Mirion Technologies, Inc.
MIR- Exchange
- NYSE
- Industry
- Measuring & Controlling Devices, NEC
- SEC CIK
- 0001809987
In the last 90 days, Mirion Technologies, Inc. insiders filed 1 open-market purchase and 0 sales; 351 institutions reported holding it in 13F filings for Q2 2026, worth $4.70B in total; Maverick Capital is the only superinvestor holding it.
13F holders, Q1 2026
Institutional positions in Mirion Technologies, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 362
- +5 vs. Q4 2025
- Shares held
- 253.5M
- +32.3M (+14.6%) vs. Q4 2025
- Total value
- $4.71B
- −$467.0M (−9.0%) vs. Q4 2025
- New holders
- 62
- 136 more added
- Sold out
- 57
- 131 more reduced
8 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting MIR on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 351 | $4.70B |
| Q1 2026 | 362 | $4.71B |
| Q4 2025 | 365 | $5.91B |
| Q3 2025 | 343 | $5.93B |
| Q2 2025 | 302 | $4.46B |
| Q1 2025 | 230 | $2.69B |
| Q4 2024 | 224 | $3.38B |
| Q3 2024 | 176 | $2.27B |
| Q2 2024 | 155 | $2.12B |
| Q1 2024 | 143 | $2.14B |
| Q4 2023 | 125 | $1.93B |
| Q3 2023 | 127 | $1.40B |
| Q2 2023 | 124 | $1.53B |
| Q1 2023 | 117 | $1.45B |
| Q4 2022 | 119 | $1.01B |
| Q3 2022 | 121 | $1.27B |
| Q2 2022 | 115 | $921.8M |
| Q1 2022 | 108 | $1.20B |
| Q4 2021 | 93 | $1.52B |
| Q3 2021 | 4 | $16.4M |
| Q2 2021 | 1 | $20.8K |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Mirion Technologies, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Public Sector Pension Investment Board | 875,290 | $16.3M | 0.05% | +17,606+2.1% | Added |
| Fred Alger Management, LLC | 909,606 | $16.9M | 0.07% | +909,606 | New |
| Lord, Abbett & Co. LLC | 937,044 | $17.4M | 0.06% | −1,206,514−56.3% | Reduced |
| Jennison Associates LLC | 942,696 | $17.5M | 0.01% | −49,887−5.0% | Reduced |
| Alta Park Capital, LP | 977,138 | $18.2M | 2.92% | +414,616+73.7% | Added |
| Corsair Capital Management, L.P. | 982,419 | $18.3M | 2.72% | 00.0% | Unchanged |
| Raymond James Financial Inc | 1,075,652 | $18.9M | 0.01% | −459,167−29.9% | Reduced |
| Citigroup Inc | 1,048,104 | $19.5M | 0.01% | +670,190+177.3% | Added |
| Select Equity Group, L.P. | 1,055,468 | $19.6M | 0.10% | +286,435+37.2% | Added |
| Schroder Investment Management Group | 1,136,000 | $19.7M | 0.02% | +124,986+12.4% | Added |
| Allspring Global Investments Holdings, LLC | 1,059,030 | $19.8M | 0.03% | +28,800+2.8% | Added |
| BNP Paribas Arbitrage, SA | 1,111,397 | $20.7M | 0.01% | +207,168+22.9% | Added |
| Segall Bryant & Hamill, LLC | 1,111,874 | $20.7M | 0.30% | −57,815−4.9% | Reduced |
| Congress Asset Management Co | 1,114,061 | $20.7M | 0.15% | +1,114,061 | New |
| Voya Investment Management LLC | 1,168,228 | $21.7M | 0.02% | +288,378+32.8% | Added |
| Principal Financial Group Inc | 1,196,049 | $22.2M | 0.01% | −511,610−30.0% | Reduced |
| Bamco Inc | 1,213,748 | $22.6M | 0.07% | +563,748+86.7% | Added |
| Daiwa Securities Group Inc. | 1,217,497 | $22.6M | 0.07% | +1,170,497+2,490.4% | Added |
| Ameriprise Financial Inc | 1,289,690 | $24.0M | 0.01% | −1,046,620−44.8% | Reduced |
| TimesSquare Capital Management, LLC | 1,294,165 | $24.1M | 0.41% | +326,904+33.8% | Added |
