Mirion TechnologiesMIR
13F holders, Q1 2025 (March 31)231holders +7
43new positions
39sold out
9famous investors
$14.51avg. 13F price*
At the end of Q1 2025, 231 institutions reported holding Mirion Technologies Inc. (MIR) in their 13F filings, up 7 from Q4 2024. 43 opened new positions and 39 sold out. The largest holders were Vanguard Group Inc. ($337.2M), T. Rowe Price Investment Management, Inc. ($300.3M) and BlackRock, Inc. ($234.0M). 9 famous investors held it, including Leon Cooperman (4.0% of Omega Advisors (Leon Cooperman)'s portfolio), Lee Ainslie (2.1% 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 Q4 2024 → Q1 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 43 | $51.2M |
| Exits | 39 | $113.5M |
All 13F filers, Q4 2024 → Q1 2025: 20,163,030 shares bought and 23,414,085 shares sold, net −3,251,055 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 231 holders
| Vanguard Group Inc. | 0.01% | Reduce -2.7% | 23,258,048 | $337.2M |
| T. Rowe Price Investment Management, Inc. | 0.20% | Add +1.6% | 20,710,389 | $300.3M |
| BlackRock, Inc. | 0.00% | Add +0.2% | 16,139,924 | $234.0M |
| Janus Henderson Group PLC | 0.07% | Add +3.1% | 8,587,664 | $125.6M |
| Maverick Capital | 2.10% | Add +30.4% | 8,056,109 | $116.8M |
| Dimensional Fund Advisors LP | 0.03% | Add +2.5% | 7,363,954 | $106.8M |
| Omega Advisors (Leon Cooperman) | 4.04% | No change | 7,025,000 | $101.9M |
| Brown Advisory Inc. | 0.12% | Add +45.9% | 5,560,461 | $80.6M |
| Swedbank AB | 0.10% | Reduce -11.1% | 5,387,000 | $78.1M |
| State Street Corp. | 0.00% | Reduce -1.2% | 5,139,569 | $74.5M |
| Geode Capital Management, LLC | 0.01% | Add +3.6% | 4,738,769 | $68.7M |
| Alyeska Investment Group, L.P. | 0.24% | Add +10.3% | 4,150,262 | $60.2M |
| American Century Companies Inc. | 0.03% | Add +43.9% | 3,432,814 | $49.8M |
| Corsair Capital Management, L.P. | 11.47% | Reduce -3.1% | 3,072,003 | $44.5M |
| Artemis Investment Management LLP | 0.67% | Add +37.1% | 2,998,435 | $43.5M |
| Arrowstreet Capital, Limited Partnership | 0.03% | Reduce -33.8% | 2,789,509 | $40.4M |
| Millennium Management | 0.04% | Reduce -17.3% | 2,567,660 | $37.2M |
| Lord, Abbett & Co. LLC | 0.13% | Add +1.3% | 2,399,864 | $34.8M |
| Select Equity Group, L.P. | 0.15% | Reduce -0.9% | 2,292,236 | $33.2M |
| ArrowMark Colorado Holdings LLC | 0.51% | Reduce -7.6% | 2,188,926 | $31.7M |
| Bornite Capital Management LP | 7.71% | Reduce -2.5% | 2,064,300 | $29.9M |
| Northern Trust Corp. | 0.00% | Reduce -3.5% | 1,971,182 | $28.6M |
| William Blair Investment Management, LLC | 0.07% | Reduce -43.1% | 1,731,391 | $25.1M |
| Raymond James Financial Inc. | 0.01% | Add +74.7% | 1,717,848 | $24.9M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +2.6% | 1,641,075 | $23.8M |
| ACK Asset Management LLC | 3.85% | Reduce -10.8% | 1,618,356 | $23.5M |
| UBS Group AG | 0.00% | Reduce -3.2% | 1,497,206 | $21.7M |
| Nuveen, LLC | 0.01% | — | 1,388,424 | $20.1M |
| Chescapmanager LLC | 4.01% | No change | 1,327,895 | $19.3M |
| Silvercrest Asset Management Group LLC | 0.14% | Add +35.4% | 1,310,960 | $19.0M |
| Morgan Stanley | 0.00% | Add +16.5% | 1,222,077 | $17.7M |
| Schroder Investment Management Group | 0.02% | Add +66.3% | 1,122,671 | $16.4M |
| Victory Capital Management Inc. | 0.02% | Add +3556.6% | 1,004,697 | $14.6M |
| Masters Capital Management LLC | 3.07% | No change | 1,000,000 | $14.5M |
| Schwartz Investment Counsel Inc. | 0.48% | Reduce -29.3% | 954,300 | $13.8M |
| Pier Capital, LLC | 2.29% | Add +43.1% | 941,480 | $13.7M |
| Rockefeller Capital Management L.P. | 0.03% | New | 938,237 | $13.6M |
| Jennison Associates LLC | 0.01% | Add +81.2% | 931,867 | $13.5M |
| Citadel Advisors | 0.01% | Add +717.4% | 909,252 | $13.2M |
| Summit Partners Public Asset Management, LLC | 0.62% | New | 896,000 | $13.0M |
| Emerald Advisers, LLC | 0.57% | Add +44.8% | 880,089 | $12.8M |
| Arosa Capital Management LP | 8.36% | Add +76.1% | 868,261 | $12.6M |
| FIL Ltd | 0.01% | Reduce -59.7% | 810,893 | $11.8M |
| Segall Bryant & Hamill, LLC | 0.16% | Add +49.9% | 711,349 | $10.3M |
