Mirion TechnologiesMIR
13F holders, Q4 2025 (December 31)365holders +23
68new positions
55sold out
8famous investors
$23.43avg. 13F price*
At the end of Q4 2025, 365 institutions reported holding Mirion Technologies Inc. (MIR) in their 13F filings, up 23 from Q3 2025. 68 opened new positions and 55 sold out. The largest holders were BlackRock, Inc. ($894.6M), Vanguard Group Inc. ($710.7M) and T. Rowe Price Investment Management, Inc. ($353.9M). 8 famous investors held it, including Leon Cooperman (6.5% of Omega Advisors (Leon Cooperman)'s portfolio), Mario Gabelli (0.1% of GAMCO Investors's portfolio) and Ray Dalio (0.0% of Bridgewater Associates's portfolio).
- Company
- Mirion Technologies Inc.
- CUSIP
- 60471A101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 68 | $249.9M |
| Exits | 55 | $193.5M |
All 13F filers, Q3 2025 → Q4 2025: 30,900,476 shares bought and 34,732,416 shares sold, net −3,831,940 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 365 holders
| BlackRock, Inc. | 0.02% | Add +4.9% | 38,199,968 | $894.6M |
| Vanguard Group Inc. | 0.01% | Reduce -0.2% | 30,346,328 | $710.7M |
| T. Rowe Price Investment Management, Inc. | 0.22% | Reduce -29.9% | 15,112,855 | $353.9M |
| State Street Corp. | 0.01% | Add +4.3% | 9,198,795 | $215.4M |
| FMR LLC | 0.01% | Reduce -7.3% | 8,414,300 | $197.1M |
| Omega Advisors (Leon Cooperman) | 6.51% | No change | 8,383,441 | $196.3M |
| Geode Capital Management, LLC | 0.01% | Add +2.8% | 5,786,596 | $135.5M |
| Goldman Sachs Group Inc. | 0.02% | Add +3.8% | 5,248,506 | $122.9M |
| UBS Group AG | 0.02% | Add +1.2% | 4,852,587 | $113.6M |
| Janus Henderson Group PLC | 0.05% | Reduce -40.0% | 4,596,949 | $107.7M |
| Dimensional Fund Advisors LP | 0.02% | Reduce -33.9% | 4,102,558 | $96.1M |
| Massachusetts Financial Services Co. | 0.03% | Reduce -32.0% | 3,663,479 | $85.8M |
| Swedbank AB | 0.08% | Reduce -15.2% | 3,398,200 | $79.6M |
| Invesco Ltd. | 0.01% | Add +12.5% | 3,101,120 | $72.6M |
| Bank of New York Mellon Corp | 0.01% | Add +126.1% | 3,076,945 | $72.1M |
| Two Creeks Capital Management, LP | 5.61% | Reduce -18.8% | 2,923,802 | $68.5M |
| Loomis Sayles & Co. L P | 0.08% | Add +3.0% | 2,845,619 | $66.6M |
| Hood River Capital Management LLC | 0.71% | Add +0.6% | 2,780,137 | $65.1M |
| American Century Companies Inc. | 0.03% | Reduce -20.8% | 2,556,724 | $59.9M |
| TCW Group Inc. | 0.41% | New | 2,452,579 | $57.4M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +4.9% | 2,344,241 | $54.9M |
| Ameriprise Financial Inc. | 0.01% | Add +36.0% | 2,336,310 | $54.7M |
| Northern Trust Corp. | 0.01% | Reduce -0.8% | 2,331,446 | $54.6M |
| Driehaus Capital Management LLC | 0.37% | Add +15.7% | 2,299,122 | $53.8M |
| Royal Bank of Canada | 0.01% | Reduce -7.0% | 2,147,984 | $50.3M |
