Mirion TechnologiesMIR
13F holders, Q3 2025 (September 30)342holders +41
90new positions
47sold out
8famous investors
$23.25avg. 13F price*
At the end of Q3 2025, 342 institutions reported holding Mirion Technologies Inc. (MIR) in their 13F filings, up 41 from Q2 2025. 90 opened new positions and 47 sold out. The largest holders were BlackRock, Inc. ($847.4M), Vanguard Group Inc. ($707.5M) and T. Rowe Price Investment Management, Inc. ($501.6M). 8 famous investors held it, including Leon Cooperman (6.1% of Omega Advisors (Leon Cooperman)'s portfolio), Lee Ainslie (0.8% of Maverick Capital's portfolio) and Mario Gabelli (0.1% of GAMCO Investors's portfolio).
- Company
- Mirion Technologies Inc.
- CUSIP
- 60471A101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 90 | $352.9M |
| Exits | 47 | $174.1M |
All 13F filers, Q2 2025 → Q3 2025: 79,761,334 shares bought and 32,086,859 shares sold, net +47,674,475 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 342 holders
| BlackRock, Inc. | 0.01% | Add +114.1% | 36,430,491 | $847.4M |
| Vanguard Group Inc. | 0.01% | Add +28.0% | 30,418,327 | $707.5M |
| T. Rowe Price Investment Management, Inc. | 0.31% | Add +2.9% | 21,566,642 | $501.6M |
| FMR LLC | 0.01% | Add +858.6% | 9,078,301 | $211.2M |
| State Street Corp. | 0.01% | Add +73.1% | 8,816,346 | $205.1M |
| Omega Advisors (Leon Cooperman) | 6.09% | Add +17.7% | 8,383,441 | $195.0M |
| Janus Henderson Group PLC | 0.08% | Reduce -4.1% | 7,661,937 | $178.2M |
| Dimensional Fund Advisors LP | 0.03% | Reduce -10.7% | 6,206,933 | $144.4M |
| Geode Capital Management, LLC | 0.01% | Add +18.8% | 5,628,909 | $130.9M |
| Massachusetts Financial Services Co. | 0.04% | Add +40.6% | 5,391,772 | $125.4M |
| Goldman Sachs Group Inc. | 0.02% | Add +691.9% | 5,054,592 | $117.6M |
| UBS Group AG | 0.02% | Add +181.4% | 4,796,833 | $111.6M |
| Swedbank AB | 0.09% | Reduce -2.9% | 4,005,200 | $93.2M |
| Two Creeks Capital Management, LP | 6.02% | New | 3,598,763 | $83.7M |
| American Century Companies Inc. | 0.04% | Reduce -4.3% | 3,229,538 | $75.1M |
| Alyeska Investment Group, L.P. | 0.22% | Reduce -29.7% | 3,127,745 | $72.8M |
| Hood River Capital Management LLC | 0.76% | Add +87.9% | 2,763,284 | $64.3M |
| Loomis Sayles & Co. L P | 0.08% | Add +73.5% | 2,761,535 | $64.2M |
| Invesco Ltd. | 0.01% | Add +5.3% | 2,756,890 | $64.1M |
| Brown Advisory Inc. | 0.08% | Reduce -49.6% | 2,721,783 | $63.3M |
| Maverick Capital | 0.81% | Reduce -51.2% | 2,588,579 | $60.2M |
| Northern Trust Corp. | 0.01% | Add +21.6% | 2,349,786 | $54.7M |
| Royal Bank of Canada | 0.01% | Add +34.7% | 2,310,250 | $53.7M |
| Lord, Abbett & Co. LLC | 0.17% | Reduce -7.0% | 2,288,182 | $53.2M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +32.7% | 2,234,627 | $52.0M |
