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Mirion Technologies, Inc.

MIR
Exchange
NYSE
Industry
Measuring & Controlling Devices, NEC
SEC CIK
0001809987

In the last 90 days, Mirion Technologies, Inc. insiders filed 1 open-market purchase and 0 sales; 351 institutions reported holding it in 13F filings for Q2 2026, worth $4.70B in total; Maverick Capital is the only superinvestor holding it.

Q4 2025 vs. Q3 2025

How the institutions holding Mirion Technologies, Inc. changed between Q3 2025 and Q4 2025.

All holders in Q4 2025All holders in Q3 2025

13F holders of MIR: Q3 2025 compared with Q4 2025
MeasureQ3 2025Of which not filed for Q4 2025Q4 2025Change
Holders3434365+26
Shares255.0M88.1K252.2M−2.75M (−1.1%)
Value$5.93B$2.01M$5.91B−$22.0M (−0.4%)

4 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (82)

Institutions that held Mirion Technologies, Inc. at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to MIR in Q4 2025
InstitutionSharesValue% of portfolio
TCW Group Inc2,452,579$57.4M0.41%
Vaughan Nelson Investment Management, L.P.1,332,550$31.2M0.31%
Nomura Asset Management International Inc.854,745$20.0M0.03%
Troluce Capital Advisors LLC850,000$19.9M14.70%
Stephens Investment Management Group LLC809,943$19.0M0.25%
Oberweis Asset Management Inc607,800$14.2M0.52%
Neuberger Berman Group LLC567,671$13.3M0.01%
Bridgewater Associates, LP489,928$11.5M0.04%
Bank of Nova Scotia391,006$9.16M0.01%
Castleark Management LLC348,130$8.15M0.24%
Tredje AP-fonden280,788$6.58M0.05%
Wellington Management Group LLP248,775$5.83M0.00%
Thornburg Investment Management Inc226,209$5.30M0.07%
HRT Financial LP138,182$3.24M0.01%
Illinois Municipal Retirement Fund137,208$3.21M0.04%
UniSuper Management Pty Ltd129,502$3.03M0.02%
XTX Topco Ltd125,020$2.93M0.08%
First National Advisers, LLC111,199$2.60M0.36%
First National Bank of Omaha110,847$2.60M0.08%
NEOS Investment Management LLC104,962$2.46M0.01%
Tema ETFs LLC104,962$2.46M0.19%
Credit Agricole S A103,179$2.42M0.01%
Gotham Asset Management, LLC93,039$2.18M0.01%
Norges Bank92,105$2.16M0.00%
Pacer Advisors, Inc.80,127$1.88M0.00%
Connor, Clark & Lunn Investment Management Ltd.70,918$1.66M0.00%
DDD Partners, LLC63,038$1.48M0.09%
Stifel Financial Corp59,081$1.38M0.00%
Twinbeech Capital LP57,100$1.34M0.10%
Madison Asset Management, LLC56,644$1.33M0.02%
PensionDanmark Pensionsforsikringsaktieselskab50,000$1.17M0.01%
Zions Bancorporation, National Association44,771$1.05M0.05%
Qsemble Capital Management, LP44,319$1.04M0.09%
Hudson Bay Capital Management LP40,000$936.8K0.01%
La Banque Postale Asset Management SA37,090$868.6K0.01%
Ostrum Asset Management34,380$805.2K0.04%
Laurion Capital Management LP28,188$660.2K0.05%
Themes Management Co LLC24,739$579.4K0.46%
Headlands Technologies LLC20,964$491.0K0.04%
Marietta Investment Partners LLC19,953$467.3K0.09%
Blueshift Asset Management, LLC18,846$441.4K0.13%
SCP Investment, LP18,000$421.6K0.34%
Toronto Dominion Bank17,746$415.6K0.00%
New Age Alpha Advisors, LLC16,077$376.5K0.02%
CIBC World Markets Corp15,870$371.7K0.00%
Glenmede Trust Co NA15,623$365.9K0.00%
Inceptionr LLC15,428$361.3K0.10%
Tributary Capital Management, LLC14,800$346.6K0.03%
Vident Advisory, LLC14,128$330.9K0.00%
Harbour Capital Advisors, LLC12,125$288.9K0.06%
Amundi12,300$288.1K0.00%
Quantinno Capital Management LP11,286$264.3K0.00%
SBI Okasan Asset Management Co.Ltd.11,000$261.5K0.01%
VARCOV Co.10,838$253.8K0.10%
Aigen Investment Management, LP10,522$246.4K0.06%
CIBC Asset Management Inc9,840$230.5K0.00%
Weiss Asset Management LP9,720$227.6K0.00%
Atria Investments LLC9,650$226.0K0.00%
Schonfeld Strategic Advisors LLC9,198$215.4K0.00%
JustInvest LLC9,059$212.2K0.00%
Merit Financial Group, LLC8,574$200.8K0.00%
Jefferies Financial Group Inc.8,500$199.1K0.00%
Kestra Advisory Services, LLC7,536$176.5K0.00%
PEAK6 LLC6,974$163.3K0.00%
Pinnacle Wealth Planning Services, Inc.6,835$160.1K0.02%
Los Angeles Capital Management LLC888$25.8K0.00%
DV Trading LLC1,006$23.6K0.00%
SageView Advisory Group, LLC1,005$23.5K0.00%
Strive Financial Group ,LLC852$20.0K0.01%
Kemnay Advisory Services Inc.812$19.0K0.00%
Eurizon Capital SGR S.p.A.641$15.0K0.00%
Elequin Capital LP600$14.1K0.00%
Massmutual Trust Co FSB243$5.69K0.00%
High Note Wealth, LLC169$3.96K0.00%
Farmers & Merchants Investments Inc100$2.34K0.00%
Keating Financial Advisory Services, Inc.90$2.11K0.00%
Bellevue Asset Management, LLC66$1.54K0.00%
Ankerstar Wealth, LLC34$7960.00%
Trust Co20$4680.00%
Gilpin Wealth Management, LLC16$3750.00%
Rossby Financial, LCC9$2110.00%
Dunhill Financial, LLC4$1050.00%

