Welcome to our dedicated page for Mirion Technologies SEC filings (Ticker: MIR), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
This page provides access to U.S. Securities and Exchange Commission (SEC) filings for Mirion Technologies, Inc. (NYSE: MIR), a global provider of radiation detection, measurement, analysis, and monitoring solutions to nuclear, medical, defense, and research end markets. These filings offer detailed information on Mirion’s capital structure, financing arrangements, acquisitions, and periodic financial reporting.
Investors can review current reports on Form 8-K that Mirion files to disclose material events. In 2025, the company filed multiple 8-Ks describing an Equity Purchase Agreement to acquire, and later the completion of the acquisition of, the indirect parent of Paragon Energy Solutions. Other 8-Ks outline an underwriting agreement for a public offering of Class A common stock, the completion and terms of a private offering of Convertible Senior Notes due 2031, and amendments to the company’s credit agreement that establish a new tranche of term loans maturing in 2032 to refinance existing term loans.
Mirion also files 8-Ks to furnish quarterly earnings press releases, such as those announcing financial results for quarters ended June 30 and September 30, 2025. While these furnished materials are not deemed filed for certain liability purposes, they give context on revenue trends, profitability metrics, and guidance updates that complement the company’s periodic reports on Forms 10-K and 10-Q.
Through this filings page, users can follow Mirion’s use of equity and convertible debt financing, its acquisition-related disclosures, and its credit agreement refinancings. Stock Titan’s tools can help surface key points from lengthy documents, such as the main terms of convertible notes, conditions in acquisition agreements, or significant covenants and events of default in indentures and credit facilities. This makes it easier to understand how Mirion structures its obligations and reports material developments affecting MIR shareholders.
Kuwait Investment Authority (KIA), acting for the Government of the State of Kuwait, reports beneficial ownership of 10,171,591 shares of Mirion Technologies, Inc. Class A common stock as of January 19, 2026.
This represents 4.10% of Mirion’s Class A shares, based on 247,821,635 shares outstanding as of October 22, 2025. KIA has sole power to vote and dispose of all 10,171,591 shares and no shared voting or dispositive power.
KIA’s Mirion holdings were 10,000,000 shares as of December 31, 2022, 10,041,458 shares as of December 31, 2023, and 10,171,591 shares as of December 31, 2024, indicating gradual increases in absolute share count. KIA certifies that the securities are not held to change or influence control of Mirion, but as a passive investment.
Mirion Technologies, Inc. reported an insider stock transaction by one of its directors. On 12/31/2025, the director received 806 shares of Class A common stock, coded as an acquisition. The shares were issued as payment for the director’s quarterly retainer, which the director elected to take in vested stock rather than cash.
After this issuance, the director beneficially owns 62,943 Class A shares directly and an additional 3,509,075 shares indirectly through the Lawrence D. Kingsley Revocable Trust. This filing records the updated ownership levels and the use of stock instead of cash for board compensation.
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.
Mirion Technologies, Inc. Chief Financial Officer Brian Schopfer reported an automatic share withholding tied to equity compensation. On 12/27/2025, 8,500 shares of Class A common stock were withheld by the company to cover tax obligations arising from the vesting of previously granted restricted stock units. The filing notes this withholding was mandated under a pre-adopted company policy and did not involve a discretionary trade by the executive.
Following this transaction, Schopfer beneficially owned 893,432 shares of Class A common stock and 399,935 shares of Class B common stock, all held directly.
Mirion Technologies, Inc. reported an insider equity transaction by its Chief Legal Officer, Emmanuelle Lee. On 12/27/2025, 5,913 shares of Class A common stock were withheld at a price of $23.76 per share to cover tax obligations arising from the vesting of previously granted restricted stock units. This withholding was mandated by company policy and is not a discretionary trade. Following this transaction, Lee beneficially owned 78,727 shares of Class A common stock directly and 138,193 shares of Class B common stock directly. An additional 32,748 shares of Class B common stock are held indirectly through the Lee Revocable Living Trust for the benefit of Lee, Lee’s spouse, and other beneficiaries, with Lee disclaiming ownership beyond her pecuniary interest.
Mirion Technologies, Inc. Chief Human Resources Officer Alison Ulrich reported an automatic share withholding related to equity compensation. On 12/27/2025, the company withheld 134 shares of Class A common stock at a price of $23.76 per share to cover tax obligations arising from the vesting of previously granted restricted stock units. After this tax withholding, Ulrich beneficially owned 35,096 shares directly. The filing notes that the withholding was mandated by a pre-adopted company policy and did not represent a discretionary trade by the executive.
Mirion Technologies, Inc. director Kenneth Bockhorst reported a change in his holdings of Class A common stock. On December 8, 2025, he made a gift of 9,680 shares of Class A common stock to a donor advised fund and received no consideration for the transfer. Following this transaction, he directly beneficially owns 69,875 shares of Mirion Class A common stock. The filing is reported on a Form 4 as a transaction by a single reporting person serving as a director of the company.
Mirion Technologies director reports charitable stock gift. A Mirion Technologies, Inc. (MIR) director reported making a gift of 4,860 shares of Class A Common Stock on December 11, 2025. The filing states the shares were donated to a donor advised fund and that the director received no consideration for the transfer.
After this transaction, the director reports beneficial ownership of 72,736 shares of Class A Common Stock and 29,390 shares of Common Stock, all held directly. This is a personal ownership change and does not involve the company issuing new shares or receiving cash.
Mirion Technologies director reports significant share sale
Mirion Technologies, Inc. director Lawrence D. Kingsley reported selling 350,000 shares of the company’s Class A common stock on 12/10/2025. The transaction was coded as a sale at a price of $24.728 per share and was executed through the Lawrence D. Kingsley Revocable Trust.
Following this transaction, the trust beneficially owns 3,509,075 shares of Mirion Technologies indirectly, while an additional 62,137 shares are listed as directly owned. The filing is made on Form 4 by a single reporting person in his capacity as a director of the company.
Mirion Technologies (MIR) has a shareholder filing a notice of proposed sale under Rule 144 for up to 350,000 shares of Class A common stock. The planned sale is through UBS Financial Services on the NYSE, with an indicated aggregate market value of $8,750,000 and occurs against 245,000,000 shares outstanding of this class.
The securities to be sold were originally acquired on 11/05/2024 in a private transaction from the issuer totaling 3,150,000 shares. Over the past three months, the Lawrence D Kingsley Revocable Trust sold 300,000 Class A shares on 11/21/2025 for gross proceeds of $7,148,400, and this new notice outlines additional planned sales from that holding.
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