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NYSE · USD

MIR

Mirion Technologies, Inc.

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Tapewire entity
394
SEC CIK
0001809987
Parsed reports
250

Last 12 months

Inside the activity.

1 purchase rows · 7 sale rows

Disclosed non-derivative P/S rows, by transaction month. Includes amendments and private transactions.
Monthly counts
MonthPurchasesSales
Nov 202505
Dec 202501
Jan 202600
Feb 202600
Mar 202600
Apr 202600
May 202601
Jun 202600
Jul 202600
Aug 202600
Sep 202610
Oct 202600

Latest available

Insider transactions

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateOwner / reported roleActivity / securityShares / unitsReported priceReported valueDetails
September 30, 2026 Filed Sep 30, 2026 20:16 UTC GrantClass A Common Stock 1,333 $14.34 $19,115.22
Disclosure

SEC source: 0001628280-26-063985 · wk-form4_1790799395.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,858

F1 · shares: These shares were issued in connection with the Reporting Person's election to receive his or her quarterly retainer for director services in the form of vested shares rather than cash.

Read SEC document
September 30, 2026 Filed Sep 30, 2026 20:15 UTC GrantClass A Common Stock 1,333 $14.34 $19,115.22
Disclosure

SEC source: 0001628280-26-063983 · wk-form4_1790799345.xml · nonDerivative · entry 1

Markopoulos Jody · CIK 0001854410 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,842

F1 · shares: These shares were issued in connection with the Reporting Person's election to receive his or her quarterly retainer for director services in the form of vested shares rather than cash.

Read SEC document
September 02, 2026 Filed Sep 2, 2026 20:10 UTC
Schopfer BrianChief Financial Officer
PurchaseClass A Common Stock 20,000 $15.60 $312,000.00
Disclosure

SEC source: 0001628280-26-060095 · wk-form4_1788379842.xml · nonDerivative · entry 1

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 933,290

Read SEC document
June 30, 2026 Filed Jun 30, 2026 20:24 UTC GrantClass A Common Stock 1,095 $17.46 $19,118.70
Disclosure

SEC source: 0001628280-26-046239 · wk-form4_1782851089.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,525

F1 · shares: These shares were issued in connection with the Reporting Person's election to receive his or her quarterly retainer for director services in the form of vested shares rather than cash.

Read SEC document
May 13, 2026 Filed May 14, 2026 20:08 UTC GrantClass A Common Stock 7,383 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-035097 · wk-form4_1778789306.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,430

F1 · shares: Represents restricted stock units that will vest on the earlier to occur of (i) first anniversary of the grant date or (ii) date of the annual stockholder meeting following the grant date, subject to the non-employee director's continued service on the Board through such vesting date.

Read SEC document
May 13, 2026 Filed May 14, 2026 20:08 UTC GrantClass A Common Stock 7,383 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-035096 · wk-form4_1778789289.xml · nonDerivative · entry 1

Bockhorst Kenneth · CIK 0001672279 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,258

F1 · shares: Represents restricted stock units that will vest on the earlier to occur of (i) first anniversary of the grant date or (ii) date of the annual stockholder meeting following the grant date, subject to the non-employee director's continued service on the Board through such vesting date.

Read SEC document
May 13, 2026 Filed May 14, 2026 20:07 UTC GrantClass A Common Stock 7,383 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-035094 · wk-form4_1778789273.xml · nonDerivative · entry 1

CASCELLA ROBERT · CIK 0001218713 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,801

F1 · shares: Represents restricted stock units that will vest on the earlier to occur of (i) first anniversary of the grant date or (ii) date of the annual stockholder meeting following the grant date, subject to the non-employee director's continued service on the Board through such vesting date.

Read SEC document
May 13, 2026 Filed May 14, 2026 20:07 UTC GrantClass A Common Stock 7,383 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-035092 · wk-form4_1778789249.xml · nonDerivative · entry 1

Etzel Steven W. · CIK 0001417866 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 87,448

F1 · shares: Represents restricted stock units that will vest on the earlier to occur of (i) first anniversary of the grant date or (ii) date of the annual stockholder meeting following the grant date, subject to the non-employee director's continued service on the Board through such vesting date.

Read SEC document
May 13, 2026 Filed May 14, 2026 20:07 UTC
KUO JOHN WDirector
GrantClass A Common Stock 7,383 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-035090 · wk-form4_1778789236.xml · nonDerivative · entry 1

KUO JOHN W · CIK 0001330270 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 80,119

F1 · shares: Represents restricted stock units that will vest on the earlier to occur of (i) first anniversary of the grant date or (ii) date of the annual stockholder meeting following the grant date, subject to the non-employee director's continued service on the Board through such vesting date.