Sold out (56)

Institutions that held Mirion Technologies, Inc. at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of MIR in Q4 2025
InstitutionShares, Q3 2025Value, Q3 2025
Maverick Capital LtdSuperinvestorMaverick Capital2,588,579$60.2M
Yaupon Capital Management LP525,000$12.2M
Millennium Management LLC521,021$12.1M
Bornite Capital Management LP500,000$11.6M
Susquehanna International Group, LLP388,894$9.05M
Kingdon Capital Management, L.L.C.375,000$8.72M
Pinnbrook Capital Management LP335,070$7.79M
Great West Life Assurance Co324,608$7.31M
Fortress Investment Group LLC302,431$7.03M
Two Sigma Investments, LP298,500$6.94M
Maven Securities LTD275,000$6.40M
Simplex Trading, LLC202,331$4.71M
Zimmer Partners, LP200,000$4.65M
Centiva Capital, LP155,000$3.61M
Element Capital Management LLC115,578$2.69M
Macquarie Group Ltd114,724$2.67M
Concentric Capital Strategies, LP114,483$2.66M
Polar Asset Management Partners Inc.105,000$2.44M
Monashee Investment Management LLC100,000$2.33M
Ovata Capital Management Ltd100,000$2.33M
Jackson Creek Investment Advisors LLC93,843$2.18M
Freestone Grove Partners LP77,415$1.80M
Jane Street Group, LLC55,760$1.30M
Brevan Howard Capital Management LP49,910$1.16M
Hel Ved Capital Management Ltd49,800$1.16M
Wolverine Asset Management LLC49,359$1.15M
Fund 1 Investments, LLC43,900$1.02M
IMC-Chicago, LLC42,689$992.9K
Groupama Asset Managment–$990.6K
Teacher Retirement System of Texas27,885$648.6K
Virtu Financial LLC27,771$646.0K
Polymer Capital Management (US) LLC27,682$643.9K
SummitTX Capital, L.P.25,482$592.7K
Mackenzie Financial Corp24,289$565.0K
Axq Capital, LP16,795$390.7K
CI Private Wealth, LLC12,411$288.7K
Diametric Capital, LP11,448$266.3K
Bailard, Inc.10,348$240.7K
FORA Capital, LLC9,436$219.5K
Verdence Capital Advisors LLC8,814$216.3K
Aster Capital Management (DIFC) Ltd8,070$187.7K
Torno Capital, LLC6,410$149.1K
Walleye Trading LLC2,463$57.3K
Advisory Services Network, LLC1,058$24.6K
Zazove Associates LLC1,000$23.3K
Principal Securities, Inc.714$16.6K
Rise Advisors, LLC579$13.5K
Optiver Holding B.V.514$12.0K
Groupe la Francaise400$7.66K
Caitong International Asset Management Co., Ltd290$6.75K
Ameriflex Group, Inc.188$4.37K
Stone House Investment Management, LLC90$2.09K
Wealthspire Advisors, LLC60$1.40K
SWAN Capital LLC50$1.16K
Tortoise Investment Management, LLC3$70
Cloud Capital Management, LLC39$0

Not filed for Q4 2025 yet (4)

Institutions that held Mirion Technologies, Inc. at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding MIR in Q3 2025 that haven't filed for Q4 2025
InstitutionShares, Q3 2025Value, Q3 2025
Wolverine Trading, LLC50,728$1.14M
CIBC Bancorp USA Inc.25,060$582.9K
Glenmede Investment Management, LP11,959$278.2K
Hemington Wealth Management346$8.00K