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Mirion Technologies, Inc. (MIR) institutional ownership

Latest close $16.56 Jul 9, 2026
Market cap$4.0B 52-week range SectorIndustrials
Funds holding · Q1 2026
372
reported MIR position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Net bought $38M
185 buyers · 187 sellers

Mirion Technologies, Inc. (MIR) price and institutional activity

Dates

Q1 2026

$717M bought by 185 investors
Millennium Management LLC$115MMaverick Capital Ltd$60M +183 more
$680M sold by 187 investors
Hood River Capital Management LLC-$63MDriehaus Capital Management LLC-$52M +185 more
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Bought Sold Totals per quarter; hover a bar for the names.

Mirion Technologies, Inc. (MIR) institutional activity · 372

Investor Type Est. change Change Δ Own Date
Millennium Management LLC · New +$115M
Change +5.1M Date Q1 2026
Millennium Management LLC New· Q1 2026 +$115M +5.1M Q1 2026
Hood River Capital Management LLC · Exited −$63M
Change −2.8M Δ Own −100.0% Date Q1 2026
Hood River Capital Management LLC Exited· Q1 2026 −$63M −2.8M −100.0% Q1 2026
Maverick Capital Ltd · New +$60M
Change +2.6M Date Q1 2026
Maverick Capital Ltd New· Q1 2026 +$60M +2.6M Q1 2026
Driehaus Capital Management LLC · Exited −$52M
Change −2.3M Δ Own −100.0% Date Q1 2026
Driehaus Capital Management LLC Exited· Q1 2026 −$52M −2.3M −100.0% Q1 2026
Goldman Sachs Group Inc · Added +$47M
Change +2.1M Date Q1 2026
Goldman Sachs Group Inc Added· Q1 2026 +$47M +2.1M Q1 2026
Massachusetts Financial Services Co · Reduced −$47M
Change −2.1M Date Q1 2026
Massachusetts Financial Services Co Reduced· Q1 2026 −$47M −2.1M Q1 2026
FMR LLC · Reduced −$42M
Change −1.9M Δ Own −22.1% Date Q1 2026
FMR LLC Reduced· Q1 2026 −$42M −1.9M −22.1% Q1 2026
Bank of New York Mellon Corp · Added +$33M
Change +1.5M Date Q1 2026
Bank of New York Mellon Corp Added· Q1 2026 +$33M +1.5M Q1 2026
Artemis Investment Management LLP · Reduced −$32M
Change −1.4M Date Q1 2026
Artemis Investment Management LLP Reduced· Q1 2026 −$32M −1.4M Q1 2026
Alliancebernstein L.P. · Added +$30M
Change +1.3M Date Q1 2026
Alliancebernstein L.P. Added· Q1 2026 +$30M +1.3M Q1 2026
Vaughan Nelson Investment Management, L.P. · Exited −$30M
Change −1.3M Δ Own −100.0% Date Q1 2026
Vaughan Nelson Investment Management, L.P. Exited· Q1 2026 −$30M −1.3M −100.0% Q1 2026
Lord, Abbett & Co. LLC · Reduced −$27M
Change −1.2M Date Q1 2026
Lord, Abbett & Co. LLC Reduced· Q1 2026 −$27M −1.2M Q1 2026
Daiwa Securities Group Inc. · Added +$26M
Change +1.2M Date Q1 2026
Daiwa Securities Group Inc. Added· Q1 2026 +$26M +1.2M Q1 2026
Alyeska Investment Group, L.P. · Added +$26M
Change +1.2M Date Q1 2026
Alyeska Investment Group, L.P. Added· Q1 2026 +$26M +1.2M Q1 2026
Congress Asset Management Co · New +$25M
Change +1.1M Date Q1 2026
Congress Asset Management Co New· Q1 2026 +$25M +1.1M Q1 2026
Data through Q1 2026 · filed Jun 3, 2026
15 of 372

Famous investor activity in Mirion Technologies, Inc. (MIR)

