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Mirion Technologies (MIR) Institutional Ownership

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$16.24 -0.38 (-2.29%)
Closing price 03:59 PM Eastern
Extended Trading
$16.58 +0.34 (+2.09%)
As of 05:44 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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Institutional Ownership Changes (13F Filings) for Mirion Technologies (NYSE:MIR)

Current
Institutional Ownership
Percentage
78.51%
Number of
Institutional Buyers
(last 12 months)
232
Total
Institutional Inflows
(last 12 months)
$1.89B
Number of
Institutional Sellers
(last 12 months)
106
Total
Institutional Outflows
(last 12 months)
$1.29B
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MIR Institutional Buying and Selling by Quarter

Mirion Technologies Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
10/9/2026GK Wealth Management LLC5,283$75K0.0%N/A0.002%
10/9/2026GAMMA Investing LLC2,579$36K0.0%+65.1%0.001%
10/6/2026Congress Asset Management Co.6,034,528$85.21M0.5%-9.7%2.423%
10/2/2026 Versant Capital Management Inc2,505$35K0.0%+42.8%0.001%
9/9/2026Tidal Investments LLC840,683$15.07M0.0%+8.5%0.338%
9/8/2026Nykredit A S7,660$137K0.0%N/A0.003%
8/27/2026Corient Private Wealth LP11,931$214K0.0%-56.6%0.005%
8/25/2026VIRGINIA RETIREMENT SYSTEMS ET Al15,400$276K0.0%N/A0.006%
8/23/2026Troluce Capital Advisors LLC1,539,212$27.60M2.8%-23.0%0.618%
8/21/2026Nykredit A S7,660$137K0.0%N/A0.003%
8/21/2026B. Metzler seel. Sohn & Co. AG144,834$2.60M0.0%N/A0.058%
8/19/2026Wellington Management Group LLP1,098,987$19.71M0.0%+31.2%0.441%
8/11/2026Madison Asset Management LLC190,001$3.41M0.0%N/A0.076%
8/8/2026Summit Creek Advisors LLC198,422$3.56M1.2%N/A0.079%
8/6/2026Bank of New York Mellon Corp1,381,674$24.77M0.0%N/A0.552%
7/10/2026Tema ETFs LLC226,408$4.06M0.1%+45.4%0.090%
7/7/2026Balefire LLC12,618$226K0.0%N/A0.005%
6/18/2026Pacer Advisors Inc.64,182$1.19M0.0%-19.9%0.026%
5/22/2026Segall Bryant & Hamill LLC1,111,874$20.67M0.3%-4.9%0.444%
5/19/2026Bank of America Corp DE1,355,298$25.20M0.0%-0.3%0.541%
5/19/2026Janus Henderson Group PLC4,043,089$75.16M0.0%-12.0%1.615%
5/19/2026Altshuler Shaham Ltd13,147$244K0.0%+12.3%0.005%
5/18/2026Amundi36,691$682K0.0%+198.3%0.015%
5/18/2026California State Teachers Retirement System274,096$5.10M0.0%+22.2%0.109%
5/18/2026Royal Bank of Canada1,961,404$36.46M0.0%-8.7%0.783%
5/18/2026Empowered Funds LLC26,950$501K0.0%-90.3%0.011%
5/16/2026The Manufacturers Life Insurance Company111,658$2.08M0.0%-3.4%0.045%
5/16/2026Maverick Capital Ltd.2,649,879$49.26M0.6%N/A1.058%
5/16/2026Quantinno Capital Management LP41,705$775K0.0%+269.5%0.017%
5/16/2026Lazard Asset Management LLC322,421$5.99M0.0%+125.4%0.129%
5/15/2026Rice Hall James & Associates LLC196,899$3.66M0.2%-1.5%0.079%
5/15/2026Themes Management Co LLC38,837$722K0.4%+57.0%0.016%
5/15/2026Entropy Technologies LP38,507$716K0.0%N/A0.015%
5/14/2026Gabelli Funds LLC367,980$6.84M0.0%-14.5%0.147%
5/14/2026Gamco Investors INC. ET AL544,662$10.13M0.1%+0.5%0.217%
5/14/2026Bank of Nova Scotia380,186$7.07M0.0%-2.8%0.152%
5/14/2026Gibbs Wealth Management23,922$445K0.1%N/A0.010%
5/14/2026Sei Investments Co.458,359$8.52M0.0%+0.4%0.183%
5/14/2026State of Wyoming6,375$119K0.0%-10.1%0.003%
5/13/2026Cetera Investment Advisers24,978$464K0.0%+26.7%0.010%
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5/13/2026First Trust Advisors LP146,993$2.73M0.0%-57.8%0.059%
5/8/2026PNC Financial Services Group Inc.21,485$399K0.0%+17.6%0.009%
5/8/2026Madison Asset Management LLC124,323$2.31M0.0%+119.5%0.050%
5/7/2026Dimensional Fund Advisors LP4,694,288$87.24M0.0%+14.4%1.874%
