Mirion Technologies, Inc. (MIR) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

290,000,000Shares Outstanding

12,659,386Shares held by institutions

$278,379,898Value of institutional holdings

80.59%Institutional ownership %

-2.74%Shares Changed QoQ

345No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

According to SEC filings for the period ending December 2025, Mirion Technologies, Inc. (NYSE:MIR) is held by 345 institutional firms.

The percentage of Mirion Technologies owned by institutions changed from 94.2% in September 2025 to 80.6% in December 2025, marking a slight down trend.
On a quarter-over-quarter basis, institutional holdings shifted by -2.74%, with a year-over-year an increase of 54.71% in the count of filers.
Among the 345 institutional holders of Mirion Technologies, 216 added to their stakes while 91 trimmed their positions and 38 held steady.
The aggregate institutional position in Mirion Technologies now stands at 233.70Mn shares as of December 2025, after investors decreased their holdings (down by 6.59Mn shares quarter on quarter which is up 28.75Mn shares year over year).
BlackRock, Inc.'s holding of 38.20Mn shares as of December 31, 2025 makes it the primary institutional investor in Mirion Technologies, owning 13.17% of the stock.
Among the most significant buyers of Mirion Technologies during December 2025 were TCW GROUP INC (2.45Mn), BlackRock, Inc. (1.77Mn), Bank of New York Mellon Corp (1.72Mn), JPMORGAN CHASE & CO (1.43Mn), CITADEL ADVISORS LLC (1.43Mn).
Leading sellers of Mirion Technologies stock in December 2025 included T. Rowe Price Investment Management, Inc. (19.24Mn), JANUS HENDERSON GROUP PLC (3.06Mn), DIMENSIONAL FUND ADVISORS LP (2.10Mn), MASSACHUSETTS FINANCIAL SERVICES CO /MA/ (1.73Mn), Alyeska Investment Group, L.P. (1.60Mn).
The top 10 institutional holders of Mirion Technologies for the quarter ending December 2025 included BlackRock, Inc. (38.20Mn), VANGUARD GROUP INC (30.35Mn), STATE STREET CORP (9.20Mn), FMR LLC (8.41Mn), COOPERMAN LEON G (8.38Mn), GEODE CAPITAL MANAGEMENT, LLC (5.79Mn), GOLDMAN SACHS GROUP INC (5.25Mn), UBS Group AG (4.85Mn), JANUS HENDERSON GROUP PLC (4.60Mn), DIMENSIONAL FUND ADVISORS LP (4.10Mn).

345 Institutional Holders

12,659,386 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	38,199,968	1,769,477	4.86%	$894,643,252.00
VANGUARD GROUP INC	31 Dec, 2025	30,346,328	-71,999	-0.24%	$710,711,002.00
STATE STREET CORP	31 Dec, 2025	9,198,795	382,449	4.34%	$215,435,779.00
FMR LLC	31 Dec, 2025	8,414,300	-664,001	-7.31%	$197,062,906.00
COOPERMAN LEON G	31 Dec, 2025	8,383,441	0	0.00%	$196,340,188.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	5,786,596	157,687	2.80%	$135,545,437.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	5,248,506	193,914	3.84%	$122,920,011.00
UBS Group AG	31 Dec, 2025	4,852,587	55,754	1.16%	$113,647,588.00
JANUS HENDERSON GROUP PLC	31 Dec, 2025	4,596,949	-3,064,988	-40.00%	$107,660,006.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	4,102,558	-2,104,375	-33.90%	$96,087,235.00
MASSACHUSETTS FINANCIAL SERVICES CO /MA/	31 Dec, 2025	3,663,479	-1,728,293	-32.05%	$85,798,680.00
Swedbank AB	31 Dec, 2025	3,398,200	-607,000	-15.16%	$79,585,844.00
Bank of New York Mellon Corp	31 Dec, 2025	3,076,945	1,716,020	126.09%	$72,062,067.00
Two Creeks Capital Management, LP	31 Dec, 2025	2,923,802	-674,961	-18.76%	$68,475,443.00
LOOMIS SAYLES & CO L P	31 Dec, 2025	2,845,619	84,084	3.04%	$66,644,397.00
Hood River Capital Management LLC	31 Dec, 2025	2,780,137	16,853	0.61%	$65,110,809.00
AMERICAN CENTURY COMPANIES INC	31 Dec, 2025	2,556,724	-672,814	-20.83%	$59,878,517.00
TCW GROUP INC	31 Dec, 2025	2,452,579	2,452,579	0.00%	$57,439,400.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	2,344,241	109,614	4.91%	$54,902,124.00
AMERIPRISE FINANCIAL INC	31 Dec, 2025	2,336,310	619,118	36.05%	$54,716,381.00

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