| Arrowstreet Capital, Limited Partnership | 0.03% | Reduce -12.2% | 2,001,858 | $46.6M |
| Driehaus Capital Management LLC | 0.33% | Reduce -1.0% | 1,987,869 | $46.2M |
| Raymond James Financial Inc. | 0.01% | Reduce -12.2% | 1,731,206 | $40.3M |
| Ameriprise Financial Inc. | 0.01% | Add +559.9% | 1,717,192 | $39.9M |
| Chescapmanager LLC | 6.16% | Add +24.9% | 1,659,137 | $38.6M |
| Nuveen, LLC | 0.01% | Add +2.5% | 1,589,703 | $37.0M |
| Bank of America Corp. | 0.00% | Add +2.6% | 1,419,752 | $33.0M |
| Principal Financial Group Inc. | 0.02% | Add +1114.7% | 1,401,252 | $32.6M |
| Bank of New York Mellon Corp | 0.01% | Add +103.3% | 1,360,925 | $31.7M |
| Conestoga Capital Advisors, LLC | 0.50% | New | 1,351,785 | $31.4M |
| Morgan Stanley | 0.00% | Reduce -10.9% | 1,313,907 | $30.6M |
| D. E. Shaw & Co. | 0.02% | Add +28.1% | 1,239,561 | $28.8M |
| Select Equity Group, L.P. | 0.11% | Reduce -43.7% | 1,141,264 | $26.5M |
| Emerald Advisers, LLC | 0.85% | Add +17.8% | 1,137,165 | $26.5M |
| Schroder Investment Management Group | 0.02% | Add +4.3% | 1,168,708 | $26.3M |
| Segall Bryant & Hamill, LLC | 0.35% | Add +2.5% | 1,116,098 | $26.0M |
| Victory Capital Management Inc. | 0.01% | Add +12.9% | 1,082,626 | $25.2M |
| Silvercrest Asset Management Group LLC | 0.16% | Reduce -22.8% | 1,064,797 | $24.8M |
| Jennison Associates LLC | 0.01% | Reduce -1.9% | 1,051,494 | $24.5M |
| Corsair Capital Management, L.P. | 4.32% | Reduce -65.4% | 1,045,797 | $24.3M |
| Franklin Resources Inc. | 0.01% | Add +55.7% | 1,040,067 | $24.2M |
| TimesSquare Capital Management, LLC | 0.34% | New | 1,013,339 | $23.6M |
| Rockefeller Capital Management L.P. | 0.04% | Reduce -8.5% | 971,583 | $22.6M |
| Public Sector Pension Investment Board | 0.08% | New | 956,160 | $22.2M |
| Artemis Investment Management LLP | 0.28% | Reduce -68.5% | 953,407 | $22.2M |
| Keystone Investors Pte Ltd. | 2.37% | New | 881,593 | $20.5M |
| Schwartz Investment Counsel Inc. | 0.67% | Reduce -10.5% | 854,300 | $19.9M |
| T. Rowe Price Associates Inc. | 0.00% | Add +393.3% | 834,330 | $19.4M |
| ArrowMark Colorado Holdings LLC | 0.35% | Reduce -51.8% | 809,220 | $18.8M |
| Pier Capital, LLC | 2.89% | Reduce -8.8% | 794,826 | $18.5M |
| Ghisallo Capital Management LLC | 0.59% | New | 774,900 | $18.0M |
| Nomura Holdings Inc. | 0.09% | Add +412.1% | 726,962 | $16.9M |
| Emerald Mutual Fund Advisers Trust | 0.85% | Add +27.3% | 704,496 | $16.4M |
| Legal & General Group Plc | 0.00% | Add +153.9% | 616,530 | $14.3M |
| Alta Park Capital, LP | 1.43% | New | 611,161 | $14.2M |
| Rhumbline Advisers | 0.01% | Add +91.1% | 608,834 | $14.2M |
| Ensign Peak Advisors, Inc | 0.02% | Reduce -1.1% | 594,306 | $13.8M |
