Filed Pursuant to Rule 424(b)(3)
Registration No. 333-268445

PROSPECTUS SUPPLEMENT 

(to Prospectus dated November 28, 2022)

$1,000,000,000
Class A Common Stock
Preferred Stock
Depositary Shares
Debt Securities
Warrants
Purchase Contracts
Units
Offered by Mirion Technologies, Inc.

Up to 7,326,423 Shares of our Class A Common Stock Issuable upon Redemption of Shares of
IntermediateCo Class B Common Stock
and
Up to 92,398,994 Shares of our Class A Common Stock for Resale
Offered by the Selling Holders

Mirion Technologies, Inc. (“Mirion,” the “Company,” “we,” “us,” or “our”) may from time to time offer and sell Class A common stock, preferred stock, depositary shares representing preferred stock, debt securities, warrants, purchase contracts or units in one or more offerings of up to $1,000,000,000 in aggregate offering price.

In addition, this prospectus supplement relates to the issuance by us of up to 7,326,423 shares of the Company’s Class A common stock upon the redemption of up to 7,326,423 shares of IntermediateCo Class B common stock, together with an equal number of shares of our Class B common stock.

The prospectus supplement also relates to the offer and resale from time to time by the Selling Holders named in this prospectus supplement (the “Selling Holders”), or their permitted transferees, of up to 92,398,994 shares of Class A common stock.

We will receive proceeds from the issuance and sale of our Class A common stock, preferred stock, depositary shares representing preferred stock, debt securities, warrants, purchase contracts or units. We will not receive any proceeds from the sale of shares of Class A common stock offered by the Selling Holders pursuant to this prospectus supplement. However, we will pay certain expenses associated with the sale of securities pursuant to this prospectus supplement, as described in the section titled “Plan of Distribution.”

Our registration of the securities covered by this prospectus supplement does not mean that either we or the Selling Holders will issue, offer or sell, as applicable, any of the securities. We and the Selling Holders may offer and sell the securities covered by this prospectus supplement in a number of different ways and at varying prices. The securities may be sold directly, through agents, or through underwriters and dealers. If agents, underwriters or dealers are used to sell the securities, we will name them in another prospectus supplement. We provide more information about how we and the Selling Holders may sell the securities in the section entitled “Plan of Distribution.”

Our Class A common stock is listed on The New York Stock Exchange (“NYSE”) under the symbol “MIR.” On June 3, 2024, the closing price for our Class A common stock, as reported on NYSE, was $10.37 per share.

Investing in our securities involves a high degree of risk. You should review carefully the risks and uncertainties referenced under the heading “Risk Factors” contained in this prospectus supplement beginning on page 8, and contained in our Quarterly Report on Form 10-Q for the quarter ended March 31, 2024, both of which are incorporated herein by reference, as amended or supplemented from time to time by any risk factors we include in subsequent Annual or Quarterly Reports on Form 10-K or 10-Q, respectively, and incorporated herein by reference, and any applicable prospectus supplement, and under similar headings in the other documents that are incorporated by reference into this prospectus supplement.

Explanatory Note: The securities are not being newly registered. This prospectus supplement is being filed to remove certain Selling Holders, as well as warrants previously exchanged for Class A common stock, exercised or redeemed, from the original prospectus filed on November 28, 2022. With the exception of the inclusion of this explanatory note, this filing conforms to the version of this prospectus that was delivered to investors within the time prescribed by Rule 424(b)(3) under the U.S. Securities Act of 1933, as amended.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement. Any representation to the contrary is a criminal offense.

The date of this prospectus supplement is June 4, 2024.

TABLE OF CONTENTS

Page

About This Prospectus Supplement

This prospectus supplement is part of a registration statement that we filed with the Securities and Exchange Commission (the “SEC”) using a “shelf” registration process. Under this shelf registration process, we and the Selling Holders may, from time to time, issue, offer and sell, as applicable, any combination of the securities described in this prospectus supplement in one or more offerings.

