MIRION TECHNOLOGIES INC (MIR) Institutional Ownership Changes & 13F Activity

MIRION TECHNOLOGIES INC (MIR). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q4 2025). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Fmr Llc, Cooperman Leon G, Janus Henderson Group Plc, Two Creeks Capital Management, Lp, and Hood River Capital Management Llc.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Ensign Peak Advisors, IncBuy+55,463+9.3%649,769$15.22MQ4 2025Aug 18, 2026
Torno Capital, LlcSell-6,410-100.0%0$0.00Q4 2025Aug 14, 2026
Montanaro Asset Management LtdBuy+255,400—255,400$5.98MQ4 2025Mar 10, 2026
Bell Investment Advisors, IncBuy+302—302$7.07KQ4 2025Feb 24, 2026
Sunbelt Securities, Inc.Buy+69—69$1.62KQ4 2025Feb 20, 2026
Corient Private Wealth LlcBuy+14,510—14,510$338.69KQ4 2025Feb 19, 2026
Raymond James Financial IncBuy+1,534,819—1,534,819$36.26MQ4 2025Feb 18, 2026
State Of Tennessee, Department Of TreasuryBuy+74,501—74,501$1.85MQ4 2025Feb 18, 2026
Vident Advisory, LlcBuy+14,128—14,128$330.88KQ4 2025Feb 18, 2026
Newedge Advisors, LlcBuy+3,251—3,251$76.14KQ4 2025Feb 18, 2026
Strive Financial Group ,LlcBuy+852—852$19.95KQ4 2025Feb 18, 2026
Fmr LlcBuy+8,414,300—8,414,300$197.06MQ4 2025Feb 17, 2026
Cooperman Leon GBuy+8,383,441—8,383,441$196.34MQ4 2025Feb 17, 2026
Janus Henderson Group PlcBuy+4,596,949—4,596,949$107.66MQ4 2025Feb 17, 2026
Two Creeks Capital Management, LpBuy+2,923,802—2,923,802$68.48MQ4 2025Feb 17, 2026
Hood River Capital Management LlcBuy+2,780,137—2,780,137$65.11MQ4 2025Feb 17, 2026
Ameriprise Financial IncBuy+2,336,310—2,336,310$54.72MQ4 2025Feb 17, 2026
Northern Trust CorpBuy+2,331,446—2,331,446$54.60MQ4 2025Feb 17, 2026
T. Rowe Price Investment Management, Inc.Buy+2,329,002—2,329,002$54.55MQ4 2025Feb 17, 2026
Driehaus Capital Management LlcBuy+2,299,122—2,299,122$53.85MQ4 2025Feb 17, 2026
Royal Bank Of CanadaBuy+2,147,984—2,147,984$50.31MQ4 2025Feb 17, 2026
Citadel Advisors LlcBuy+1,620,793—1,620,793$37.96MQ4 2025Feb 17, 2026
Bank Of America CorpBuy+1,358,870—1,358,870$31.82MQ4 2025Feb 17, 2026
Rockefeller Capital Management L.P.Buy+1,139,037—1,139,037$26.68MQ4 2025Feb 17, 2026
Corsair Capital Management, L.P.Buy+982,419—982,419$23.01MQ4 2025Feb 17, 2026
Nomura Asset Management International Inc.Buy+854,745—854,745$20.02MQ4 2025Feb 17, 2026
Troluce Capital Advisors LlcBuy+850,000—850,000$19.91MQ4 2025Feb 17, 2026
Price T Rowe Associates IncBuy+834,330—834,330$19.54MQ4 2025Feb 17, 2026
Silvercrest Asset Management Group LlcBuy+818,244—818,244$19.16MQ4 2025Feb 17, 2026
Select Equity Group, L.P.Buy+769,033—769,033$18.01MQ4 2025Feb 17, 2026
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Frequently asked questions about MIR activity

  • Which institutional owners are buying MIR?

    Institutional owners buying MIR include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in MIR activity?

    "Buy" means an investor increased their reported position in MIR compared to the prior reporting period. This reflects growing exposure to MIRION TECHNOLOGIES INC (MIR) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in MIR increasing?

    Institutional interest in MIR can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.