Mirion Technologies (MIR) CEO Logan discloses automatic tax share withholding

Rhea-AI Filing Summary

Mirion Technologies, Inc. CEO and director Thomas D. Logan reported an automatic share withholding related to equity compensation. On 12/27/2025, 39,863 shares of Class A common stock were withheld by the company at a price of $23.76 per share to satisfy tax obligations arising from the vesting of previously granted restricted stock units. After this tax withholding event, Logan directly beneficially owned 3,309,688 shares of Class A common stock and 1,544,017 shares of Class B common stock, and indirectly owned 111,566 shares of Class A common stock through the Logan Family Trust. The filing notes that the withholding followed a pre-adopted company policy and did not represent a discretionary trade by Logan.

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^*

Logan Thomas D

(Last) (First) (Middle)

1218 MENLO DRIVE

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive 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		39,863(1)	D	$23.76	3,309,688	D
Class B Common Stock								1,544,017	D
Class A Common Stock								111,566	I	Logan Family 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, attorney-in-fact for Thomas D. Logan	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 Thomas D. Logan?

The report shows that 39,863 shares of Class A common stock were withheld on 12/27/2025 to cover tax obligations from vested restricted stock units previously granted to Thomas D. Logan.

Was the Mirion Technologies (MIR) CEO’s share withholding a discretionary sale?

No. The filing states the shares were withheld by the issuer under a pre-adopted policy to satisfy tax withholding obligations and "does not represent a discretionary trade" by Thomas D. Logan.

How many Mirion Technologies (MIR) shares does Thomas D. Logan own after the reported transaction?

After the transaction, Thomas D. Logan beneficially owned 3,309,688 Class A shares and 1,544,017 Class B shares directly, plus 111,566 Class A shares indirectly through the Logan Family Trust.

What was the price used for the Mirion Technologies (MIR) share withholding?

The 39,863 withheld Class A shares were valued at $23.76 per share in connection with the tax withholding related to vested restricted stock units.

What is Thomas D. Logan’s role at Mirion Technologies (MIR)?

Thomas D. Logan is reported as both a director and an officer, serving as the company’s Chief Executive Officer.

How is the indirect ownership of Mirion Technologies (MIR) shares held for Thomas D. Logan?

The filing states that 111,566 Class A common shares are held indirectly through the Logan Family Trust.