Neither we nor the Selling Holders have authorized anyone to provide any information or to make any representations other than those contained in this prospectus supplement or any free writing prospectus we have prepared. We and the Selling Holders take no responsibility for, and can provide no assurance as to the reliability of, any other information that others may give you. This prospectus supplement is an offer to sell only the securities offered hereby and only under circumstances and in jurisdictions where it is lawful to do so. No dealer, salesperson or other person is authorized to give any information or to represent anything not contained in this prospectus supplement or any free writing prospectus. This prospectus supplement is not an offer to sell securities, and it is not soliciting an offer to buy securities, in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus supplement is accurate only as of the date on the front of those documents, regardless of the time of delivery of this prospectus supplement, or any sale of a security. Our business, financial condition, results of operations and prospects may have changed since those dates.

All of the summaries are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference as exhibits to the registration statement of which this prospectus supplement is a part, and you may obtain copies of those documents as described below under “Where You Can Find More Information.”

This prospectus supplement contains some of our trademarks, service marks and trade names, including, among others, Mirion, Mirion Technologies, DMC 3000 Electronic Dosimeter, the Mirion Battlefield Dosimeter, Accurad PRD and Instadose. Each one of these trademarks, service marks or trade names is either (1) our registered trademark, (2) a trademark for which we have a pending application or (3) a trade name or service mark for which we claim common law rights. All other trademarks, trade names or service marks of any other company appearing in this prospectus supplement belong to their respective owners. Solely for convenience, the trademarks, service marks and trade names referred to in this prospectus supplement are presented without the TM, SM and ^® symbols, but such references are not intended to indicate, in any way, that we will not assert, to the fullest extent under applicable law, our respective rights or the rights of the applicable licensors to these trademarks, service marks and trade names.

Unless the context otherwise indicates, references in this prospectus supplement to “we,” “our” and “us” refer, collectively, to Mirion Technologies, Inc., a Delaware corporation, and its consolidated subsidiaries.

Frequently Used Terms

Unless otherwise stated in this prospectus supplement or the context otherwise requires, references to:

Cautionary Note Regarding Forward-Looking Statements

This prospectus supplement contains forward-looking statements within the meaning of the “safe-harbor” provisions of the Private Securities Litigation Reform Act of 1995 that reflect future plans, estimates, beliefs, and expected performance. All statements contained in this prospectus supplement other than statements of historical fact, including statements regarding the offerings of securities under this prospectus supplement and the use of proceeds therefrom are forward-looking statements. When used in this prospectus supplement, words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “strive,” “seeks,” “plans,” “scheduled,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. When we discuss our strategies or plans we are making projections, forecasts or forward-looking statements. Such statements are based on the beliefs of, as well as assumptions made by and information currently available to, our management.

The forward-looking statements contained in this prospectus supplement are based on our current expectations and beliefs concerning future developments and their potential effects on us. There can be no assurance that future developments affecting us will be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond our control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to, the following risks, uncertainties and other factors:

There can be no assurance that future developments affecting us will be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond our control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. Should one or more of these risks or uncertainties materialize, or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements.

Forward-looking statements included in this prospectus supplement speak only as of the date of this prospectus supplement or any earlier date specified for such statements. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws.

Risk Factors

An investment in our securities involves a high degree of risk. Before making an investment decision, you should carefully consider the following risk factors, in addition to the risks and uncertainties discussed above under “Special Note Regarding Forward-Looking Statements,” together with the risk factors described in our most recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q filed with the SEC and any subsequent Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K that we file with the SEC after the date of this prospectus supplement, as well as the other information contained or incorporated by reference in this prospectus supplement, in light of your particular investment objectives and financial circumstances. The occurrence of one or more of the events or circumstances described in such risk factors, alone or in combination with other events or circumstances, may have an adverse effect on our business, cash flows, financial condition and results of operations. We may face additional risks and uncertainties that are not presently known to us that we currently deem immaterial, which may also impair our business or financial condition.

Risks Related to Ownership of our Securities

The price of our Class A common stock may be volatile.

The price of our Class A common stock may fluctuate due to a variety of factors, including:

In addition, the stock market in general has experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of listed companies. Broad market and industry

factors may significantly impact the market price of our Class A common stock, regardless of our actual operating performance. In addition, in the past, following periods of volatility in the overall market and the market prices of a particular company’s securities, securities class action litigation has often been instituted against that company. Securities litigation, if instituted against us, could result in substantial costs and divert our management’s attention and resources from our business. Any of the factors listed above could materially and adversely affect your investment in our securities, and our securities may trade at prices significantly below the price you paid for them. In such circumstances, the trading price of our securities may not recover and may experience a further decline.

