Mirion Technologies, Inc. (MIR) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

255,662,000Shares Outstanding

262,186,532Shares held by institutions

$5,154,587,219Value of institutional holdings

102.55%Institutional ownership %

6.15%Shares Changed QoQ

353No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Mirion Technologies, Inc. (NYSE:MIR) showed up in the 13F filings of 353 institutional investors as of December 2025.

Collectively, these holders controlled 100.1% of Mirion Technologies's outstanding shares in December 2025, down from 107.4% in September 2025.
Their total shares held in MIR increased 3.86% from the prior quarter, while the number of investors in Mirion Technologies increased 58.3% year over year.
During the quarter, 223 of these 353 funds increased positions in MIR, 93 reduced exposure, and 37 held steady.
Institutional investors collectively held 255.79Mn shares in Mirion Technologies as of December 2025, up by 9.51Mn shares quarter on quarter, and up 58.14Mn shares year over year.
As of December 31, 2025, the biggest holder of Mirion Technologies is BlackRock, Inc. at 38.2Mn shares, representing 14.94% of shares outstanding.
The biggest buyers of Mirion Technologies for the quarter ending December 2025 included Goldman Sachs Group Inc (5.44Mn), Swedbank AB (2.79Mn), TCW GROUP INC (2.45Mn), BlackRock, Inc. (1.77Mn), Bank of New York Mellon Corp (1.72Mn).
Leading sellers of Mirion Technologies shares for the quarter ending December 2025 were T. Rowe Price Investment Management, Inc. (4.12Mn), Janus Henderson Group Plc (3.06Mn), DIMENSIONAL FUND ADVISORS LP (2.1Mn), MASSACHUSETTS FINANCIAL SERVICES CO /MA/ (1.73Mn), Alyeska Investment Group, L.P. (1.6Mn).
According to Business Quant data, leading holders of MIR for December 2025 are BlackRock, Inc. (38.2Mn), VANGUARD GROUP INC (30.35Mn), T. Rowe Price Investment Management, Inc. (17.44Mn), Goldman Sachs Group Inc (10.5Mn), State Street Corp (9.2Mn), FMR LLC (8.41Mn), COOPERMAN LEON G (8.38Mn), Swedbank AB (6.8Mn), GEODE CAPITAL MANAGEMENT, LLC (5.79Mn), UBS Group AG (4.85Mn).

353 Institutional Holders

262,186,532 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
T. Rowe Price Investment Management, Inc.	31 Dec, 2025	17,441,857	-4,124,785	-19.13%	$408,490.00
Goldman Sachs Group Inc	31 Dec, 2025	10,497,012	5,442,420	107.67%	$245,840,022.00
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
Swedbank AB	31 Dec, 2025	6,796,400	2,791,200	69.69%	$159,171,688.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	5,786,596	157,687	2.80%	$135,545,437.00
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
Invesco Ltd.	31 Dec, 2025	3,101,120	344,230	12.49%	$72,628,231.00
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

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