Read SEC document
May 13, 2026 Filed May 14, 2026 20:07 UTC GrantClass A Common Stock 7,383 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-035088 · wk-form4_1778789218.xml · nonDerivative · entry 1

Markopoulos Jody · CIK 0001854410 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81,509

F1 · shares: Represents restricted stock units that will vest on the earlier to occur of (i) first anniversary of the grant date or (ii) date of the annual stockholder meeting following the grant date, subject to the non-employee director's continued service on the Board through such vesting date.

Read SEC document
May 13, 2026 Filed May 14, 2026 20:06 UTC
Rege SheilaDirector
GrantClass A Common Stock 7,383 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-035086 · wk-form4_1778789205.xml · nonDerivative · entry 1

Rege Sheila · CIK 0001947177 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,877

F1 · shares: Represents restricted stock units that will vest on the earlier to occur of (i) first anniversary of the grant date or (ii) date of the annual stockholder meeting following the grant date, subject to the non-employee director's continued service on the Board through such vesting date.

Read SEC document
May 07, 2026 Filed May 8, 2026 20:08 UTC
Moore Christopher A.Chief Accounting Officer (PAO)
SaleClass A Common Stock 8,400 $19.64 $164,976.00
Disclosure

SEC source: 0001628280-26-032863 · wk-form4_1778270935.xml · nonDerivative · entry 1

Moore Christopher A. · CIK 0001928030 · Chief Accounting Officer (PAO)

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,157

Read SEC document
May 06, 2026 Filed May 7, 2026 20:22 UTC
Logan Thomas DDirector · Chief Executive Officer
GiftClass A Common Stock 311,851 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-032198 · wk-form4_1778185340.xml · nonDerivative · entry 1

Logan Thomas D · CIK 0001486259 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,209

F1 · shares: On May 6, 2026, the Reporting Person made a gift of 311,851 shares of Class A Common Stock to the Logan Family Trust. The Reporting Person received no consideration for this gift.

Read SEC document
April 01, 2026 Filed Apr 2, 2026 20:17 UTC
Ulrich AlisonChief Human Resources Officer
Tax withholdingClass A Common Stock 2,053 $18.59 $38,165.27
Disclosure

SEC source: 0001628280-26-023183 · wk-form4_1775161051.xml · nonDerivative · entry 1

Ulrich Alison · CIK 0002013994 · Chief Human Resources Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,235

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
April 01, 2026 Filed Apr 2, 2026 20:16 UTC
Schopfer BrianChief Financial Officer
Tax withholdingClass A Common Stock 7,377 $18.59 $137,138.43
Disclosure

SEC source: 0001628280-26-023177 · wk-form4_1775161007.xml · nonDerivative · entry 1

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 913,290

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
April 01, 2026 Filed Apr 2, 2026 20:16 UTC
Moore Christopher A.Chief Accounting Officer (PAO)
Tax withholdingClass A Common Stock 1,903 $18.59 $35,376.77
Disclosure

SEC source: 0001628280-26-023173 · wk-form4_1775160966.xml · nonDerivative · entry 1

Moore Christopher A. · CIK 0001928030 · Chief Accounting Officer (PAO)

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,557

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
April 01, 2026 Filed Apr 2, 2026 20:15 UTC
Logan Thomas DDirector · Chief Executive Officer
Tax withholdingClass A Common Stock 22,614 $18.59 $420,394.26
Disclosure

SEC source: 0001628280-26-023169 · wk-form4_1775160924.xml · nonDerivative · entry 1

Logan Thomas D · CIK 0001486259 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 364,060

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
April 01, 2026 Filed Apr 2, 2026 20:14 UTC
Lee EmmanuelleChief Legal Officer
Tax withholdingClass A Common Stock 4,680 $18.59 $87,001.20
Disclosure

SEC source: 0001628280-26-023163 · wk-form4_1775160862.xml · nonDerivative · entry 1

Lee Emmanuelle · CIK 0002014061 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,431

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
March 31, 2026 Filed Apr 2, 2026 20:13 UTC GrantClass A Common Stock 1,104 $17.32 $19,121.28
Disclosure

SEC source: 0001628280-26-023160 · wk-form4_1775160831.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 64,047

F1 · shares: These shares were issued in connection with the Reporting Person's election to receive his or her quarterly retainer for director services in the form of vested shares rather than cash.

