13F Insight
DOSSIER · 13F Holders · Q1 2026Mega-capCrowded
MIR

Mirion Technologies, Inc.

378 institutions still hold Mirion Technologies, Inc. as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 60471a101·378 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 6.1%
vs prior quarter
13F value held
$2.7B
53.0% inst. owned
of float
Holders
378
-63 QoQ
filers reporting
Activity
+80 / −40
+959 added · −884 reduced
this quarter
Concentration
26.11%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

378 institutions reported MIR in Q1 2026. BlackRock, Inc. leads at 26.1% of the visible book. -63 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$704M37.9M0.01%Q1 202602
Vanguard Portfolio Management
CIK 0002100121
$333M17.9M0.02%Q1 202603
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$195M10.5M0.00%Q1 202604
STATE STREET CORP
CIK 0000093751
$175M9.4M0.01%Q1 202605
COOPERMAN LEON G
CIK 0000898382
$156M8.4M5.11%Q1 202606
GOLDMAN SACHS GROUP INC
CIK 0000886982
$137M7.3M0.02%Q1 202607
FMR LLC
CIK 0000315066
$122M6.6M0.01%Q1 202608
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$110M5.9M0.01%Q1 202609
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$101M5.4M0.04%Q1 202610
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$87M4.7M0.02%Q1 202611
Bank of New York Mellon Corp
CIK 0001390777
$84M4.5M0.02%Q1 202612
JANUS HENDERSON GROUP PLC
CIK 0001274173
$75M4.0M0.04%Q1 202613
UBS Group AG
CIK 0001610520
$70M3.8M0.01%Q1 202614
Swedbank AB
CIK 0000946431
$59M3.2M0.06%Q1 202615
AMERICAN CENTURY COMPANIES INC
CIK 0000748054
$51M2.7M0.03%Q1 202616
LOOMIS SAYLES & CO L P
CIK 0000312348
$50M2.7M0.07%Q1 202617
MAVERICK CAPITAL LTD
CIK 0000934639
$49M2.6M0.57%Q1 202618
CITADEL ADVISORS LLC
CIK 0001423053
$47M2.0M0.01%Q4 202519
Two Creeks Capital Management, LP
CIK 0001606430
$46M2.4M4.68%Q1 202620
JPMORGAN CHASE & CO
CIK 0000019617
$45M2.6M0.00%Q1 2026
Page 1 of 19
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