MIR · Mirion Technologies, Inc. · Shareholders & Ownership
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 positionsNo 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 | As of | Notes |
|---|---|---|---|---|
| 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 |
|
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 |
|
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 |
|
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 |
|
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 |
|
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 |
|
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
Create a free account to page through every holder, filter by source and group by ultimate parent.