MIRION TECHNOLOGIES INC MIR
COM CL A · Common Stock · CUSIP 60471A101
Company in the United States
- SectorTechnology
- IndustryMeasuring & Controlling Devices, NEC
- HeadquartersAtlanta, GA
- Websitemirion.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($2.2m this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $21.53. Options: 16 managers hold calls ($77.7m notional), 12 hold puts ($50.8m).
Trends to Q2 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 121 |
| Q4 2022 | 120 |
| Q1 2023 | 118 |
| Q2 2023 | 125 |
| Q3 2023 | 128 |
| Q4 2023 | 126 |
| Q1 2024 | 144 |
| Q2 2024 | 157 |
| Q3 2024 | 178 |
| Q4 2024 | 226 |
| Q1 2025 | 232 |
| Q2 2025 | 304 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2023 | 79 | 40 |
| Q4 2023 | 62 | 59 |
| Q1 2024 | 79 | 59 |
| Q2 2024 | 93 | 65 |
| Q3 2024 | 108 | 57 |
| Q4 2024 | 145 | 78 |
| Q1 2025 | 136 | 104 |
| Q2 2025 | 212 | 93 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2024 | $887.4k | $1.5m | 1.64 |
| Q4 2024 | $38.1m | $2.1m | 0.06 |
| Q1 2025 | $17.0m | $689.4k | 0.04 |
| Q2 2025 | $77.7m | $50.8m | 0.65 |
Biggest buyers
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | New | +3.8m |
| ROYAL BANK OF CANADA | Added | +3.3m |
| Invesco Ltd. | Added | +2.3m |
| Driehaus Capital Management LLC | New | +2.0m |
| LOOMIS SAYLES & CO L P | New | +1.6m |
| Hood River Capital Management LLC | New | +1.5m |
| BlackRock, Inc. | Added | +872.7k |
| GROUPAMA ASSET MANAGMENT | New | +800.0k |
| BANK OF AMERICA CORP /DE/ | Added | +794.6k |
| TCW GROUP INC | New | +731.5k |
Biggest sellers
| MAVERICK CAPITAL LTD | Reduced | -2.7m |
| MASTERS CAPITAL MANAGEMENT LLC | Sold out | -1.0m |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | Reduced | -725.5k |
| Arosa Capital Management LP | Reduced | -688.0k |
| NORGES BANK | Sold out | -602.5k |
| JANUS HENDERSON GROUP PLC | Reduced | -599.3k |
| Trexquant Investment LP | Sold out | -567.6k |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | -527.8k |
| ArrowMark Colorado Holdings LLC | Reduced | -511.4k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Reduced | -508.3k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $17.1m796.3k shares |
| MASTERS CAPITAL MANAGEMENT LLC | New | $10.8m500.0k shares |
| SG Americas Securities, LLC | New | $10.7m984.0k shares |
| PEAK6 LLC | Added | $9.7m450.4k shares |
| D. E. Shaw & Co., Inc. | New | $8.3m384.0k shares |
| GROUP ONE TRADING LLC | Added | $7.1m329.9k shares |
| Walleye Trading LLC | New | $2.7m124.8k shares |
| Jefferies Financial Group Inc. | Unchanged | $2.6m120.0k shares |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | New | $2.4m110.0k shares |
| SIMPLEX TRADING, LLC | Added | $2.0m94.1k shares |
Biggest puts
| SIMPLEX TRADING, LLC | Added | $10.0m465.3k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | $9.9m458.1k shares |
| D. E. Shaw & Co., Inc. | New | $8.3m384.0k shares |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | New | $6.5m300.0k shares |
| GROUP ONE TRADING LLC | Added | $5.0m232.5k shares |
| CITADEL ADVISORS LLC | Added | $4.7m219.8k shares |
| Walleye Trading LLC | New | $3.2m149.6k shares |
| JANE STREET GROUP, LLC | New | $2.1m97.6k shares |
| CAPITAL FUND MANAGEMENT S.A. | New | $510.3k23.7k shares |