Read SEC document
March 02, 2026 Filed Mar 3, 2026 21:13 UTC
Eloy LoicNuclear & Safety President
GrantClass A Common Stock 15,577 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-013819 · wk-form4_1772572403.xml · nonDerivative · entry 1

Eloy Loic · CIK 0001912434 · Nuclear & Safety President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 113,347

F1 · shares: Represents the settlement of certain performance-based restricted stock units ("PSU") previously granted on December 31, 2023, based on the achievement of specified performance goals as determined by the Issuer's compensation committee of its board of directors.

Read SEC document
March 02, 2026 Filed Mar 3, 2026 21:13 UTC
Schopfer BrianChief Financial Officer
Tax withholdingClass A Common Stock 28,499 $21.61 $615,863.39
Disclosure

SEC source: 0001628280-26-013818 · wk-form4_1772572389.xml · nonDerivative · entry 3

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 920,667

F3 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of the PSUs previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
March 02, 2026 Filed Mar 3, 2026 21:13 UTC
Schopfer BrianChief Financial Officer
GrantClass A Common Stock 64,906 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-013818 · wk-form4_1772572389.xml · nonDerivative · entry 2

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 949,166

F2 · shares: Represents the settlement of certain performance-based restricted stock units ("PSU") previously granted on December 31, 2023, based on the achievement of specified performance goals as determined by the Issuer's compensation committee of its board of directors.

Read SEC document
March 02, 2026 Filed Mar 3, 2026 21:12 UTC
Logan Thomas DDirector · Chief Executive Officer
GiftClass A Common Stock 3,093,812 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-013814 · wk-form4_1772572313.xml · nonDerivative · entry 4

Logan Thomas D · CIK 0001486259 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 386,674

F4 · shares: On March 2, 2026, the Reporting Person made a gift of 3,093,812 shares of Class A Common Stock to the Logan Family Trust. The Reporting Person received no consideration for the gift.

Read SEC document
March 02, 2026 Filed Mar 3, 2026 21:12 UTC
Logan Thomas DDirector · Chief Executive Officer
Tax withholdingClass A Common Stock 127,184 $21.61 $2,748,446.24
Disclosure

SEC source: 0001628280-26-013814 · wk-form4_1772572313.xml · nonDerivative · entry 3

Logan Thomas D · CIK 0001486259 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,480,486

F3 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of the PSUs previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
March 02, 2026 Filed Mar 3, 2026 21:12 UTC
Logan Thomas DDirector · Chief Executive Officer
GrantClass A Common Stock 318,632 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-013814 · wk-form4_1772572313.xml · nonDerivative · entry 2

Logan Thomas D · CIK 0001486259 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,607,670

F2 · shares: Represents the settlement of certain performance-based restricted stock units ("PSU") previously granted on December 31, 2023, based on the achievement of specified performance goals as determined by the Issuer's compensation committee of its board of directors.

Read SEC document
March 01, 2026 Filed Mar 3, 2026 21:13 UTC
Schopfer BrianChief Financial Officer
Tax withholdingClass A Common Stock 9,172 $21.61 $198,206.92
Disclosure

SEC source: 0001628280-26-013818 · wk-form4_1772572389.xml · nonDerivative · entry 1

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 884,260

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
March 01, 2026 Filed Mar 3, 2026 21:12 UTC
Ulrich AlisonChief Human Resources Officer
Tax withholdingClass A Common Stock 2,360 $21.61 $50,999.60
Disclosure

SEC source: 0001628280-26-013817 · wk-form4_1772572368.xml · nonDerivative · entry 2

Ulrich Alison · CIK 0002013994 · Chief Human Resources Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,288

F2 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
March 01, 2026 Filed Mar 3, 2026 21:12 UTC
Ulrich AlisonChief Human Resources Officer
GrantClass A Common Stock 5,552 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-013817 · wk-form4_1772572368.xml · nonDerivative · entry 1

Ulrich Alison · CIK 0002013994 · Chief Human Resources Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,648

F1 · shares: Represents restricted stock units that will vest in three equal annual installments starting on March 1, 2027, subject to the Reporting Person's continued employment through each vesting date.

Read SEC document
March 01, 2026 Filed Mar 3, 2026 21:12 UTC
Moore Christopher A.Chief Accounting Officer (PAO)
Tax withholdingClass A Common Stock 1,397 $21.61 $30,189.17
Disclosure

SEC source: 0001628280-26-013816 · wk-form4_1772572351.xml · nonDerivative · entry 2

Moore Christopher A. · CIK 0001928030 · Chief Accounting Officer (PAO)

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,460

F2 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
March 01, 2026 Filed Mar 3, 2026 21:12 UTC
Moore Christopher A.Chief Accounting Officer (PAO)
GrantClass A Common Stock 5,552 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-013816 · wk-form4_1772572351.xml · nonDerivative · entry 1

Moore Christopher A. · CIK 0001928030 · Chief Accounting Officer (PAO)

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,857

F1 · shares: Represents restricted stock units that will vest in three equal annual installments starting on March 1, 2027, subject to the Reporting Person's continued employment through each vesting date.

