Second 75k-Share Insider Sale Filed by Mirion Technologies

Rhea-AI Filing Summary

Mirion Technologies, Inc. (MIR) has filed a Form 144 with the SEC, indicating a planned insider sale under Rule 144.

The notice covers a proposed disposition of 75,000 Class A common shares through UBS Financial Services on or about 26 June 2025 (issuer table lists 06/25/2025) on the NYSE. The filing assigns an aggregate market value of $1.575 million to the shares, versus a public float of 225,554,626 shares, representing roughly 0.03% of shares outstanding.

The form also discloses prior activity within the last three months: Brian Schopfer sold 75,000 shares on 21 May 2025 for gross proceeds of $1.37 million. No other securities were reported sold during that period.

The seller certifies that no undisclosed material adverse information is known and acknowledges liability for false statements under 18 U.S.C. 1001. Fields for relationship to issuer, contact details, and 10b5-1 plan adoption dates are blank, limiting insight into the seller’s corporate role or trading-plan protections.

Key Takeaways:

• Total planned and recent insider sales amount to 150,000 shares within ~5 weeks.
• Proposed sale value is 15% higher than the May proceeds, reflecting a higher reference price.
• While the percentage of total shares is minor, repeated insider selling can signal caution to investors.

Positive

• None.

Negative

• Repeated insider selling: 75,000 shares previously sold in May and another 75,000 shares now planned, potentially signalling reduced insider confidence.

Insights

Securities Analyst

TL;DR: Minor-size but repeat insider sale; signals slight negative sentiment, low absolute impact.

The Form 144 shows a second 75 k-share disposal slated for late June, following a similar May sale. Total insider liquidity raised approaches $3 million, yet still under 0.1% of Mirion’s float, so dilution is immaterial. Missing data on the seller’s management rank and absence of a 10b5-1 plan reduce clarity on the motivation. Investors typically view clustered insider sales as mildly bearish, but the limited scale means price impact should be modest unless accompanied by further disposals or negative news.

Corporate Governance Expert

TL;DR: Repeated sales without declared 10b5-1 plan raise governance optics concerns.

Rule 144 filings require certification that no non-public adverse information exists. However, the blank fields for plan adoption and relationship obscure whether the trade is pre-programmed or discretionary. While Rule 144 allows legitimate liquidity events, back-to-back sales can trigger shareholder scrutiny, especially if conducted by a senior officer. Governance best practice would be clearer disclosure of trading-plan status to mitigate perception risk.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Class A Common	UBS Financial Services, Inc. 1000 Harbor Blvd 3rd Floor Weehawken NJ 07086	75000	1575000.00	225554626	06/25/2025	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Class A Common	10/20/2021	IPO	Issuer			75000	10/20/2021	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Brian Schopfer 1218 MENLO DRIVE ATLANTA GA 30318	Class A Common	05/21/2025	75000	1370002.50

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

Why did Mirion Technologies (MIR) file a Form 144?

To notify the SEC of a planned sale of 75,000 Class A shares under Rule 144 by an insider.

How many MIR shares are being sold and what is their market value?

The filing covers 75,000 shares with an aggregate market value of $1.575 million.

What percentage of Mirion’s outstanding shares does the sale represent?

Approximately 0.03% of the 225,554,626 shares outstanding.

Were there recent insider sales prior to this notice?

Yes. Brian Schopfer sold 75,000 shares on 21 May 2025 for $1.37 million.

Is a Rule 10b5-1 trading plan disclosed in the filing?

No. The field for a 10b5-1 plan adoption date is blank, so no plan is indicated.

When is the approximate sale date for the planned transaction?

The filing lists 06/25/2025 as the approximate sale date.