securities Group
New York
– -$63.9K -2,970 Closed
BIG
383
Brooklyn Investment Group
New York
– -$35.6K -1,655 Closed
UOTTAIMCU
384
University of Texas/Texas AM Investment Management Co (UTIMCO)
Texas
– -$20.5K -952 Closed
AGWCA
385
Annis Gardner Whiting Capital Advisors
Florida
– -$11.8K -546 Closed
GWM
386
Geneos Wealth Management
Colorado
– -$3.21K -149 Closed
WSFS
387
Wilmington Savings Fund Society
Delaware
– -$3.08K -143 Closed
MYIA
388
Mount Yale Investment Advisors
Colorado
– -$2.15K -100 Closed
PWA
389
Physician Wealth Advisors
Utah
– -$625 -29 Closed
CCM
390
Cloud Capital Management
Washington
– +$843 +39 New
12 13 14 15
16

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.