| WOLVERINE TRADING, LLC | New | $486.3k22.4k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| BlackRock, Inc. 13G · institution filed 2025-10-02 | 14.8% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 7.4% |
| T. Rowe Price Investment Management, Inc. 13G · institution filed 2026-02-17 | 6.1% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-30 | 5.0% |
Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-27; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC), KUWAIT INVESTMENT AUTHORITY ON BEHALF OF THE GOVT OF KUWAIT (4.1%, 2026-01-21)
Insider purchases and sales in Q2 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q3 2023 | 0 | — | 0 | — | — |
| Q4 2023 | 0 | — | 0 | — | — |
| Q1 2024 | 0 | — | 1 | $1.0m | $1.0m |
| Q2 2024 | 0 | — | 3 | $351.7k | $267.8k |
| Q3 2024 | 0 | — | 3 | $624.0k | $55.0k |
| Q4 2024 | 0 | — | 3 | $941.6k | — |
| Q1 2025 | 0 | — | 0 | — | — |
| Q2 2025 | 0 | — | 2 | $11.9m | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-06-25 | Schopfer Brian Chief Financial Officer | Sold | $1.6m75.0k shares |
| 2025-05-21 | Kingsley Lawrence D Director · By Diane Kingsley Revocable Trust | Sold | $6.3m350.0k shares |
| 2025-05-21 | Kingsley Lawrence D Director · By Lawrence D. Kingsley 2015 Family Irrevocable Trust | Sold | $2.7m150.0k shares |
| 2025-05-21 | Schopfer Brian Chief Financial Officer | Sold | $1.4m75.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2025
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.01% of their portfolio | 23.8m $511.7m | Added +508.5k |
| T. Rowe Price Investment Management, Inc. 0.28% of their portfolio | 21.0m $451.2m | Added +247.1k |
| BlackRock, Inc. 0.01% of their portfolio | 17.0m $366.3m | Added +872.7k |
| JANUS HENDERSON GROUP PLC 0.08% of their portfolio | 8.0m $172.0m | Reduced -599.3k |
| COOPERMAN LEON G 5.39% of their portfolio | 7.1m $153.4m | Added +100.0k |
| DIMENSIONAL FUND ADVISORS LP 0.03% of their portfolio | 6.9m $149.6m | Reduced -416.6k |
| BROWN ADVISORY INC 0.15% of their portfolio | 5.4m $116.3m | Reduced -160.1k |
| MAVERICK CAPITAL LTD 1.75% of their portfolio | 5.3m $114.3m | Reduced -2.7m |
| STATE STREET CORP 0.00% of their portfolio | 5.1m $109.7m | Reduced -45.5k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 4.7m $102.0m | Added +471 |
| Alyeska Investment Group, L.P. 0.34% of their portfolio | 4.4m $95.7m | Added +296.6k |
| Swedbank AB 0.10% of their portfolio | 4.1m $88.8m | First filing |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.03% of their portfolio | 3.8m $82.5m | New |
| ROYAL BANK OF CANADA 0.01% of their portfolio | 3.4m $73.8m | Added +3.3m |
| AMERICAN CENTURY COMPANIES INC 0.04% of their portfolio | 3.4m $72.6m | Reduced -59.5k |
| Artemis Investment Management LLP 0.84% of their portfolio | 3.0m $65.2m | Added +30.5k |
| CORSAIR CAPITAL MANAGEMENT, L.P. 12.48% of their portfolio | 3.0m $65.1m | Reduced -46.6k |
| MILLENNIUM MANAGEMENT LLC 0.06% of their portfolio | 2.9m $62.0m | Added +314.3k |
| Invesco Ltd. 0.01% of their portfolio | 2.6m $56.3m | Added +2.3m |
| LORD, ABBETT & CO. LLC 0.17% of their portfolio | 2.5m $53.0m | Added +59.8k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.03% of their portfolio | 2.3m $49.1m | Reduced -508.3k |
| Bornite Capital Management LP 4.42% of their portfolio | 2.1m $44.2m | Reduced -12.6k |
