Mirion Technologies MIR Institutional Ownership

NYSE MIR

$16.65 -0.27 (-1.60%)

As of: Sep 9, 2026 · 3:59 PM EDT

Institutions by Trading Activity

349 Institutions

Increased 196 56.2%

Unchanged 37 10.6%

Reduced 116 33.2%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

107.60%

▲+2.82 pp QoQ

Shares Held by Institutions

263.14Mn

of 244.57Mn outstanding

▲+10.52% QoQ

Shares Outstanding

244.57Mn

-18.58Mn held outside 13F filers

Institutional Investors

349

filed 13F for Jun 2026

▼-8 vs prior quarter

Net Shares Added (QoQ)

+25.04Mn

accumulated since last quarter

Value of Holdings

$4.45Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Mirion Technologies, Inc. (NYSE:MIR) has 349 institutional investors with active 13F positions as of June 2026.

These investors held 107.6% of outstanding shares in June 2026, up from 104.8% in March 2026.
Their total shares held in MIR increased 10.52% from the prior quarter, while the number of investors in Mirion Technologies increased 16.33% year over year.
Of these 349 funds, 196 grew their exposure to Mirion Technologies, 116 cut back, and 37 maintained positions.
In total, institutional investors held 263.14Mn shares in Mirion Technologies as of June 2026, up by 25.04Mn shares quarter on quarter, and up 50.66Mn shares year over year.
BlackRock, Inc. holds the largest position in MIR at 38.26Mn shares as of June 30, 2026, or 15.65% of shares outstanding.
The biggest buyers of Mirion Technologies for the quarter ending June 2026 included Alyeska Investment Group, L.P. (6.83Mn), CONGRESS ASSET MANAGEMENT CO (5.57Mn), Jupiter Topco LLC (4.11Mn), Goldman Sachs Group Inc (3.06Mn), BAMCO INC /NY/ (2.69Mn).
The largest sellers of Mirion Technologies for the quarter ending June 2026 were MILLENNIUM MANAGEMENT LLC (4.12Mn), Bank of New York Mellon Corp (3.16Mn), CITADEL ADVISORS LLC (1.79Mn), ALLIANCEBERNSTEIN L.P. (1.32Mn), Franklin Resources Inc (1.11Mn).
Per Business Quant data, the top 10 holders of Mirion Technologies for the quarter ending June 2026 are BlackRock, Inc. (38.26Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (18.18Mn), T. Rowe Price Investment Management, Inc. (14.29Mn), VANGUARD CAPITAL MANAGEMENT LLC (10.61Mn), Goldman Sachs Group Inc (10.41Mn), State Street Corp (9.92Mn), Alyeska Investment Group, L.P. (9.53Mn), COOPERMAN LEON G (8.38Mn), FMR LLC (7.33Mn), CONGRESS ASSET MANAGEMENT CO (6.69Mn).

Form 13F Holdings

349 Institutional Holders

Report period 30 Jun, 2026

Total shares held 263.14Mn

Of outstanding 107.60%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	38,262,307	15.65%	▲404,610	+1.07%	$686.04Mn
2	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	18,179,850	7.43%	▲274,128	+1.53%	$325.96Mn
3	T. Rowe Price Investment Management, Inc.	0001897612	14,288,075	5.84%	▼339,720	-2.32%	$256.19K
4	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	10,613,869	4.34%	▲108,674	+1.03%	$190.31Mn
5	Goldman Sachs Group Inc	0000886982	10,406,605	4.26%	▲3,056,937	+41.59%	$186.59Mn
6	State Street Corp	0000093751	9,923,609	4.06%	▲493,592	+5.23%	$177.93Mn
7	Alyeska Investment Group, L.P.	0001453072	9,534,955	3.90%	▲6,833,375	+252.94%	$170.96Mn
8	COOPERMAN LEON G	0000898382	8,383,441	3.43%	0	0.00%	$150.32Mn
9	FMR LLC	0000315066	7,329,386	3.00%	▲777,694	+11.87%	$131.42Mn
10	CONGRESS ASSET MANAGEMENT CO	0000897378	6,685,434	2.73%	▲5,571,373	+500.10%	$119.87Mn
11	GEODE CAPITAL MANAGEMENT, LLC	0001214717	6,280,048	2.57%	▲339,873	+5.72%	$112.62Mn
12	MAVERICK CAPITAL LTD	0000934639	5,245,039	2.14%	▲2,595,160	+97.94%	$94.04Mn
13	DIMENSIONAL FUND ADVISORS LP	0000354204	4,859,755	1.99%	▲165,467	+3.52%	$87.13Mn
14	Jupiter Topco LLC	0002146052	4,114,766	1.68%	▲4,114,766	0.00%	$73.78Mn
15	BAMCO INC /NY/	0001017918	3,906,083	1.60%	▲2,692,335	+221.82%	$70.04Mn
16	Morgan Stanley	0000895421	3,896,754	1.59%	▲1,611,686	+70.53%	$69.87Mn
17	Neuberger Berman Group LLC	0001465109	3,199,539	1.31%	▲2,343,150	+273.61%	$57.37Mn
18	AMERICAN CENTURY COMPANIES INC	0000748054	3,176,241	1.30%	▲443,479	+16.23%	$56.95Mn
19	Invesco Ltd.	0000914208	2,769,589	1.13%	▲475,339	+20.72%	$49.66Mn
20	UBS Group AG	0001610520	2,686,713	1.10%	▼1,080,129	-28.67%	$48.17Mn

Showing 1 to 20 of 349 holders