| Brown Advisory Inc | 1,300,073 | $24.2M | 0.04% | −312,978−19.4% | Reduced |
| Davidson Kempner Capital Management LP | 1,314,819 | $24.4M | 0.43% | +386,306+41.6% | Added |
| Bank of America Corp | 1,355,298 | $25.2M | 0.00% | −3,572−0.3% | Reduced |
| Stephens Investment Management Group LLC | 1,374,876 | $25.6M | 0.35% | +564,933+69.7% | Added |
| Emerald Advisers, LLC | 1,381,574 | $25.7M | 0.81% | +244,428+21.5% | Added |
| Rockefeller Capital Management L.P. | 1,392,724 | $25.9M | 0.05% | +253,687+22.3% | Added |
| Troluce Capital Advisors LLC | 1,500,000 | $27.9M | 2.95% | +650,000+76.5% | Added |
| Massachusetts Financial Services Co | 1,589,259 | $29.5M | 0.01% | −2,074,220−56.6% | Reduced |
| Chescapmanager LLC | 1,659,137 | $30.8M | 4.93% | 00.0% | Unchanged |
| Vanguard Fiduciary Trust Co | 1,694,538 | $31.5M | 0.01% | +1,694,538 | New |
| Citadel Advisors LLC | 1,823,252 | $33.9M | 0.02% | +202,459+12.5% | Added |
| Conestoga Capital Advisors, LLC | 1,831,019 | $34.0M | 0.68% | −107,830−5.6% | Reduced |
| Nuveen, LLC | 1,949,992 | $36.3M | 0.01% | −62,920−3.1% | Reduced |
| Royal Bank of Canada | 1,961,404 | $36.5M | 0.01% | −186,580−8.7% | Reduced |
| Franklin Resources Inc | 1,996,144 | $37.1M | 0.01% | +119,021+6.3% | Added |
| Alliancebernstein L.P. | 1,653,429 | $38.7M | 0.01% | +1,332,930+415.9% | Added |
| TCW Group Inc | 2,238,426 | $41.6M | 0.31% | −214,153−8.7% | Reduced |
| Charles Schwab Investment Management Inc | 2,277,245 | $42.3M | 0.01% | −66,996−2.9% | Reduced |
| Morgan Stanley | 2,285,068 | $42.5M | 0.00% | +188,210+9.0% | Added |
| Invesco Ltd. | 2,294,250 | $42.7M | 0.00% | −806,870−26.0% | Reduced |
| Northern Trust Corp | 2,366,237 | $44.0M | 0.01% | +34,791+1.5% | Added |
| JPMorgan Chase & Co | 2,619,120 | $45.4M | 0.00% | +949,056+56.8% | Added |
| Two Creeks Capital Management, LP | 2,449,059 | $45.5M | 4.81% | −474,743−16.2% | Reduced |
| Maverick Capital LtdSuperinvestorMaverick Capital | 2,649,879 | $49.3M | 0.57% | +2,649,879 | New |
| Loomis Sayles & Co L P | 2,670,228 | $49.6M | 0.07% | −175,391−6.2% | Reduced |
| Alyeska Investment Group, L.P. | 2,701,580 | $50.2M | 0.14% | +1,170,363+76.4% | Added |
| American Century Companies Inc | 2,732,762 | $50.8M | 0.03% | +176,038+6.9% | Added |
| Swedbank AB | 3,159,950 | $58.7M | 0.06% | −238,250−7.0% | Reduced |
| UBS Group AG | 3,766,842 | $70.0M | 0.01% | −1,085,745−22.4% | Reduced |
| Janus Henderson Group PLC | 4,043,089 | $75.2M | 0.04% | −553,860−12.0% | Reduced |
| Bank of New York Mellon Corp | 4,536,732 | $84.3M | 0.02% | +1,459,787+47.4% | Added |
| Dimensional Fund Advisors LP | 4,694,288 | $87.2M | 0.02% | +591,730+14.4% | Added |
| Millennium Management LLC | 5,106,801 | $94.9M | 0.07% | +5,106,801 | New |
| Geode Capital Management, LLC | 5,940,175 | $110.4M | 0.01% | +153,579+2.7% | Added |
| FMR LLC | 6,551,692 | $121.8M | 0.01% | −1,862,608−22.1% | Reduced |
| Goldman Sachs Group Inc | 7,349,668 | $136.6M | 0.02% | +2,101,162+40.0% | Added |
| Cooperman Leon G | 8,383,441 | $155.8M | 5.11% | 00.0% | Unchanged |
| State Street Corp | 9,430,017 | $175.3M | 0.01% | +231,222+2.5% | Added |
| Vanguard Capital Management LLC | 10,505,195 | $195.3M | 0.00% | +10,505,195 | New |