| Lord, Abbett & Co. LLC | 0.16% | Reduce -6.3% | 2,143,558 | $50.2M |
| Morgan Stanley | 0.00% | Add +59.6% | 2,096,858 | $49.1M |
| Nuveen, LLC | 0.01% | Add +26.6% | 2,012,912 | $47.1M |
| Artemis Investment Management LLP | 0.56% | Add +106.8% | 1,971,711 | $46.2M |
| Conestoga Capital Advisors, LLC | 0.76% | Add +43.4% | 1,938,849 | $45.4M |
| Franklin Resources Inc. | 0.01% | Add +80.5% | 1,877,123 | $44.0M |
| Principal Financial Group Inc. | 0.02% | Add +21.9% | 1,707,659 | $40.0M |
| JPMorgan Chase & Co. | 0.00% | Add +600.7% | 1,670,064 | $39.1M |
| Chescapmanager LLC | 6.41% | No change | 1,659,137 | $38.9M |
| Citadel Advisors | 0.03% | Add +753.8% | 1,620,793 | $38.0M |
| Brown Advisory Inc. | 0.05% | Reduce -40.7% | 1,613,051 | $37.8M |
| Raymond James Financial Inc. | 0.01% | Reduce -11.3% | 1,534,819 | $36.3M |
| Alyeska Investment Group, L.P. | 0.10% | Reduce -51.0% | 1,531,217 | $35.9M |
| Bank of America Corp. | 0.00% | Reduce -4.3% | 1,358,870 | $31.8M |
| Vaughan Nelson Investment Management, L.P. | 0.30% | New | 1,332,550 | $31.2M |
| Segall Bryant & Hamill, LLC | 0.37% | Add +4.8% | 1,169,689 | $27.4M |
| Rockefeller Capital Management L.P. | 0.05% | Add +17.2% | 1,139,037 | $26.7M |
| Emerald Advisers, LLC | 0.82% | Reduce 0.0% | 1,137,146 | $26.6M |
| Arrowstreet Capital, Limited Partnership | 0.01% | Reduce -46.5% | 1,071,340 | $25.1M |
| Allspring Global Investments Holdings, LLC | 0.04% | Add +81.5% | 1,030,230 | $24.6M |
| Schroder Investment Management Group | 0.02% | Reduce -13.5% | 1,011,014 | $24.0M |
| Jennison Associates LLC | 0.01% | Reduce -5.6% | 992,583 | $23.2M |
| Corsair Capital Management, L.P. | 3.81% | Reduce -6.1% | 982,419 | $23.0M |
| TimesSquare Capital Management, LLC | 0.34% | Reduce -4.5% | 967,261 | $22.7M |
| Davidson Kempner Capital Management LP | 0.45% | Add +1138.0% | 928,513 | $21.7M |
| BNP Paribas Financial Markets | 0.01% | Add +314.9% | 904,229 | $21.2M |
| Voya Investment Management LLC | 0.02% | Add +1970.4% | 879,850 | $20.6M |
| Wells Fargo & Company | 0.00% | Add +151.6% | 870,256 | $20.4M |
| Public Sector Pension Investment Board | 0.07% | Reduce -10.3% | 857,684 | $20.1M |
| Nomura Asset Management International Inc. | 0.03% | — | 854,745 | $20.0M |
| Troluce Capital Advisors LLC | 15.40% | New | 850,000 | $19.9M |
| Federated Hermes, Inc. | 0.03% | Add +1787.3% | 848,570 | $19.9M |
| T. Rowe Price Associates Inc. | 0.00% | No change | 834,330 | $19.5M |
| Silvercrest Asset Management Group LLC | 0.13% | Reduce -23.1% | 818,244 | $19.2M |
| Stephens Investment Management Group LLC | 0.25% | New | 809,943 | $19.0M |
| Schwartz Investment Counsel Inc. | 0.65% | Reduce -7.0% | 794,300 | $18.6M |
| Select Equity Group, L.P. | 0.08% | Reduce -32.6% | 769,033 | $18.0M |