The coverage of our business or our securities by securities or industry analysts or the absence thereof could adversely affect the price of our securities and trading volume.

The trading market for our securities will be influenced in part by the research and other reports that industry or securities analysts may publish about us or our business or industry from time to time. We do not control these analysts or the content and opinions included in their reports. As a former special purpose acquisition company, we may be slow to attract equity research coverage, and the analysts who publish information about our securities will have had relatively little experience with our company, which could affect their ability to accurately forecast our results and make it more likely that we fail to meet their estimates. If no or few analysts commence equity research coverage of us, the trading price and volume of our securities would likely be negatively impacted. If analysts do cover us and one or more of them downgrade our securities, or if they issue other unfavorable commentary about us or our industry or inaccurate research, our stock price would likely decline. Furthermore, if one or more of these analysts cease coverage or fail to regularly publish reports on us, we could lose visibility in the financial markets. Any of the foregoing would likely cause our stock price and trading volume to decline.

Even if we are actively covered by analysts, we do not have any control over the analysts or the measures that analysts or investors may rely upon to forecast our future results. Overreliance by analysts or investors on any particular metric to forecast our future results may lead to forecasts that differ significantly from our own.

We may require additional capital to support our growth plans, and such capital may not be available on terms acceptable to us, if at all. This could hamper our growth and adversely affect our business.

We intend to continue to make significant investments to support our business growth and may require additional funds to respond to business challenges, improve our operating infrastructure or acquire complementary businesses, personnel and technologies. Accordingly, we may need to engage in equity or debt financings to secure additional funds, including for possible use in acquisitions. If we raise additional funds through future issuances of equity or convertible debt securities, our existing stockholders could suffer significant dilution, and any new equity securities we issue could have rights, preferences and privileges superior to those of holders of our Class A common stock.

Any additional debt financing that we secure in the future could involve offering additional security interests and undertaking restrictive covenants relating to our capital raising activities and other financial and operational matters, which may make it more difficult for us to obtain additional capital and to pursue business opportunities, including potential acquisitions. Additionally, the COVID-19 pandemic has disrupted capital markets, and if we seek to access additional capital or increase our borrowing, there can be no assurance that debt or equity financing may be available to us on favorable terms, if at all. If we are unable to obtain adequate financing or financing on terms satisfactory to us when we require it, our ability to continue to support our business growth and to respond to business challenges could be significantly impaired, and our business, results of operations and financial condition may be harmed.

The issuance of additional shares of our Class A common stock or other equity or equity-linked securities, or sales of a significant portion of our Class A common stock, could depress the market price of our Class A common stock.

Future issuances of shares of our Class A common stock, or of securities convertible into or exercisable for our Class A common stock, could depress the market price of our Class A common stock and result in significant dilution for holders of our Class A common stock. The vesting and settlement of our restricted stock units would result in additional dilution to holders of our Class A common stock. In the future, we may issue additional shares of our Class A common stock, or securities convertible into or exercisable for Class A common stock, in connection

with generating additional capital, future acquisitions, repayment of outstanding indebtedness, under our Incentive Plan, or for other reasons.

The market price of shares of our Class A common stock could decline as a result of substantial sales of Class A common stock, particularly by our significant stockholders, a large number of shares of Class A common stock becoming available for sale or the perception in the market that holders of a large number of shares intend to sell their shares.

Pursuant to the RRA, the stockholders party thereto are entitled to, among other things, certain registration rights, including demand, piggy-back and shelf registration rights. If one or more of these stockholders were to sell a substantial portion of the shares they hold, it could cause the trading price of our Class A common stock to decline.

We may elect to issue shares of our Class A common stock in connection with the redemption of shares of IntermediateCo Class B common stock and the founder shares may vest, each of which would increase the number of shares eligible for future resale in the public market and result in dilution to our stockholders.

As of the date of this prospectus supplement, up to 7,326,423 shares of Class A common stock may be issued in connection with the redemption of IntermediateCo Class B common stock and up to 18,750,000 founder shares may vest and become unrestricted upon the occurrence of certain vesting requirements. To the extent such shares are issued or become unrestricted, additional shares of our Class A common stock will be issued or become eligible for resale, which will result in dilution to the holders of our common stock and increase the number of shares eligible for resale in the public market. Sales of substantial numbers of such shares in the public market could adversely affect the market price of our Class A common stock.