Read SEC document
March 01, 2026 Filed Mar 3, 2026 21:12 UTC
Lee EmmanuelleChief Legal Officer
Tax withholdingClass A Common Stock 3,184 $21.61 $68,806.24
Disclosure

SEC source: 0001628280-26-013815 · wk-form4_1772572337.xml · nonDerivative · entry 2

Lee Emmanuelle · CIK 0002014061 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 87,111

F2 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
March 01, 2026 Filed Mar 3, 2026 21:12 UTC
Lee EmmanuelleChief Legal Officer
GrantClass A Common Stock 11,568 $0.00 $0.00
Disclosure

SEC source: 0001628280-26-013815 · wk-form4_1772572337.xml · nonDerivative · entry 1

Lee Emmanuelle · CIK 0002014061 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,295

F1 · shares: Represents restricted stock units that will vest in three equal annual installments starting on March 1, 2027, subject to the Reporting Person's continued employment through each vesting date.

Read SEC document
March 01, 2026 Filed Mar 3, 2026 21:12 UTC
Logan Thomas DDirector · Chief Executive Officer
Tax withholdingClass A Common Stock 20,650 $21.61 $446,246.50
Disclosure

SEC source: 0001628280-26-013814 · wk-form4_1772572313.xml · nonDerivative · entry 1

Logan Thomas D · CIK 0001486259 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,289,038

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
December 31, 2025 Filed Jan 5, 2026 21:04 UTC GrantClass A Common Stock 806 $23.70 $19,102.20
Disclosure

SEC source: 0001628280-26-000405 · wk-form4_1767647061.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,943

F1 · shares: These shares were issued in connection with the Reporting Person's election to receive his or her quarterly retainer for director services in the form of vested shares rather than cash.

Read SEC document
December 27, 2025 Filed Dec 29, 2025 21:08 UTC
Logan Thomas DDirector · Chief Executive Officer
Tax withholdingClass A Common Stock 39,863 $23.76 $947,144.88
Disclosure

SEC source: 0001628280-25-058982 · wk-form4_1767042522.xml · nonDerivative · entry 1

Logan Thomas D · CIK 0001486259 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,309,688

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
December 27, 2025 Filed Dec 29, 2025 21:08 UTC
Schopfer BrianChief Financial Officer
Tax withholdingClass A Common Stock 8,500 $23.76 $201,960.00
Disclosure

SEC source: 0001628280-25-058980 · wk-form4_1767042492.xml · nonDerivative · entry 1

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 893,432

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
December 27, 2025 Filed Dec 29, 2025 21:07 UTC
Lee EmmanuelleChief Legal Officer
Tax withholdingClass A Common Stock 5,913 $23.76 $140,492.88
Disclosure

SEC source: 0001628280-25-058977 · wk-form4_1767042464.xml · nonDerivative · entry 1

Lee Emmanuelle · CIK 0002014061 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 78,727

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
December 27, 2025 Filed Dec 29, 2025 21:07 UTC
Ulrich AlisonChief Human Resources Officer
Tax withholdingClass A Common Stock 134 $23.76 $3,183.84
Disclosure

SEC source: 0001628280-25-058973 · wk-form4_1767042435.xml · nonDerivative · entry 1

Ulrich Alison · CIK 0002013994 · Chief Human Resources Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,096

F1 · shares: Represents shares that have been withheld by the Issuer in satisfaction of tax withholding obligations in connection with the vesting of restricted stock units (RSUs) previously granted to the Reporting Person. Such withholding was mandated by the Issuer by a policy adopted in advance and does not represent a discretionary trade by the Reporting Person.

Read SEC document
December 11, 2025 Filed Dec 12, 2025 21:06 UTC
KUO JOHN WDirector
GiftClass A Common Stock 4,860 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-056760 · wk-form4_1765573613.xml · nonDerivative · entry 1

KUO JOHN W · CIK 0001330270 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,736

F1 · shares: On December 11, 2025, the Reporting Person made a gift of 4,860 shares of Class A Common Stock to a donor advised fund. The Reporting Person received no consideration for the gift.

