Insider Sale: Mirion CEO Disposes 500k Class A Shares, Retains 3.57M

Rhea-AI Filing Summary

Thomas D. Logan, who is listed as both Chief Executive Officer and a Director of Mirion Technologies, Inc. (MIR), reported open‑market sales of the company's common stock in a Form 4 filing.

The filing shows Mr. Logan sold 325,000 shares of Class A common stock on 08/11/2025 at a weighted average price of $21.3143 (individual sale prices ranged $21.01–$21.47) and sold 175,000 shares of Class A common stock on 08/12/2025 at a weighted average price of $21.7922 (individual sale prices ranged $21.31–$22.205). After these reported transactions his beneficial ownership of Class A common stock is shown as 3,567,305 shares and his Class B common stock beneficial ownership is shown as 1,544,017 shares.

The Form 4 is signed by an attorney‑in‑fact, Emmanuelle Lee, on behalf of Thomas D. Logan on 08/13/2025. The filing provides the sale dates, amounts and weighted average prices but does not state any reason or plan under which the sales occurred.

Positive

• Continued significant ownership: Reporting person retains 3,567,305 Class A shares and 1,544,017 Class B shares after the sales
• Transparent regulatory disclosure: Sales reported promptly via Form 4 with dates and weighted average prices

Negative

• Insider dispositions: Reporting person sold a total of 500,000 Class A shares (325,000 on 08/11/2025 and 175,000 on 08/12/2025)
• No plan disclosed: The filing does not state that the sales were made pursuant to a Rule 10b5‑1 trading plan or provide explanatory context

Insights

Securities Analyst

TL;DR: CEO Logan executed routine open‑market sales totaling 500,000 Class A shares across two days; holdings remain multi‑million shares.

The transactions reported are explicit: 325,000 shares sold on 08/11/2025 at a weighted average of $21.3143 and 175,000 sold on 08/12/2025 at a weighted average of $21.7922, totaling 500,000 shares sold. Post‑sale holdings remain substantial at 3,567,305 Class A shares plus 1,544,017 Class B shares. From a market‑impact perspective, these are material in absolute share count but the filing does not provide context such as a prearranged trading plan, hedging activity, or insider liquidity needs. Without that context, this disclosure is a straightforward reporting of insider dispositions, not an indication of company financial performance.

Corporate Governance Expert

TL;DR: The Form 4 documents notable insider sales by the CEO but contains no explanation or 10b5‑1 plan disclosure; governance watchers will note the change in insiders' liquid position.

The filing confirms the signature by an attorney‑in‑fact and presents the sale dates, share counts and weighted average prices. Good governance practice encourages disclosure of whether sales are preplanned; this Form 4 does not identify a Rule 10b5‑1 plan or other affirmative defense. The continuing large beneficial ownership (over 3.5 million Class A and 1.54 million Class B shares) remains relevant for control and alignment assessments, but the filing alone does not reveal intent or timing rationale.

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 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)
08/11/2025

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	08/11/2025		S		325,000	D	$21.3143(1)	3,742,305	D
Class A Common Stock	08/12/2025		S		175,000	D	$21.7922(2)	3,567,305	D
Class B Common Stock								1,544,017	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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.01 to $21.47, inclusive.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.31 to $22.205, inclusive.

Remarks:

	/s/ Emmanuelle Lee, attorney-in-fact for Thomas D. Logan	08/13/2025
	** 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 shares did Mirion (MIR) insider Thomas D. Logan sell?

The Form 4 reports sales of Class A common stock: 325,000 shares on 08/11/2025 and 175,000 shares on 08/12/2025.

At what prices were the MIR shares sold by the CEO?

The filing lists weighted average prices of $21.3143 for the 08/11/2025 sales (range $21.01–$21.47) and $21.7922 for the 08/12/2025 sales (range $21.31–$22.205).

How many MIR shares does Thomas D. Logan own after these transactions?

After the reported transactions the Form 4 shows beneficial ownership of 3,567,305 Class A shares and 1,544,017 Class B shares.

Was the sale reported under a 10b5‑1 trading plan?

The Form 4 content provided does not indicate that the transactions were made pursuant to a Rule 10b5‑1 plan.

Who signed the Form 4 for Thomas D. Logan and when?

The Form 4 is signed by Emmanuelle Lee, attorney‑in‑fact, for Thomas D. Logan on 08/13/2025.