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MIR · Mirion Technologies, Inc. · Shareholders & Ownership

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$14.70 -0.23 (-1.54%)
Market Cap
$3.72B
Shares
249.04M
Volume · Oct 19 3.49M Avg daily vol (3M) 4.04M

Every disclosed holder of MIR in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

Who Owns MIR

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group Shares % Out
Institutional (13F) 260,701,719 104.68%
Insiders (Forms 3, 4, 5) 0 0.00%
13D/G-only blocks 0 0.00%
Remaining 11,664,072 -4.68%
Registered funds (N-PORT, not summed) 131,742,903 52.90%

Shares outstanding: 249,037,647, the issuer's latest cover-page count restated onto today's split basis.

Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of MIR

# Holder Shares
1
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
38,262,307
1.1
iShares Core S&P Small-Cap ETF
Fund S000004313 · Registered fund · Jun 30, 2026
iShares Trust, not summed
14,739,838
1.2
iShares Russell 2000 ETF
Fund S000004344 · Registered fund · Jun 30, 2026
iShares Trust, not summed
6,285,136
1.3
iShares S&P Small-Cap 600 Growth ETF
Fund S000004314 · Registered fund · Jun 30, 2026
iShares Trust, not summed
2,198,559
1.4
iShares Russell 2000 Growth ETF
Fund S000004343 · Registered fund · Jun 30, 2026
iShares Trust, not summed
1,939,792
1.5
iShares Defense Industrials Active ETF
Fund S000092375 · Registered fund · Jul 31, 2026
BlackRock ETF Trust, not summed
511,784
2
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
18,179,850
3
T. Rowe Price Investment Management, Inc.
13F CIK 1897612 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
14,288,075
4
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
10,613,869
5
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
10,406,605
5.1
Goldman Sachs Mid Cap Value Fund
Fund S000009320 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
1,235,453
5.2
Goldman Sachs Variable Insurance Trust Mid Cap Value Fund
Fund S000009358 · Registered fund · Jun 30, 2026
Goldman Sachs Variable Insurance Trust, not summed
601,018
5.3
Goldman Sachs Future Tech Leaders Equity ETF
Fund S000071430 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
218,772
5.4
Goldman Sachs Small Cap Value Fund
Fund S000009323 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
200,761
5.5
Goldman Sachs Small/Mid Cap Growth Fund
Fund S000009322 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
174,470
6
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
9,923,609
6.1
State Street(R) SPDR(R) Portfolio S&P 600(TM) Small Cap ETF
Fund S000041317 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
2,239,233
6.2
State Street(R) SPDR(R) S & P 600(TM) Small Cap Growth ETF
Fund S000006990 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
1,402,841
6.3
State Street(R) SPDR(R) S&P Kensho New Economies Composite ETF
Fund S000063362 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
219,745
6.4
State Street(R) SPDR(R) S&P Kensho Future Security ETF
Fund S000059702 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
97,400
6.5
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
84,200
7
Alyeska Investment Group, L.P.
13F CIK 1453072 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
9,534,955
8
COOPERMAN LEON G
13F CIK 898382 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
8,383,441
9
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
7,372,559
10
FMR LLC
13F CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
7,329,386
10.1
Fidelity Small Cap Index Fund
Fund S000033638 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
2,647,390
10.2
Fidelity Extended Market Index Fund
Fund S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
1,266,501
10.3
VIP Contrafund Portfolio
Fund S000007724 · Registered fund · Jun 30, 2026
Variable Insurance Products Fund II, not summed
1,197,675
10.4
Fidelity MSCI Information Technology Index ETF
Fund S000042577 · Registered fund · Jul 31, 2026
FIDELITY COVINGTON TRUST, not summed
681,087