Read SEC document
December 10, 2025 Filed Dec 12, 2025 21:05 UTC SaleClass A Common Stock 350,000 $24.73 $8,654,800.00
Disclosure

SEC source: 0001628280-25-056753 · wk-form4_1765573552.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Lawrence D. Kingsley Revocable Trust

Disclosed balance after: 3,509,075

Read SEC document
December 08, 2025 Filed Dec 9, 2025 21:05 UTC
Schopfer BrianChief Financial Officer
GiftClass A Common Stock 100 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-056062 · wk-form4_1765314332.xml · nonDerivative · entry 2

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 901,932

F1 · shares: On December 5, 2025 and December 8, 2025, the Reporting Person made a gift of 2,500 shares of Class A Common Stock to a University. The Reporting Person received no consideration for the gift.

Read SEC document
December 08, 2025 Filed Dec 12, 2025 21:07 UTC GiftClass A Common Stock 9,680 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-056763 · wk-form4_1765573650.xml · nonDerivative · entry 1

Bockhorst Kenneth · CIK 0001672279 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 69,875

F1 · shares: On December 8, 2025, the Reporting Person made a gift of 9,680 shares of Class A Common Stock to a donor advised fund. The Reporting Person received no consideration for the gift.

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December 05, 2025 Filed Dec 9, 2025 21:05 UTC
Schopfer BrianChief Financial Officer
GiftClass A Common Stock 2,400 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-056062 · wk-form4_1765314332.xml · nonDerivative · entry 1

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 902,032

F1 · shares: On December 5, 2025 and December 8, 2025, the Reporting Person made a gift of 2,500 shares of Class A Common Stock to a University. The Reporting Person received no consideration for the gift.

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November 24, 2025 Filed Nov 25, 2025 21:05 UTC GiftClass A Common Stock 40,925 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-053976 · wk-form4_1764104741.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Lawrence D. Kingsley Revocable Trust

Disclosed balance after: 3,859,075

F1 · shares: On November 24, 2025, the Reporting Person made a gift of 40,925 shares of Class A Common Stock to a donor advised fund. The Reporting Person received no consideration for the gift.

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November 21, 2025 Filed Nov 21, 2025 21:06 UTC SaleClass A Common Stock 300,000 $23.83 $7,148,400.00
Disclosure

SEC source: 0001628280-25-053585 · wk-form4_1763759203.xml · nonDerivative · entry 1

Kingsley Lawrence D · CIK 0001301427 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Lawrence D. Kingsley Revocable Trust

Disclosed balance after: 3,900,000

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November 11, 2025 Filed Nov 12, 2025 21:18 UTC
Eloy LoicNuclear & Safety President
SaleClass A Common Stock 45,000 $27.24 $1,225,683.00
Disclosure

SEC source: 0001628280-25-051618 · wk-form4_1762982331.xml · nonDerivative · entry 1

Eloy Loic · CIK 0001912434 · Nuclear & Safety President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 97,770

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November 10, 2025 Filed Nov 12, 2025 21:18 UTC
Lee EmmanuelleChief Legal Officer
SaleClass A Common Stock 12,500 $27.41 $342,642.50
Disclosure

SEC source: 0001628280-25-051617 · wk-form4_1762982312.xml · nonDerivative · entry 1

Lee Emmanuelle · CIK 0002014061 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 84,640

F1 · price: The sales reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 11, 2025.

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November 06, 2025 Filed Nov 10, 2025 21:15 UTC
Schopfer BrianChief Financial Officer
SaleClass A Common Stock 50,000 $27.66 $1,382,800.00
Disclosure

SEC source: 0001628280-25-051057 · wk-form4_1762809322.xml · nonDerivative · entry 4

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 904,432

F2 · price: The sales reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 7, 2025.

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November 06, 2025 Filed Nov 10, 2025 21:15 UTC
Schopfer BrianChief Financial Officer
SaleClass A Common Stock 50,000 $27.65 $1,382,620.00
Disclosure

SEC source: 0001628280-25-051057 · wk-form4_1762809322.xml · nonDerivative · entry 3

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 954,432

F2 · price: The sales reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 7, 2025.

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November 06, 2025 Filed Nov 10, 2025 21:15 UTC
Schopfer BrianChief Financial Officer
Disposition to issuerClass B Common Stock 100,000 Not disclosed Not disclosed
Disclosure

SEC source: 0001628280-25-051057 · wk-form4_1762809322.xml · nonDerivative · entry 2

Schopfer Brian · CIK 0001885701 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 399,935

F1 · price: The Issuer issued 100,000 shares of Class A common stock of the Issuer to the reporting person pursuant to a redemption of 100,000 shares of Class B common stock of Mirion IntermediateCo, Inc. held by the reporting person effectuated pursuant to a 10b5-1 plan adopted by the reporting person on August 7, 2025. In connection with such redemption the Issuer cancelled 100,000 shares of Class B common stock of the Issuer held by the reporting person.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.