We have not and may not pay cash dividends for the foreseeable future.

We currently intend to retain our future earnings, if any, to finance the further development and expansion of our business and does not intend to pay cash dividends in the foreseeable future. Any future determination to pay dividends will be at the discretion of our Board and will depend on our financial condition, results of operations, capital requirements, restrictions contained in future agreements and financing instruments, business prospects and such other factors as our Board deems relevant.

We are subject to certain ownership and voting power laws and regulations which may limit the ability of stockholders to acquire our Class A common stock and therefore limit demand for our Class A common stock.

Under foreign direct investment (FDI) and public interest laws, including in Germany, Finland, France, and the UK, and potentially other jurisdictions, certain acquisitions of our Class A common stock by investors are subject to government approval requirements. For example, in Germany, German FDI law require foreign investors to obtain approval from the German Federal Ministry for Economic Affairs and Energy for the direct or indirect acquisition of shares of a German company if the acquirer directly or indirectly holds at least 10% of the voting rights of the company following the acquisition. Any acquisition in violation of the aforementioned provisions of German FDI law may be void. Any violation of the prohibition to consummate an acquisition without approval of the Ministry may be subject to sanctions. Similar FDI laws exist in other jurisdictions in which we have substantial operations. In Finland, government approvals are required if an investor holds at least 10% of the voting rights of the company following the investment. In France, the prior approval from the French Minister of Economy is required if a non-EU investor exceeds, directly or indirectly, 25% of the voting rights of the French entities of the company following the investment or, for an EU non-French investor, in case of acquisition of control, direct or indirect, of the French entities. The U.K. has a 25% voting rights threshold for mandatory filings under the National Security and Investment Act 2021 which became operational on January 4, 2022. Accordingly, these restrictions on and approval requirements for the acquisition of a substantial shareholding in our share capital may restrict certain investments and limit demand for shares of our Class A common stock.

Anti-takeover provisions contained in our Charter and Bylaws, as well as provisions of Delaware law, could impair a takeover attempt.

Our Charter and Bylaws contain provisions that may discourage unsolicited takeover proposals that stockholders may consider to be in their best interests. We are also subject to anti-takeover provisions under Delaware law, which could delay or prevent a change of control. Together, these provisions may make more difficult the removal of management and may discourage transactions that otherwise could involve payment of a premium over prevailing market prices for our securities. Certain of these provisions provide:

Our Charter includes forum selection clauses, which could discourage claims or limit stockholders’ ability to make a claim against us, our directors, officers, other employees or stockholders.

Our Charter provides that, unless we consent in writing to the selection of an alternative forum, the Court of Chancery in the State of Delaware shall be the sole and exclusive forum for any stockholder (including a beneficial owner) to bring: (a) any derivative action or proceeding brought on behalf of the Company; (b) any claim or cause of action for breach of a fiduciary duty owed by any current or former director, officer or other employee of the Company, to the Company or the Company’s stockholders; (c) any claim or cause of action against the Company or any current or former director, officer or other employee of the Company, arising out of or pursuant to any provision of the DGCL or our certificate of incorporation or bylaws; (d) any claim or cause of action seeking to interpret, apply, enforce or determine the validity of our certificate of incorporation or bylaws (as each may be amended from time to time, including any right, obligation, or remedy thereunder), (e) any claim or cause of action as to which the DGCL confers jurisdiction on the Court of Chancery of the State of Delaware; and (f) any claim or cause of action against the Company or any current or former director, officer or other employee of the Company, governed by the internal- affairs doctrine, in all cases to the fullest extent permitted by law and subject to the court having personal jurisdiction over the indispensable parties named as defendants. In addition, our Charter provides that, unless we consent in writing to the selection of an alternative forum, the federal district courts of the United States will be the exclusive forum for resolving any complaint asserting a cause of action arising under the Securities Act.

