Mirion (MIR) CLO reports RSU grant and tax-withholding share disposition

Rhea-AI Filing Summary

Mirion Technologies Chief Legal Officer Emmanuelle Lee reported equity transactions involving Mirion Class A and Class B shares. On March 1, 2026, she received a grant of 11,568 shares of Class A Common Stock at $0 per share, described in a footnote as restricted stock units that vest in three equal annual installments starting on March 1, 2027, subject to continued employment.

On the same date, 3,184 Class A shares were disposed of at $21.61 per share to satisfy tax withholding obligations on previously granted RSUs under a pre‑adopted company policy, characterized as a non‑discretionary tax-withholding disposition. Following these transactions, Lee directly owned 87,111 Class A shares and 138,193 Class B shares. An additional 32,748 Class B shares are held by the Lee Revocable Living Trust for the benefit of Lee, her 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

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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)
03/01/2026

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	03/01/2026		A		11,568(1)	A	$0	90,295	D
Class A Common Stock	03/01/2026		F		3,184(2)	D	$21.61	87,111	D
Class B Common Stock								138,193	D
Class B Common Stock								32,748	I	By Trust(3)

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 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.

2. 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.

3. 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	03/03/2026
	** 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 transactions did Mirion Technologies (MIR) report for Emmanuelle Lee?

Mirion’s Chief Legal Officer Emmanuelle Lee reported an award of 11,568 Class A shares and a tax-withholding disposition of 3,184 Class A shares tied to RSU vesting, plus updated Class B holdings, including shares held through a family trust.

Was the Mirion (MIR) insider share disposition by Emmanuelle Lee an open-market sale?

No. The 3,184 Class A shares were withheld to cover tax obligations on vesting RSUs at $21.61 per share under a pre‑adopted company policy, described as a mandatory tax-withholding disposition rather than a discretionary open-market transaction.

How many Mirion (MIR) Class A shares does Emmanuelle Lee hold after the reported Form 4?

After the transactions, Emmanuelle Lee directly holds 87,111 shares of Mirion Class A Common Stock. This figure reflects the 11,568‑share award and the 3,184‑share tax-withholding disposition reported for March 1, 2026.

What are the vesting terms for Emmanuelle Lee’s new Mirion (MIR) restricted stock units?

The 11,568-share award represents restricted stock units that vest in three equal annual installments beginning March 1, 2027. Vesting requires Lee’s continued employment with Mirion through each scheduled vesting date for the RSUs to fully deliver.

How many Mirion (MIR) Class B shares are associated with Emmanuelle Lee and related entities?

The filing shows 138,193 Class B shares held directly by Emmanuelle Lee and 32,748 Class B shares held by the Lee Revocable Living Trust. She and her spouse are trustees, and she disclaims ownership beyond her pecuniary interest in those trust shares.

What role does the Lee Revocable Living Trust play in Mirion (MIR) share ownership?

The Lee Revocable Living Trust holds 32,748 Mirion Class B shares for the benefit of Emmanuelle Lee, her spouse, and beneficiaries. Lee and her spouse serve as trustees, and she disclaims ownership except to the extent of her pecuniary interest in these trust-held shares.