| Select Equity Group, L.P. 0.19% of their portfolio | 2.0m $43.7m | Reduced -264.7k |
| Driehaus Capital Management LLC 0.35% of their portfolio | 2.0m $43.2m | New |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 2.0m $42.5m | Added +254.7k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 1.9m $41.6m | Reduced -38.3k |
| UBS Group AG 0.01% of their portfolio | 1.7m $36.7m | Added +207.5k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 1.7m $36.3m | Added +42.9k |
| ArrowMark Colorado Holdings LLC 0.65% of their portfolio | 1.7m $36.1m | Reduced -511.4k |
| LOOMIS SAYLES & CO L P 0.04% of their portfolio | 1.6m $34.3m | New |
| Nuveen, LLC 0.01% of their portfolio | 1.6m $33.4m | Added +162.3k |
| MORGAN STANLEY 0.00% of their portfolio | 1.5m $31.8m | Added +252.6k |
| Hood River Capital Management LLC 0.44% of their portfolio | 1.5m $31.7m | New |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 1.4m $29.8m | Added +794.6k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.20% of their portfolio | 1.4m $29.7m | Added +68.7k |
| ACK Asset Management LLC 3.78% of their portfolio | 1.3m $28.8m | Reduced -281.4k |
| Chescapmanager LLC 4.80% of their portfolio | 1.3m $28.6m | Unchanged |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.02% of their portfolio | 1.1m $24.1m | Reduced -2.1k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 1.1m $23.5m | Added +655.7k |
| SEGALL BRYANT & HAMILL, LLC 0.33% of their portfolio | 1.1m $23.5m | Added +377.9k |
| Rockefeller Capital Management L.P. 0.03% of their portfolio | 1.1m $23.4m | Added +149.5k |
| JENNISON ASSOCIATES LLC 0.01% of their portfolio | 1.1m $23.1m | Added +140.2k |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC 0.88% of their portfolio | 1.0m $22.5m | Added +150.0k |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 0.06% of their portfolio | 1.0m $21.7m | Reduced -725.5k |
| D. E. Shaw & Co., Inc. 0.02% of their portfolio | 967.5k $20.8m | Added +515.8k |
| EMERALD ADVISERS, LLC 0.76% of their portfolio | 965.2k $20.8m | Added +85.2k |
| VICTORY CAPITAL MANAGEMENT INC 0.01% of their portfolio | 958.7k $20.6m | Reduced -46.0k |
| SCHWARTZ INVESTMENT COUNSEL INC 0.68% of their portfolio | 954.3k $20.5m | Unchanged |
| FMR LLC 0.00% of their portfolio | 947.0k $20.4m | Added +625.2k |
| Pier Capital, LLC 2.86% of their portfolio | 871.0k $18.8m | Reduced -70.5k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 825.3k $17.8m | Added +537.9k |
| GROUPAMA ASSET MANAGMENT 0.02% of their portfolio | 800.0k $932.4k | New |
| ROYCE & ASSOCIATES LP 0.17% of their portfolio | 790.1k $17.0m | Added +121.5k |
| TCW GROUP INC 0.12% of their portfolio | 731.5k $15.7m | New |
| Bank of New York Mellon Corp 0.00% of their portfolio | 669.3k $14.4m | Added +163 |
| FRANKLIN RESOURCES INC 0.00% of their portfolio | 668.2k $14.4m | New |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 638.3k $13.7m | Added +58.6k |
| Ensign Peak Advisors, Inc 0.02% of their portfolio | 601.2k $12.9m | Added +105.1k |
| Troluce Capital Advisors LLC 6.58% of their portfolio | 600.0k $12.9m | New |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.02% of their portfolio | 563.8k $12.1m | Added +229.1k |
| GAMCO INVESTORS, INC. ET AL 0.12% of their portfolio | 562.1k $12.1m | Reduced -30.1k |
