Form 4: Mirion Director Sells 350,000 Shares in Pre-Planned Trade

Mirion Technologies Director Lawrence D. Kingsley sold 350,000 shares of Class A Common Stock for $24.728 per share under a Rule 10b5-1 trading plan.

Summary

• Lawrence D. Kingsley, a Director of Mirion Technologies, Inc. (MIR), reported a sale of company stock.
• The transaction involved the disposition of 350,000 shares of Class A Common Stock.
• The shares were sold at a price of $24.728 per share.
• The total value of the shares sold amounts to approximately $8,654,800.
• The sale was executed on December 10, 2025.
• The transaction was made pursuant to a contract, instruction, or written plan for the purchase or sale of equity securities, intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).
• Following this transaction, Lawrence D. Kingsley beneficially owns 3,509,075 shares indirectly through the Lawrence D. Kingsley Revocable Trust and 62,137 shares directly.

Sentiment

Score: 4

Explanation: The sentiment is slightly negative due to a director selling a substantial number of shares. However, the impact is mitigated by the disclosure that the sale was pre-planned under a Rule 10b5-1 plan, suggesting it was not based on new, undisclosed negative information.

Negatives

• A director selling a significant number of shares, even if pre-planned, can sometimes be perceived negatively by investors as it reduces insider ownership.

Future Outlook

The filing does not contain any forward-looking statements or guidance regarding the company's future performance or outlook.

Industry Context

This filing reports an individual insider transaction and does not provide broader industry context or trends. It reflects a director's personal portfolio management rather than a company-wide strategic move.

Corporate Governance

Stakeholder Impact

• Shareholders may interpret the director's sale as a signal, though the 10b5-1 plan suggests it's a scheduled event rather than a reaction to new company developments. It reduces the director's direct stake in the company.

Key Dates

Recommendation

The sale of 350,000 shares by a director is a notable event, but the disclosure that it was executed under a Rule 10b5-1 plan suggests it was a pre-scheduled transaction rather than a reaction to new, material information. While a reduction in insider ownership can sometimes be a yellow flag, the pre-planned nature tempers immediate concerns. Without additional context on the company's financial performance or strategic outlook, a 'hold' recommendation is appropriate, advising investors to monitor future insider activity and company fundamentals.

Keywords

Mirion Technologies, MIR, Insider Trading, Form 4, Stock Sale, Director, Lawrence D. Kingsley, 10b5-1 Plan