Mirion (MIR) CLO RSU vesting triggers 4,680-share tax withholding

Rhea-AI Filing Summary

Mirion Technologies Chief Legal Officer Emmanuelle Lee reported a mandatory tax-related share withholding tied to equity compensation. On Class A Common Stock, 4,680 shares were withheld at $18.59 per share to satisfy tax obligations from vesting restricted stock units under a pre-adopted company policy, rather than an open-market sale. After this event, Lee directly owned 82,431 Class A shares. The filing also shows holdings of Class B Common Stock, including 138,193 shares held directly and 32,748 shares held indirectly through a trust.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Lee Emmanuelle

Role Chief Legal Officer

Type	Security	Shares	Price	Value
Tax Withholding	Class A Common Stock	4,680	$18.59	$87K
holding	Class B Common Stock	--	--	--
holding	Class B Common Stock	--	--	--

Holdings After Transaction: Class A Common Stock — 82,431 shares (Direct); Class B Common Stock — 138,193 shares (Direct); Class B Common Stock — 32,748 shares (Indirect, By Trust)

Footnotes (1)

1. [object Object]

Key Figures

Tax-withheld shares: 4,680 shares Withholding price: $18.59 per share Class A holdings after: 82,431 shares +2 more

5 metrics

Tax-withheld shares 4,680 shares Class A shares withheld for RSU tax obligations

Withholding price $18.59 per share Price applied to 4,680 withheld Class A shares

Class A holdings after 82,431 shares Direct Class A Common Stock owned after withholding

Direct Class B holdings 138,193 shares Direct Class B Common Stock position

Indirect Class B holdings 32,748 shares Class B shares held indirectly via trust

Key Terms

restricted stock units (RSUs), tax withholding obligations, Class A Common Stock, Class B Common Stock

4 terms

restricted stock units (RSUs) financial

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

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 with the vesting"

Class A Common Stock financial

"security_title": "Class A Common Stock""

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

Class B Common Stock financial

"security_title": "Class B Common Stock""

A class B common stock is one of multiple types of a company’s ordinary shares that carries specific rights—often different voting power or dividend priority—compared with other classes. For investors it matters because those differences affect how much influence you have over company decisions, the income you might receive, and how freely the shares trade; think of it like owning a car with different keys: some keys let you start the engine and open the trunk, others only unlock the door.

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^*

Lee Emmanuelle

(Last) (First) (Middle)

1218 MENLO DR. NW

(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 Legal Officer

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		4,680(1)	D	$18.59	82,431	D
Class B Common Stock								138,193	D
Class B Common Stock								32,748	I	By Trust

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	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) disclose in this Form 4?

Mirion Technologies reported that Chief Legal Officer Emmanuelle Lee had 4,680 Class A shares withheld at $18.59 per share to cover tax obligations from vesting RSUs. This was a non-discretionary, issuer-mandated tax-withholding event, not an open-market sale or purchase of shares.

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

After the tax-withholding event, Emmanuelle Lee directly owned 82,431 shares of Mirion Technologies Class A Common Stock. This figure reflects her remaining direct Class A position following the 4,680 shares withheld by the company to satisfy RSU-related tax obligations.

Was the Mirion Technologies (MIR) Form 4 transaction a discretionary sale by the insider?

No. The filing states the 4,680 Class A shares were withheld by Mirion to satisfy tax withholding obligations from vesting RSUs under a pre-adopted policy. It explicitly notes this withholding was mandated by the issuer and does not represent a discretionary trade by Emmanuelle Lee.

What Class B Common Stock holdings of Mirion Technologies (MIR) does Emmanuelle Lee report?

The Form 4 shows Emmanuelle Lee holding 138,193 Mirion Class B Common Stock shares directly. It also reports 32,748 additional Class B shares held indirectly through a trust, indicating both direct and trust-based ownership positions in the company’s Class B equity.

How large was the Mirion Technologies (MIR) RSU-related tax withholding for Emmanuelle Lee?

The RSU-related tax withholding involved 4,680 Class A Common Stock shares at $18.59 per share. These shares were withheld by Mirion to cover tax obligations upon RSU vesting, rather than being sold into the market by the reporting person.