| T. Rowe Price Investment Management, Inc. | 14,627,795 | $271.9M | 0.19% | −485,060−3.2% | Reduced |
| Vanguard Portfolio Management LLC | 17,905,722 | $332.9M | 0.02% | +17,905,722 | New |
| BlackRock, Inc. | 37,857,697 | $703.8M | 0.01% | −342,271−0.9% | Reduced |
| Hood River Capital Management LLC | 0 | $0 | 0.00% | −2,780,137−100.0% | Sold out |
| Driehaus Capital Management LLC | 0 | $0 | 0.00% | −2,299,122−100.0% | Sold out |
| Vaughan Nelson Investment Management, L.P. | 0 | $0 | 0.00% | −1,332,550−100.0% | Sold out |
| Arrowstreet Capital, Limited Partnership | 0 | $0 | 0.00% | −1,071,340−100.0% | Sold out |
| Telemark Asset Management, LLC | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Summit Partners Public Asset Management, LLC | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Castleark Management LLC | 0 | $0 | 0.00% | −348,130−100.0% | Sold out |
| Ghisallo Capital Management LLC | 0 | $0 | 0.00% | −250,000−100.0% | Sold out |
| Munro Partners | 0 | $0 | 0.00% | −222,720−100.0% | Sold out |
| EAM Investors, LLC | 0 | $0 | 0.00% | −193,324−100.0% | Sold out |
| Lisanti Capital Growth, LLC | 0 | $0 | 0.00% | −156,740−100.0% | Sold out |
| Sculptor Capital LP | 0 | $0 | 0.00% | −140,000−100.0% | Sold out |
| HRT Financial LP | 0 | $0 | 0.00% | −138,182−100.0% | Sold out |
| Ci Investments Inc. | 0 | $0 | 0.00% | −106,612−100.0% | Sold out |
| NEOS Investment Management LLC | 0 | $0 | 0.00% | −104,962−100.0% | Sold out |
| Credit Agricole S A | 0 | $0 | 0.00% | −103,179−100.0% | Sold out |
| Blackhawk Capital Partners LLC. | 0 | $0 | 0.00% | −93,407−100.0% | Sold out |
| Gotham Asset Management, LLC | 0 | $0 | 0.00% | −93,039−100.0% | Sold out |
| Verition Fund Management LLC | 0 | $0 | 0.00% | −89,100−100.0% | Sold out |
| Mariner, LLC | 0 | $0 | 0.00% | −62,504−100.0% | Sold out |
| PensionDanmark Pensionsforsikringsaktieselskab | 0 | $0 | 0.00% | −50,000−100.0% | Sold out |
| Dymon Asia Capital (Singapore) Pte. Ltd. | 0 | $0 | 0.00% | −34,774−100.0% | Sold out |
| Ostrum Asset Management | 0 | $0 | 0.00% | −34,380−100.0% | Sold out |
| Calamos Advisors LLC | 0 | $0 | 0.00% | −31,700−100.0% | Sold out |
| Laurion Capital Management LP | 0 | $0 | 0.00% | −28,188−100.0% | Sold out |
| Headlands Technologies LLC | 0 | $0 | 0.00% | −20,964−100.0% | Sold out |
| Toronto Dominion Bank | 0 | $0 | 0.00% | −17,746−100.0% | Sold out |
| Ethic Inc. | 0 | $0 | 0.00% | −16,271−100.0% | Sold out |
| Inceptionr LLC | 0 | $0 | 0.00% | −15,428−100.0% | Sold out |
| Ieq Capital, LLC | 0 | $0 | 0.00% | −14,522−100.0% | Sold out |
| Cerity Partners LLC | 0 | $0 | 0.00% | −12,610−100.0% | Sold out |
| Harbour Capital Advisors, LLC | 0 | $0 | 0.00% | −12,125−100.0% | Sold out |
| O'Shaughnessy Asset Management, LLC | 0 | $0 | 0.00% | −11,546−100.0% | Sold out |
| VARCOV Co. | 0 | $0 | 0.00% | −10,838−100.0% | Sold out |
| CIBC Asset Management Inc | 0 | $0 | 0.00% | −9,840−100.0% | Sold out |
| Weiss Asset Management LP | 0 | $0 | 0.00% | −9,720−100.0% | Sold out |
| Forum Financial Management, LP | 0 | $0 | 0.00% | −9,317−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −9,198−100.0% | Sold out |