5/7/2026KBC Group NV153,925$2.86M0.0%+1,907.1%0.061%
5/7/2026Swiss National Bank465,900$8.66M0.0%+0.4%0.186%
5/6/2026Jennison Associates LLC942,696$17.53M0.0%-5.0%0.376%
5/6/2026Assetmark Inc.3,454$64K0.0%+8,123.8%0.001%
5/6/2026Allspring Global Investments Holdings LLC1,059,030$19.76M0.0%+2.8%0.423%
5/5/2026Bastion Asset Management Inc.389,158$7.29M2.2%N/A0.155%
5/5/2026Bank of New York Mellon Corp4,536,732$84.34M0.0%+47.4%1.811%
5/5/2026Illinois Municipal Retirement Fund126,334$2.35M0.0%-7.9%0.050%
5/5/2026Sanctuary Advisors LLC29,619$551K0.0%-1.9%0.012%
5/5/2026Maryland State Retirement & Pension System35,626$662K0.0%-1.8%0.014%
5/4/2026Emerald Mutual Fund Advisers Trust873,466$16.24M0.8%+24.0%0.349%
5/4/2026Emerald Advisers LLC1,381,574$25.68M0.8%+21.5%0.551%
5/4/2026Principal Financial Group Inc.1,196,049$22.24M0.0%-30.0%0.477%
5/4/2026Schwartz Investment Counsel Inc.854,300$15.88M0.6%+7.6%0.341%
5/1/2026Commonwealth of Pennsylvania Public School Empls Retrmt SYS60,504$1.13M0.0%-1.4%0.024%
5/1/2026Fifth Third Bancorp227,118$4.22M0.0%+20,016.7%0.091%
5/1/2026Kornitzer Capital Management Inc. KS174,665$3.25M0.1%N/A0.070%
4/30/2026Oregon Public Employees Retirement Fund55,900$1.04M0.0%-1.4%0.022%
4/29/2026Swedbank AB3,159,950$58.74M0.1%-7.0%1.261%
4/28/2026Marietta Investment Partners LLC14,833$276K0.1%-25.7%0.006%
4/28/2026Stephens Investment Management Group LLC1,374,876$25.56M0.4%+69.7%0.549%
4/27/2026New York State Teachers Retirement System89,717$1.67M0.0%-8.3%0.036%
4/27/2026Elevation Point Wealth Partners LLC15,890$295K0.0%N/A0.006%
4/25/2026Strs Ohio15,000$279K0.0%-27.5%0.006%
4/25/2026Keybank National Association OH13,038$242K0.0%-4.8%0.005%
4/24/2026Conestoga Capital Advisors LLC1,831,019$34.04M0.7%-5.6%0.731%
4/24/2026Peregrine Capital Management LLC462,383$8.60M0.3%+14.7%0.185%
4/22/2026Janney Montgomery Scott LLC21,039$391K0.0%-5.9%0.008%
4/22/2026Pictet Asset Management Holding SA35,491$660K0.0%+6.3%0.014%
4/22/2026Sterling Capital Management LLC38,236$711K0.0%-44.4%0.015%
4/21/2026Louisiana State Employees Retirement System108,500$2.02M0.0%N/A0.043%
3/17/2026Rockefeller Capital Management L.P.1,139,037$26.68M0.0%+17.2%0.455%
3/10/2026Montanaro Asset Management Ltd255,400$5.98M1.7%+48.8%0.102%
3/9/2026Corient Private Wealth LLC14,510$339K0.0%+16.9%0.006%
2/24/2026Pacer Advisors Inc.80,127$1.88M0.0%N/A0.032%
2/19/2026T. Rowe Price Investment Management Inc.15,112,855$353.94M0.2%-29.9%5.955%
2/19/2026Invesco Ltd.3,101,120$72.63M0.0%+12.5%1.222%
2/19/2026Corient Private Wealth LLC14,510$339K0.0%+16.9%0.006%
2/18/2026Vident Advisory LLC14,128$331K0.0%N/A0.006%
2/18/2026State of Tennessee Department of Treasury74,501$1.85M0.0%+29.7%0.029%
2/18/2026NewEdge Advisors LLC3,251$76K0.0%-29.8%0.001%
2/18/2026Empowered Funds LLC278,820$6.53M0.1%-4.2%0.110%
2/18/2026XTX Topco Ltd125,020$2.93M0.1%N/A0.049%
2/18/2026Zacks Investment Management402,207$9.42M0.1%-1.2%0.158%
2/18/2026VARCOV Co.10,838$254K0.1%N/A0.004%
2/18/2026Wellington Management Group LLP248,775$5.83M0.0%N/A0.098%
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2/18/2026Toronto Dominion Bank17,746$416K0.0%N/A0.007%
2/18/2026Twinbeech Capital LP57,100$1.34M0.1%N/A0.022%
2/18/2026Janus Henderson Group PLC4,596,949$107.66M0.0%-40.0%1.811%
2/18/2026Gotham Asset Management LLC93,039$2.18M0.0%N/A0.037%
2/18/2026Bamco Inc. NY650,000$15.22M0.0%+30.0%0.256%
2/18/2026Boothbay Fund Management LLC173,855$4.07M0.1%+500.5%0.069%
2/18/2026Ardsley Advisory Partners LP325,000$7.61M0.8%-1.0%0.128%
2/18/2026Alta Park Capital LP562,522$13.17M1.6%-8.0%0.222%
2/18/2026Altshuler Shaham Ltd11,704$274K0.0%+5.1%0.005%
2/17/2026Schonfeld Strategic Advisors LLC9,198$215K0.0%N/A0.004%