10.5
Fidelity Small Cap Growth Fund
Fund S000007193 · Registered fund · Jul 31, 2026
Fidelity Securities Fund, not summed
646,571
11
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
6,280,048
12
CONGRESS ASSET MANAGEMENT CO
13F CIK 897378 · Registered investment adviser · Sep 30, 2026
6,034,528
12.1
Congress Small Cap Growth Fund
Fund S000058028 · Registered fund · Jul 31, 2026
Professionally Managed Portfolios, not summed
2,725,000
12.2
Congress SMid Growth ETF
Fund S000081384 · Registered fund · Jul 31, 2026
Professionally Managed Portfolios, not summed
581,669
13
VANGUARD SMALL-CAP INDEX FUND
Fund S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
5,332,549
14
MAVERICK CAPITAL LTD
13F CIK 934639 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
5,245,039
15
VANGUARD INFORMATION TECHNOLOGY INDEX FUND
Fund S000004452 · Registered fund · May 31, 2026
VANGUARD WORLD FUND, not summed
5,162,495
16
GSAM Holdings LLC
13D CIK 1736027 · Dec 17, 2024
not summed
5,131,020
17
Logan Thomas D
Insider CIK 1486259 · May 6, 2026
Director, Chief Executive Officer, issuer-wide, not summed
5,113,455
18
DIMENSIONAL FUND ADVISORS LP
13F CIK 354204 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
4,859,755
18.1
U.S. SMALL CAP PORTFOLIO
Fund S000000971 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
941,381
18.2
Dimensional U.S. Small Cap ETF
Fund S000070906 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
799,913
18.3
Dimensional U.S. Core Equity 2 ETF
Fund S000070903 · Registered fund · Jul 31, 2026
Dimensional ETF Trust, not summed
578,655
18.4
U.S. CORE EQUITY 2 PORTFOLIO
Fund S000000980 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
264,231
18.5
U.S. MICRO CAP PORTFOLIO
Fund S000000948 · Registered fund · Jul 31, 2026
DFA INVESTMENT DIMENSIONS GROUP INC, not summed
247,751
19
Jupiter Topco LLC
13F CIK 2146052 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
4,114,766
20
BAMCO INC /NY/
13F CIK 1017918 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,906,083
20.1
BARON SMALL CAP FUND
Fund S000000584 · Registered fund · Jun 30, 2026
BARON INVESTMENT FUNDS TRUST (f/k/a BARON ASSET FUND), not summed
1,500,000
20.2
BARON DISCOVERY FUND
Fund S000042178 · Registered fund · Jun 30, 2026
BARON INVESTMENT FUNDS TRUST (f/k/a BARON ASSET FUND), not summed
1,200,000
21
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
3,896,754
21.1
E*TRADE No Fee Total Market Index Fund
Fund S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
222
22
VANGUARD SMALL-CAP VALUE INDEX FUND
Fund S000002847 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
3,376,579
23
NEUBERGER BERMAN GROUP LLC
13F CIK 1465109 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
3,199,539
24
AMERICAN CENTURY COMPANIES INC
13F CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
3,176,241
24.1
Small Cap Growth Fund
Fund S000006193 · Registered fund · Jul 31, 2026
American Century Mutual Funds, Inc., not summed
2,423,491
25
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
2,807,117
26
Janus Henderson Triton Fund
Fund S000010485 · Registered fund · Jun 30, 2026
Janus Investment Fund, not summed
2,801,535
27
Invesco Ltd.
13F CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,769,589
27.1
Invesco S&P SmallCap Momentum ETF
Fund S000003024 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
1,758,287
27.2
Invesco S&P SmallCap Information Technology ETF
Fund S000028301 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
493,628
27.3
Invesco RAFI US 1500 Small-Mid ETF
Fund S000013120 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
124,181
27.4
Invesco S&P SmallCap 600 Revenue ETF
Fund S000064596 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
47,572
27.5
Invesco S&P SmallCap 600 QVM Multi-Factor ETF
Fund S000072320 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
38,291
28
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
2,686,713
29
JPMORGAN CHASE & CO
13F CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
2,606,507
30