| Nicholas Investment Partners, LP | 1.19% | Add +27.3% | 585,473 | $13.6M |
| Axiom Investors LLC | 0.10% | Add +45.7% | 572,290 | $13.3M |
| Allspring Global Investments Holdings, LLC | 0.02% | Add +2.0% | 567,587 | $13.1M |
| FIL Ltd | 0.01% | No change | 560,893 | $13.0M |
| GAMCO Investors | 0.12% | Reduce -6.3% | 526,619 | $12.2M |
| Yaupon Capital Management LP | 0.63% | New | 525,000 | $12.2M |
| Millennium Management | 0.01% | Reduce -81.9% | 521,021 | $12.1M |
| Telemark Asset Management, LLC | 1.10% | No change | 500,000 | $11.6M |
| Bornite Capital Management LP | 1.08% | Reduce -75.6% | 500,000 | $11.6M |
| Summit Partners Public Asset Management, LLC | 0.38% | Reduce -52.2% | 500,000 | $11.6M |
| Sculptor Capital LP | 0.26% | New | 500,000 | $11.6M |
| Baron Capital (BAMCO) | 0.03% | New | 500,000 | $11.6M |
| TD Asset Management Inc | 0.01% | Add +13.0% | 486,944 | $11.3M |
| Gabelli Funds LLC | 0.08% | Reduce -5.9% | 481,250 | $11.2M |
| Citigroup Inc. | 0.01% | Add +86.8% | 480,372 | $11.2M |
| Walleye Capital LLC | 0.09% | Add +454.4% | 454,552 | $10.6M |
| Peregrine Capital Management LLC | 0.31% | New | 443,066 | $10.3M |
| Sumitomo Mitsui DS Asset Management Company, Ltd | 0.08% | Add +76.8% | 417,790 | $9.7M |
| Swiss National Bank | 0.01% | Add +1.6% | 415,500 | $9.7M |
| Zacks Investment Management | 0.08% | Add +7.3% | 407,098 | $9.5M |
| Barclays PLC | 0.00% | Reduce -2.5% | 401,286 | $9.3M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -64.2% | 390,560 | $9.1M |
| Susquehanna International Group, LLP | 0.01% | Reduce -31.0% | 388,894 | $9.0M |
| Aperture Investors, LLC | 1.23% | Add +10.2% | 380,095 | $8.8M |
| Kingdon Capital Management, L.L.C. | 1.37% | Reduce -11.8% | 375,000 | $8.7M |
| Alliancebernstein L.P. | 0.00% | Add +60.6% | 368,415 | $8.6M |
| Burkehill Global Management, LP | 0.48% | New | 350,000 | $8.1M |
| Sei Investments Co. | 0.01% | Reduce -0.9% | 347,699 | $8.1M |
| Wells Fargo & Company | 0.00% | Add +15.4% | 345,927 | $8.0M |
| Pinnbrook Capital Management LP | 1.44% | New | 335,070 | $7.8M |
| Ardsley Advisory Partners LP | 1.17% | Reduce -29.1% | 328,220 | $7.6M |
| CANADA LIFE ASSURANCE Co | 0.01% | New | 324,608 | $7.3M |
| Essex Investment Management Co. LLC | 1.11% | Add +3.6% | 310,500 | $7.2M |
| Fortress Investment Group LLC | 0.95% | Add +19981.7% | 302,431 | $7.0M |
| Lazard Asset Management LLC | 0.01% | Add +37.6% | 299,956 | $7.0M |
| Two Sigma Investments, LP | 0.01% | Add +941.9% | 298,500 | $6.9M |
| AQR Capital Management | 0.00% | Reduce -6.4% | 292,338 | $6.8M |
| Empowered Funds, LLC | 0.07% | New | 291,064 | $6.8M |
"% of holder's portfolio" is MIR's weight in each manager's 13F, not the share of Mirion Technologies Inc. the manager owns.