| Bank of New York Mellon Corp | 0.00% | Add +1.2% | 669,138 | $9.7M |
| Royce & Associates LP | 0.11% | Add +47.6% | 668,643 | $9.7M |
| Qube Research & Technologies Ltd | 0.01% | Add +36.6% | 650,207 | $9.4M |
| Renaissance Technologies | 0.01% | Add +343.9% | 643,700 | $9.3M |
| Norges Bank | 0.00% | New | 602,500 | $8.7M |
| GAMCO Investors | 0.09% | Reduce -1.3% | 592,127 | $8.6M |
| Allspring Global Investments Holdings, LLC | 0.01% | Add +14.5% | 596,100 | $8.6M |
| Bank of America Corp. | 0.00% | Add +191.8% | 588,622 | $8.5M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -93.5% | 579,644 | $8.4M |
| Trexquant Investment LP | 0.10% | Add +25.1% | 567,609 | $8.2M |
| Gabelli Funds LLC | 0.06% | Reduce -5.8% | 524,250 | $7.6M |
| Emerald Mutual Fund Advisers Trust | 0.54% | Add +123.7% | 507,116 | $7.4M |
| Telemark Asset Management, LLC | 0.95% | No change | 500,000 | $7.3M |
| Ensign Peak Advisors, Inc | 0.01% | Add +5.1% | 496,147 | $7.2M |
| D. E. Shaw & Co. | 0.01% | Add +41.3% | 451,617 | $6.5M |
| Kingdon Capital Management, L.L.C. | 1.35% | Add +12.5% | 450,000 | $6.5M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +8.8% | 434,583 | $6.3M |
| Tudor Investment Corporation | 0.06% | Add +159.8% | 430,949 | $6.2M |
| TD Asset Management Inc | 0.01% | Add +1.9% | 415,034 | $6.0M |
| Swiss National Bank | 0.00% | Add +4.3% | 393,200 | $5.7M |
| Roubaix Capital, LLC | 2.86% | Add +177.4% | 379,098 | $5.5M |
| Nicholas Investment Partners, LP | 0.62% | Reduce -14.9% | 367,256 | $5.3M |
| Aperture Investors, LLC | 0.79% | Reduce -3.8% | 357,367 | $5.2M |
| Bastion Asset Management Inc. | 2.63% | New | 326,580 | $4.9M |
| Susquehanna International Group, LLP | 0.01% | Add +272.6% | 334,696 | $4.9M |
| Jane Street Group, LLC | 0.01% | Add +1487.0% | 328,184 | $4.8M |
| Invesco Ltd. | 0.00% | Reduce -34.4% | 321,838 | $4.7M |
| FMR LLC | 0.00% | Add +6.5% | 321,791 | $4.7M |
| First Trust Advisors LP | 0.00% | Add +190.5% | 317,407 | $4.6M |
| Rhumbline Advisers | 0.00% | Reduce -3.5% | 307,422 | $4.5M |
| Essex Investment Management Co. LLC | 0.91% | Reduce -0.8% | 301,873 | $4.4M |
| Wells Fargo & Company | 0.00% | Reduce -1.2% | 291,129 | $4.2M |
| JPMorgan Chase & Co. | 0.00% | Reduce -52.0% | 287,369 | $4.2M |
| Walleye Capital LLC | 0.05% | Add +177.6% | 286,320 | $4.2M |
| Rice Hall James & Associates, LLC | 0.23% | Reduce -0.1% | 270,106 | $3.9M |
| Deutsche Bank AG | 0.00% | Reduce -16.1% | 261,177 | $3.8M |
| Hollow Brook Wealth Management LLC | 1.10% | Add +22.0% | 256,742 | $3.7M |
| Barclays PLC | 0.00% | Reduce -28.2% | 253,540 | $3.7M |
| Schonfeld Strategic Advisors LLC | 0.02% | Reduce -1.5% | 248,969 | $3.6M |
| Legal & General Group Plc | 0.00% | Add +6.4% | 233,729 | $3.4M |
| Alliancebernstein L.P. | 0.00% | Add +1.3% | 219,330 | $3.2M |
| Verition Fund Management LLC | 0.02% | Reduce -19.4% | 201,406 | $2.9M |
| AQR Capital Management | 0.00% | Add +124.3% | 199,211 | $2.9M |
| Sei Investments Co. | 0.00% | Add +3.1% | 193,739 | $2.8M |
| Lazard Asset Management LLC | 0.00% | Reduce -31.2% | 191,755 | $2.8M |
| Sandler Capital Management | 0.86% | Reduce -68.2% | 181,787 | $2.6M |
| Alberta Investment Management Corp | 0.02% | Add +17.1% | 180,520 | $2.6M |
| Envestnet Asset Management Inc. | 0.00% | Add +818.0% | 177,968 | $2.6M |
| California State Teachers Retirement System | 0.00% | Reduce -1.6% | 177,403 | $2.6M |
| Ardsley Advisory Partners LP | 0.59% | Add +40.0% | 175,000 | $2.5M |
| Citigroup Inc. | 0.00% | Reduce -11.5% | 165,865 | $2.4M |
| Balyasny Asset Management L.P. | 0.01% | Add +349.4% | 164,032 | $2.4M |
| Dark Forest Capital Management LP | 0.10% | New | 151,996 | $2.2M |
| T. Rowe Price Associates Inc. | 0.00% | Add +7.0% | 150,130 | $2.2M |
| HRT Financial LP | 0.01% | Reduce -6.6% | 145,133 | $2.1M |
| Legato Capital Management LLC | 0.27% | Reduce -6.4% | 136,125 | $2.0M |
"% of holder's portfolio" is MIR's weight in each manager's 13F, not the share of Mirion Technologies Inc. the manager owns.