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
2,586,059
31
Swedbank AB
13F CIK 946431 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
2,531,200
32
LOOMIS SAYLES & CO L P
13F CIK 312348 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,525,188
32.1
Loomis Sayles Small Cap Growth Fund
Fund S000006705 · Registered fund · Jun 30, 2026
LOOMIS SAYLES FUNDS II, not summed
939,309
32.2
Loomis Sayles Small/Mid Cap Growth Fund
Fund S000049859 · Registered fund · Jun 30, 2026
LOOMIS SAYLES FUNDS II, not summed
105,025
33
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,447,222
34
TCW GROUP INC
13F CIK 850401 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
2,255,645
34.1
TCW Transform Systems ETF
Fund S000072458 · Registered fund · Jul 31, 2026
TCW ETF Trust, not summed
1,620,618
34.2
TCW Durable Growth ETF
Fund S000084289 · Registered fund · Jul 31, 2026
TCW ETF Trust, not summed
66,296
35
Nuveen, LLC
13F CIK 1871926 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
2,109,181
35.1
College Retirement Equities Fund - Total Global Stock Account
Fund S000005080 · Registered fund · Jun 30, 2026
College Retirement Equities Fund, not summed
822,970
35.2
Nuveen Small Cap Blend Index Fund
Fund S000005367 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
313,421
35.3
Nuveen Small Cap Select Fund
Fund S000005569 · Registered fund · Jul 31, 2026
Nuveen Investment Funds, Inc., not summed
240,021
35.4
Nuveen ESG Small-Cap ETF
Fund S000055815 · Registered fund · Jul 31, 2026
NuShares ETF Trust, not summed
224,719
35.5
Nuveen Equity Index Fund
Fund S000005360 · Registered fund · Jul 31, 2026
TIAA-CREF Funds, not summed
168,476
36
ROYAL BANK OF CANADA
13F CIK 1000275 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,782,618
37
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,723,956
38
Stephens Investment Management Group LLC
13F CIK 1314440 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,678,373
39
Chescapmanager LLC
13F CIK 1697162 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,659,137
40
Davidson Kempner Capital Management LP
13F CIK 1595082 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,619,998
41
SCHRODER INVESTMENT MANAGEMENT GROUP
13F CIK 1086619 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,594,840
42
Select Equity Group, L.P.
13F CIK 1592643 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,576,023
43
Troluce Capital Advisors LLC
13F CIK 1910321 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,539,212
44
VANGUARD TAX-MANAGED SMALL-CAP FUND
Fund S000004387 · Registered fund · Jun 30, 2026
VANGUARD TAX-MANAGED FUNDS, not summed
1,498,059
45
Rockefeller Capital Management L.P.
13F CIK 1739439 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,466,144
45.1
Rockefeller US Small Cap Core Fund
Fund S000080973 · Registered fund · Aug 31, 2026
Trust for Professional Managers, not summed
121,055
45.2
Rockefeller Climate Solutions Fund
Fund S000072137 · Registered fund · Aug 31, 2026
Trust for Professional Managers, not summed
68,791
46
TimesSquare Capital Management, LLC
13F CIK 1313816 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,400,642
47
Bank of New York Mellon Corp
13F CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,381,674
47.1
BNY Mellon US Small Cap Core Equity ETF
Fund S000067262 · Registered fund · Jul 31, 2026
BNY Mellon ETF Trust, not summed
9,330
48
EMERALD ADVISERS, LLC
13F CIK 1015083 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,364,780
49
Schopfer Brian
Insider CIK 1885701 · Sep 2, 2026
Chief Financial Officer, issuer-wide, not summed
1,333,225
50
Conestoga Capital Advisors, LLC
13F CIK 1163744 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,248,061
50.1
CONESTOGA SMALL CAP FUND
Fund S000004756 · Registered fund · Jun 30, 2026
Conestoga Funds, not summed
733,600

63 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 531 holders

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Key facts CIK 1809987 CUSIP 60471A101 13F (30d) 31 filings 31 filers Visit website Investor relations