| FIL Ltd 0.01% of their portfolio | 560.9k $12.1m | Reduced -250.0k |
| Allspring Global Investments Holdings, LLC 0.02% of their portfolio | 556.4k $11.4m | Reduced -39.7k |
| Shannon River Fund Management LLC 1.84% of their portfolio | 555.4k $12.0m | New |
| EMERALD MUTUAL FUND ADVISERS TRUST 0.73% of their portfolio | 553.6k $11.9m | Added +46.5k |
| GABELLI FUNDS LLC 0.08% of their portfolio | 511.3k $11.0m | Reduced -12.9k |
| Telemark Asset Management, LLC 1.14% of their portfolio | 500.0k $10.8m | Unchanged |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 464.0k $10.0m | Reduced -186.2k |
| ARDSLEY ADVISORY PARTNERS LP 1.63% of their portfolio | 463.2k $10.0m | Added +288.2k |
| Nicholas Investment Partners, LP 0.88% of their portfolio | 459.9k $9.9m | Added +92.6k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 451.5k $9.7m | Reduced -457.8k |
| TD Asset Management Inc 0.01% of their portfolio | 430.8k $9.3m | Added +15.7k |
| KINGDON CAPITAL MANAGEMENT, L.L.C. 1.77% of their portfolio | 425.0k $9.2m | Reduced -25.0k |
| Concentric Capital Strategies, LP 0.50% of their portfolio | 412.5k $8.9m | New |
| BARCLAYS PLC 0.00% of their portfolio | 411.5k $8.9m | Added +158.0k |
| Swiss National Bank 0.01% of their portfolio | 408.8k $8.8m | Added +15.6k |
| MOORE CAPITAL MANAGEMENT, LP 0.18% of their portfolio | 407.4k $8.8m | New |
| AXIOM INVESTORS LLC /DE 0.07% of their portfolio | 392.7k $8.5m | New |
| ZACKS INVESTMENT MANAGEMENT 0.07% of their portfolio | 379.5k $8.2m | New |
| SEI INVESTMENTS CO 0.01% of their portfolio | 351.0k $7.6m | Added +157.3k |
| Aperture Investors, LLC 1.00% of their portfolio | 345.0k $7.4m | Reduced -12.4k |
| Verition Fund Management LLC 0.04% of their portfolio | 335.4k $7.2m | Added +134.0k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 318.6k $6.9m | Added +11.2k |
| SONA ASSET MANAGEMENT (US) LLC 0.23% of their portfolio | 314.0k $6.8m | New |
| AQR CAPITAL MANAGEMENT LLC 0.01% of their portfolio | 312.3k $6.7m | Added +113.0k |
| ESSEX INVESTMENT MANAGEMENT CO LLC 1.17% of their portfolio | 299.8k $6.5m | Reduced -2.1k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 299.7k $6.5m | Added +8.5k |
| Schonfeld Strategic Advisors LLC 0.05% of their portfolio | 278.4k $6.0m | Added +29.4k |
| RICE HALL JAMES & ASSOCIATES, LLC 0.31% of their portfolio | 269.8k $5.8m | Reduced -283 |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 264.9k $5.7m | Added +3.7k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 260.2k $5.6m | Added +148.6k |
| CITIGROUP INC 0.00% of their portfolio | 257.1k $5.5m | Added +91.2k |
| Hollow Brook Wealth Management LLC 1.61% of their portfolio | 255.9k $5.5m | Reduced -826 |
| Legal & General Group Plc 0.00% of their portfolio | 242.8k $5.2m | Added +9.1k |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 241.5k $5.2m | Reduced -86.6k |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.01% of their portfolio | 240.5k $5.2m | Added +216.4k |
| Sumitomo Mitsui DS Asset Management Company, Ltd 0.05% of their portfolio | 236.3k $5.1m | Added +148.6k |
| Global IMC LLC 1.32% of their portfolio | 236.2k $5.1m | New |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 233.0k $5.0m | Added +55.0k |
| Robeco Schweiz AG 0.11% of their portfolio | 230.0k $5.0m | New |