MIR Institutional Ownership - Frequently Asked Questions

During the previous two years, 372 institutional investors and hedge funds held shares of Mirion Technologies. The most heavily invested institutionals were Vanguard Group Inc. ($710.71M), Tudor Investment Corp ET AL ($407.05M), T. Rowe Price Investment Management Inc. ($353.94M), State Street Corp ($215.44M), Cooperman Leon G ($195.00M), Geode Capital Management LLC ($135.55M), and Goldman Sachs Group Inc. ($122.92M).Learn more on Mirion Technologies' institutional investors.

78.51% of Mirion Technologies' stock is owned by institutional investors. Learn more on MIR's institutional investor holdings.

Of the 347 institutional investors that purchased Mirion Technologies' stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: Tudor Investment Corp ET AL ($17.59M), Vanguard Group Inc. ($6.88M), Brown Advisory Inc. ($5.56M), Bank of New York Mellon Corp ($4.58M), Arrowstreet Capital Limited Partnership ($4.20M), Artemis Investment Management LLP ($4.02M), and Two Creeks Capital Management LP ($3.60M).

Institutional investors have bought a total of 83,072,030 shares in the last 24 months. This purchase volume represents approximately $1.89B in transactions.

Of the 106 institutional investors that sold Mirion Technologies' stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: T. Rowe Price Investment Management Inc. ($25.69M), Janus Henderson Group PLC ($3.62M), Alyeska Investment Group L.P. ($2.92M), Dimensional Fund Advisors LP ($2.84M), Millennium Management LLC ($2.36M), Massachusetts Financial Services Co. MA ($1.73M), and Swedbank AB ($1.57M).

Institutional investors have sold a total of 55,971,344 shares in the last 24 months. This volume of shares sold represents approximately $1.29B in transactions.


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Institutional ownership data for NYSE:MIR is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 10/9/2026. New 13F filings are added each quarter as they're published.
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