Mirion Technologies (NYSE: MIR) discloses CLO RSU tax share withholding

Rhea-AI Filing Summary

Mirion Technologies, Inc. reported an insider equity transaction by its Chief Legal Officer, Emmanuelle Lee. On 12/27/2025, 5,913 shares of Class A common stock were withheld at a price of $23.76 per share to cover tax obligations arising from the vesting of previously granted restricted stock units. This withholding was mandated by company policy and is not a discretionary trade. Following this transaction, Lee beneficially owned 78,727 shares of Class A common stock directly and 138,193 shares of Class B common stock directly. An additional 32,748 shares of Class B common stock are held indirectly through the Lee Revocable Living Trust for the benefit of Lee, Lee’s spouse, and other beneficiaries, with Lee disclaiming ownership beyond her pecuniary interest.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Lee Emmanuelle

(Last) (First) (Middle)

1218 MENLO DR. NW

(Street)

ATLANTA GA 30318

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Mirion Technologies, Inc. [ MIR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Legal Officer

3. Date of Earliest Transaction (Month/Day/Year)
12/27/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	12/27/2025		F		5,913(1)	D	$23.76	78,727	D
Class B Common Stock								138,193	D
Class B Common Stock								32,748	I	By Trust(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 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.

2. Reflects shares of Class B Common Stock of the Issuer ("Class B Common Stock") held of record by the Lee Revocable Living Trust (the "Lee Trust") for the benefit of the Reporting Person, the Reporting Person's spouse, and beneficiaries. The Reporting Person and the Reporting Person's spouse are both trustees and beneficiary of the Lee Trust. The Reporting Person disclaims ownership of these shares of Class B Common Stock except to the extent of her pecuniary interest therein.

Remarks:

	/s/ Emmanuelle Lee	12/29/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did Mirion Technologies (MIR) report for Emmanuelle Lee?

Mirion Technologies reported that Chief Legal Officer Emmanuelle Lee had 5,913 shares of Class A common stock withheld on 12/27/2025 to satisfy tax withholding obligations related to vesting restricted stock units.

Was the Mirion Technologies (MIR) insider transaction a discretionary trade?

No. The company states that the 5,913 Class A shares were withheld under an issuer-mandated policy adopted in advance, and it does not represent a discretionary trade by Emmanuelle Lee.

How many Mirion Technologies (MIR) Class A shares does Emmanuelle Lee own after the transaction?

After the reported transaction, Emmanuelle Lee beneficially owned 78,727 shares of Class A common stock directly.

What are Emmanuelle Lee’s Class B share holdings in Mirion Technologies (MIR)?

Emmanuelle Lee beneficially owned 138,193 shares of Class B common stock directly and 32,748 shares of Class B common stock indirectly through the Lee Revocable Living Trust.

Why were Mirion Technologies (MIR) shares withheld from Emmanuelle Lee?

The 5,913 Class A shares were withheld by Mirion Technologies to satisfy tax withholding obligations arising from the vesting of restricted stock units previously granted to Emmanuelle Lee.

What price per share was used for the Mirion (MIR) tax withholding on Emmanuelle Lee’s RSUs?

The shares withheld to satisfy tax obligations were valued at $23.76 per Class A share for this transaction.