Mirion (NYSE: MIR) CEO has 22,614 shares withheld to cover RSU taxes

Filing Impact

(High)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Mirion Technologies, Inc. Chief Executive Officer Thomas D. Logan reported a tax-related share withholding tied to vesting equity awards. On the vesting of previously granted restricted stock units, 22,614 shares of Class A Common Stock were withheld at $18.59 per share to satisfy tax withholding obligations under a pre-adopted company policy. This withholding is described as mandated by the issuer and not a discretionary trade by Logan.

After this event, Logan holds 364,060 shares of Class A Common Stock directly, 1,544,017 shares of Class B Common Stock directly, and 3,205,378 shares of Class A Common Stock indirectly through the Logan Family Trust.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Logan Thomas D

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Tax Withholding	Class A Common Stock	22,614	$18.59	$420K
holding	Class B Common Stock	--	--	--
holding	Class A Common Stock	--	--	--

Holdings After Transaction: Class A Common Stock — 364,060 shares (Direct); Class B Common Stock — 1,544,017 shares (Direct); Class A Common Stock — 3,205,378 shares (Indirect, Logan Family Trust)

Footnotes (1)

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Key Figures

Tax-withheld shares: 22,614 shares Withholding price per share: $18.59 per share Direct Class A holdings after event: 364,060 shares +2 more

5 metrics

Tax-withheld shares 22,614 shares Class A Common Stock withheld to satisfy tax obligations on RSU vesting

Withholding price per share $18.59 per share Price applied to 22,614 withheld Class A shares

Direct Class A holdings after event 364,060 shares Class A Common Stock held directly by Thomas D. Logan after withholding

Direct Class B holdings 1,544,017 shares Class B Common Stock held directly by Thomas D. Logan

Indirect Class A holdings via trust 3,205,378 shares Class A Common Stock held indirectly through the Logan Family Trust

Key Terms

restricted stock units (RSUs), tax withholding obligations, Logan Family Trust, tax-withholding disposition

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"

Logan Family Trust financial

"nature_of_ownership":"Logan Family Trust"

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.

Form 4 Insider Transactions: What Each Field Means →

04/02/2026 - 04:15 PM

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^*

Logan Thomas D

(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)

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	Chief Executive 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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A Common Stock	04/01/2026		F		22,614⁽¹⁾	D	$18.59	364,060	D
Class B Common Stock								1,544,017	D
Class A Common Stock								3,205,378	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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	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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Mirion (MIR) CEO Thomas D. Logan report?

Mirion CEO Thomas D. Logan reported a tax-withholding disposition of 22,614 Class A shares. These shares were withheld by the company to cover tax obligations arising from vesting restricted stock units, rather than sold in an open-market transaction or through a discretionary trade.

Was the Mirion (MIR) CEO’s Form 4 transaction a discretionary stock sale?

No, the Form 4 states the 22,614 Class A shares were withheld under a company policy to satisfy tax withholding on vesting RSUs. It explicitly notes this withholding was mandated by the issuer and does not represent a discretionary trade by Thomas D. Logan.

How many Mirion (MIR) Class A shares does the CEO hold after this filing?

After the reported tax-withholding event, Thomas D. Logan holds 364,060 shares of Class A Common Stock directly. He also has an indirect position of 3,205,378 Class A shares through the Logan Family Trust, as disclosed in the same Form 4 filing.

What are Thomas D. Logan’s indirect holdings in Mirion (MIR) stock?

The filing shows Thomas D. Logan indirectly holds 3,205,378 shares of Class A Common Stock through the Logan Family Trust. This indirect position is in addition to his directly held Class A and Class B shares disclosed in the Form 4 tables.

How many Mirion (MIR) Class B shares does the CEO own directly?

The Form 4 lists Thomas D. Logan with 1,544,017 shares of Class B Common Stock held directly. This entry is shown as a holding line, indicating the number of shares beneficially owned after the reported transactions on the same date.

What does the tax-withholding code on the Mirion (MIR) Form 4 mean?

The transaction uses code F, described as payment of tax liability by delivering securities. In this case, 22,614 shares were withheld to cover taxes on vesting restricted stock units, a common administrative mechanism rather than an open-market sale by the insider.