Mirion Technologies (MIR) CAO has 1,903 shares withheld to cover RSU taxes

Rhea-AI Filing Summary

Mirion Technologies, Inc. Chief Accounting Officer Christopher A. Moore reported a routine share disposition tied to equity compensation. On April 1, 2026, 1,903 shares of Class A common stock were withheld at $18.59 per share to satisfy tax withholding obligations from vesting restricted stock units.

The company’s policy required this withholding, so it was not a discretionary market trade. After this tax-related disposition, Moore directly held 30,557 shares of Mirion Technologies Class A common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Moore Christopher A.

Role Chief Accounting Officer (PAO)

Type	Security	Shares	Price	Value
Tax Withholding	Class A Common Stock	1,903	$18.59	$35K

Holdings After Transaction: Class A Common Stock — 30,557 shares (Direct)

Footnotes (1)

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Key Figures

Shares withheld for taxes: 1,903 shares Withholding price: $18.59 per share Shares held after transaction: 30,557 shares

3 metrics

Shares withheld for taxes 1,903 shares Tax withholding on RSU vesting, April 1, 2026

Withholding price $18.59 per share Value used for tax-withholding disposition

Shares held after transaction 30,557 shares Direct Class A common stock holdings following withholding

Key Terms

restricted stock units (RSUs), tax withholding obligations, tax-withholding disposition, Chief Accounting Officer (PAO)

4 terms

restricted stock units (RSUs) financial

"in connection with the vesting of restricted stock units (RSUs) previously granted"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

tax withholding obligations financial

"withheld by the Issuer in satisfaction of tax withholding obligations in connection"

tax-withholding disposition financial

"transaction_action": "tax-withholding disposition""

A tax-withholding disposition is an event or transaction—such as selling or transferring securities, exercising options, or receiving compensation—that triggers a requirement to hold back part of the payment and remit it to tax authorities. It matters to investors because it reduces the cash they receive immediately and can change the timing and amount of taxable income, like a cashier taking a portion of your sale proceeds to pay taxes before you get the rest.

Chief Accounting Officer (PAO) financial

"officer_title": "Chief Accounting Officer (PAO)""

Form 4 Insider Transactions: What Each Field Means →

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Moore Christopher A.

(Last) (First) (Middle)

1218 MENLO DRIVE

(Street)

ATLANTA GEORGIA 30318

(City) (State) (Zip)

UNITED STATES

(Country)

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 Accounting Officer (PAO)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/01/2026

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

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

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

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	04/01/2026		F		1,903(1)	D	$18.59	30,557	D

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.

Remarks:

	/s/ Emmanuelle Lee, attorney-in-fact for Christopher Moore	04/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Mirion Technologies (MIR) report for Christopher A. Moore?

Mirion Technologies reported that Chief Accounting Officer Christopher A. Moore had 1,903 Class A common shares withheld to cover tax obligations from vesting RSUs. This was an automatic, policy-mandated transaction rather than a discretionary market trade or open-market sale of stock.

Was the Mirion Technologies (MIR) insider transaction an open-market sale of shares?

No, the transaction was not an open-market sale. Shares were withheld by Mirion Technologies to satisfy tax withholding obligations on vesting restricted stock units, under a pre-adopted company policy. It represents a tax payment mechanism, not a voluntary decision to sell shares in the market.

How many Mirion Technologies (MIR) shares were withheld for taxes in this Form 4?

A total of 1,903 shares of Mirion Technologies Class A common stock were withheld to cover tax withholding obligations. The withholding price was $18.59 per share and was associated with the vesting of previously granted restricted stock units to the reporting officer.

How many Mirion Technologies (MIR) shares does Christopher A. Moore hold after this transaction?

Following the tax-withholding transaction, Christopher A. Moore directly holds 30,557 shares of Mirion Technologies Class A common stock. This figure reflects his remaining equity position after 1,903 shares were withheld to satisfy tax obligations on vesting restricted stock units.

What does transaction code F mean in the Mirion Technologies (MIR) Form 4 filing?

Transaction code F indicates a disposition of shares to pay an exercise price or tax liability. In this Mirion Technologies filing, it reflects shares withheld by the issuer to satisfy tax withholding obligations on vesting restricted stock units, not an elective buy or sell in the open market.