| Nomura Holdings Inc. | 0.05% | Add +4.7% | 760,733 | $17.8M |
| Axiom Investors LLC | 0.15% | Add +26.1% | 721,496 | $16.9M |
| Pier Capital, LLC | 2.68% | Reduce -9.7% | 717,392 | $16.8M |
| ArrowMark Colorado Holdings LLC | 0.37% | Reduce -11.5% | 716,065 | $16.8M |
| Emerald Mutual Fund Advisers Trust | 0.80% | No change | 704,496 | $16.5M |
| Baron Capital (BAMCO) | 0.04% | Add +30.0% | 650,000 | $15.2M |
| Ensign Peak Advisors, Inc | 0.03% | Add +9.3% | 649,769 | $15.2M |
| Nicholas Investment Partners, LP | 1.24% | Add +9.6% | 641,660 | $15.0M |
| D. E. Shaw & Co. | 0.01% | Reduce -49.2% | 629,175 | $14.7M |
| Rhumbline Advisers | 0.01% | Add +1.7% | 619,284 | $14.5M |
| Legal & General Group Plc | 0.00% | Reduce -1.1% | 609,891 | $14.3M |
| Oberweis Asset Management Inc./ | 0.52% | New | 607,800 | $14.2M |
| Deutsche Bank AG | 0.00% | Add +206.2% | 578,409 | $13.5M |
| Neuberger Berman Group LLC | 0.01% | New | 567,671 | $13.3M |
| Alta Park Capital, LP | 1.59% | Reduce -8.0% | 562,522 | $13.2M |
| GAMCO Investors | 0.12% | Add +2.9% | 541,929 | $12.7M |
| Telemark Asset Management, LLC | 1.17% | No change | 500,000 | $11.7M |
| Summit Partners Public Asset Management, LLC | 0.33% | No change | 500,000 | $11.7M |
| Bridgewater Associates | 0.04% | New | 489,928 | $11.5M |
| Swiss National Bank | 0.01% | Add +11.7% | 464,200 | $10.9M |
| Sei Investments Co. | 0.01% | Add +31.3% | 456,512 | $10.7M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +13.6% | 443,832 | $10.4M |
| Gabelli Funds LLC | 0.07% | Reduce -10.6% | 430,250 | $10.1M |
| Victory Capital Management Inc. | 0.01% | Reduce -62.5% | 405,891 | $9.5M |
| Peregrine Capital Management LLC | 0.29% | Reduce -9.0% | 403,124 | $9.4M |
| Tidal Investments LLC | 0.04% | Add +1839.8% | 403,036 | $9.4M |
| Zacks Investment Management | 0.07% | Reduce -1.2% | 402,207 | $9.4M |
| Sumitomo Mitsui DS Asset Management Company, Ltd | 0.07% | Reduce -4.4% | 399,543 | $9.4M |
| Bank of Nova Scotia | 0.01% | New | 391,006 | $9.2M |
| Citigroup Inc. | 0.01% | Reduce -21.3% | 377,914 | $8.9M |
| Barclays PLC | 0.00% | Reduce -6.8% | 374,006 | $8.8M |
| Burkehill Global Management, LP | 0.57% | No change | 350,000 | $8.2M |
| Castleark Management LLC | 0.24% | New | 348,130 | $8.2M |
| First Trust Advisors LP | 0.01% | Add +29.3% | 348,104 | $8.2M |
| TD Asset Management Inc | 0.01% | Reduce -28.5% | 348,074 | $8.2M |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 0.01% | Add +18.1% | 325,766 | $7.6M |
| Ardsley Advisory Partners LP | 0.97% | Reduce -1.0% | 325,000 | $7.6M |
| Alliancebernstein L.P. | 0.00% | Reduce -13.0% | 320,499 | $7.5M |
"% of holder's portfolio" is MIR's weight in each manager's 13F, not the share of Mirion Technologies Inc. the manager owns.