Mirion Technologies, Inc. (MIR) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Kingsley Lawrence D. · Director Grant (A) $19K
Price $17.46 Qty 1K Owned 73K ΔOwn +1.5% Trade date Jun 30, 2026 Filed date Jun 30, 2026
Kingsley Lawrence D. Director Grant (A) $17.46 1K $19K 73K +1.5% Jun 30, 2026 Jun 30, 2026
Kingsley Lawrence D. · Director Grant (A) 7K
Owned 71K Trade date May 13, 2026 Filed date May 14, 2026
Kingsley Lawrence D. Director Grant (A) 7K 71K May 13, 2026 May 14, 2026
Bockhorst Kenneth · Director Grant (A) 7K
Owned 77K Trade date May 13, 2026 Filed date May 14, 2026
Bockhorst Kenneth Director Grant (A) 7K 77K May 13, 2026 May 14, 2026
Cascella Robert · Director Grant (A) 7K
Owned 61K Trade date May 13, 2026 Filed date May 14, 2026
Cascella Robert Director Grant (A) 7K 61K May 13, 2026 May 14, 2026
Etzel Steven W. · Director Grant (A) 7K
Owned 87K Trade date May 13, 2026 Filed date May 14, 2026
Etzel Steven W. Director Grant (A) 7K 87K May 13, 2026 May 14, 2026
Kuo John W. · Director Grant (A) 7K
Owned 80K Trade date May 13, 2026 Filed date May 14, 2026
Kuo John W. Director Grant (A) 7K 80K May 13, 2026 May 14, 2026
Markopoulos Jody · Director Grant (A) 7K
Owned 82K Trade date May 13, 2026 Filed date May 14, 2026
Markopoulos Jody Director Grant (A) 7K 82K May 13, 2026 May 14, 2026
Rege Sheila · Director Grant (A) 7K
Owned 50K Trade date May 13, 2026 Filed date May 14, 2026
Rege Sheila Director Grant (A) 7K 50K May 13, 2026 May 14, 2026
Moore Christopher A. · Officer Sell −$165K
Price $19.64 Qty −8K Owned 22K Trade date May 7, 2026 Filed date May 8, 2026
Moore Christopher A. Officer Sell $19.64 −8K −$165K 22K May 7, 2026 May 8, 2026
Logan Thomas D. · Director Gift (G) -312K
Owned 52K Trade date May 6, 2026 Filed date May 7, 2026
Logan Thomas D. Director Gift (G) -312K 52K May 6, 2026 May 7, 2026
Ulrich Alison · Officer Tax withholding or exercise payment (F) -$38K
Price $18.59 Qty -2K Owned 36K Trade date Apr 1, 2026 Filed date Apr 2, 2026
Ulrich Alison Officer Tax withholding or exercise payment (F) $18.59 -2K -$38K 36K Apr 1, 2026 Apr 2, 2026
Schopfer Brian · CFO Tax withholding or exercise payment (F) -$137K
Price $18.59 Qty -7K Owned 913K Trade date Apr 1, 2026 Filed date Apr 2, 2026
Schopfer Brian CFO Tax withholding or exercise payment (F) $18.59 -7K -$137K 913K Apr 1, 2026 Apr 2, 2026
Moore Christopher A. · Officer Tax withholding or exercise payment (F) -$35K
Price $18.59 Qty -2K Owned 31K Trade date Apr 1, 2026 Filed date Apr 2, 2026
Moore Christopher A. Officer Tax withholding or exercise payment (F) $18.59 -2K -$35K 31K Apr 1, 2026 Apr 2, 2026
Logan Thomas D. · Director Tax withholding or exercise payment (F) -$420K
Price $18.59 Qty -23K Owned 364K Trade date Apr 1, 2026 Filed date Apr 2, 2026
Logan Thomas D. Director Tax withholding or exercise payment (F) $18.59 -23K -$420K 364K Apr 1, 2026 Apr 2, 2026
Lee Emmanuelle · Officer Tax withholding or exercise payment (F) -$87K
Price $18.59 Qty -5K Owned 82K Trade date Apr 1, 2026 Filed date Apr 2, 2026
Lee Emmanuelle Officer Tax withholding or exercise payment (F) $18.59 -5K -$87K 82K Apr 1, 2026 Apr 2, 2026
15 of 53
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Mirion Technologies, Inc. (MIR) activist and large shareholders

What are Schedules 13D and 13G?

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Gsam Holdings LLC 24.5M
% of shares outstanding 10.9% Filing date Apr 24, 2023
Gsam Holdings LLC 24.5M 10.9% Apr 24, 2023
Vanguard Group Inc 22.0M
% of shares outstanding 10.0% Filing date Aug 12, 2024
Vanguard Group Inc 22.0M 10.0% Aug 12, 2024
T. Rowe Price Investment Management, Inc. 20.2M
% of shares outstanding 8.9% Filing date Nov 14, 2024
T. Rowe Price Investment Management, Inc. 20.2M 8.9% Nov 14, 2024
Vanguard Portfolio Management 18.1M
% of shares outstanding 7.4% Filing date Apr 29, 2026
Vanguard Portfolio Management 18.1M 7.4% Apr 29, 2026
BlackRock Inc. 15.9M
% of shares outstanding 7.3% Filing date Jan 26, 2024
BlackRock Inc. 15.9M 7.3% Jan 26, 2024
Alyeska Investment Group, L.P.
% of shares outstanding 7.0% Filing date Feb 25, 2022
Alyeska Investment Group, L.P. 7.0% Feb 25, 2022
Goldman Sachs Group Inc 12.4M
% of shares outstanding 5.5% Filing date Nov 13, 2024
Goldman Sachs Group Inc 12.4M 5.5% Nov 13, 2024
Vanguard Capital Management 12.3M
% of shares outstanding 5.0% Filing date Apr 30, 2026
Vanguard Capital Management 12.3M 5.0% Apr 30, 2026
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Mirion Technologies, Inc. (MIR) ownership FAQ

Who owns MIR?

372 reporting institutions disclosed MIR position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.