Notwithstanding the foregoing, the Securities Act forum selection clause will not apply to suits brought to enforce any liability or duty created by the Exchange Act or any other claim for which the federal district courts of the United States of America shall be the sole and exclusive forum. These forum selection clauses may discourage claims or limit stockholders’ ability to submit claims in a judicial forum that they find favorable and may result in additional costs for a stockholder seeking to bring a claim. While we believe the risk of a court declining to enforce these forum selection clauses is low, if a court were to determine a forum selection clause to be inapplicable or unenforceable in an action, we may incur additional costs in conjunction with our efforts to resolve the dispute in an alternative jurisdiction, which could have a negative impact on our business, results of operations and financial condition.

We may be subject to securities litigation, which is expensive and could divert management attention and result in significant legal expenses and settlement or damage awards.

The market price of our Class A common stock may be volatile and, in the past, companies that have experienced volatility in the market price of their stock have been subject to securities class action litigation. We have and may in the future become subject to claims and litigation alleging violations of the securities laws or other related claims, which could harm our business and require us to incur significant costs. We are generally obliged, to the extent permitted by law, to indemnify our current and former directors and officers who are named as defendants in these types of lawsuits. Regardless of the outcome, litigation may require significant attention from management and could result in significant legal expenses, settlement costs or damage awards that could materially and adversely affect our business, results of operations and financial condition.

Use of Proceeds

Unless we inform you otherwise in another prospectus supplement, we intend to use the net proceeds from the sale of the securities offered by us by this prospectus supplement for general corporate purposes, which may include capital expenditures and working capital. Our management will have broad discretion over the use of such proceeds.

All of the shares of Class A common stock offered by the Selling Holders pursuant to this prospectus supplement will be sold by the Selling Holders for their respective accounts. We will not receive any of the proceeds from these sales.

Description of Capital Stock

The following description of our capital stock is intended as a summary only and therefore is not a complete description. This description is based upon, and is qualified by reference to, our Charter, Bylaws and applicable provisions of Delaware corporate law. You should read our Charter and Bylaws each of which is filed as an exhibit to the registration statement of which this prospectus supplement forms a part, for a complete description of the rights and preferences of our securities.

General

Our authorized capital stock consists of 700,000,000 shares of capital stock, par value $0.0001 per share, of which:

Our Board is authorized, without stockholder approval, except as required by the listing standards of the NYSE, to issue additional shares of capital stock within these limits.

As of the date of this prospectus supplement, we had approximately 220,159,325 shares of Class A common stock outstanding, including 18,750,000 founder shares subject to vesting requirements, approximately 7,326,423 shares of Class B common stock outstanding and no shares of preferred stock outstanding.

Common Stock

Class A Common Stock

Holders of shares of our Class A common stock are entitled to one vote for each share held of record on all matters on which stockholders are entitled to vote generally, including the election or removal of directors. The holders of our Class A common stock do not have cumulative voting rights in the election of directors.

Holders of shares of our Class A common stock are entitled to receive dividends when and if declared by our Board out of funds legally available therefor, subject to any statutory or contractual restrictions on the payment of dividends and to any restrictions on the payment of dividends imposed by the terms of any outstanding preferred stock.

Upon our liquidation, dissolution or winding up and after payment in full of all amounts required to be paid to creditors and to the holders of preferred stock having liquidation preferences, if any, the holders of shares of our Class A common stock will be entitled to receive pro rata our remaining assets available for distribution.

Class B Common Stock

Holders of shares of our Class B common stock are entitled to one vote for each share held of record on all matters on which stockholders are entitled to vote generally, including the election or removal of directors. If at any time the ratio at which shares of IntermediateCo Class B common stock are redeemable or exchangeable for shares of our Class A common stock changes from one-for-one, the number of votes to which our Class B common stockholders are entitled will be adjusted accordingly. The holders of our Class B common stock do not have cumulative voting rights in the election of directors.

Except for transfers to us pursuant to the certificate of incorporation of IntermediateCo (the “IntermediateCo Charter”) or to certain permitted transferees set forth in our Charter, the shares of our Class B common stock and corresponding shares of IntermediateCo Class B common stock may not be sold, transferred or otherwise disposed of.

Holders of shares of our Class B common stock are not entitled to economic interests in us or to receive dividends or to receive a distribution upon our liquidation or winding up. However, if IntermediateCo makes distributions to us other than solely with respect to our Class A common stock, the holders of IntermediateCo Class B common stock will be entitled to receive distributions pro rata in accordance with the percentages of their respective shares of IntermediateCo Class B common stock.

Voting Rights

Except as otherwise required in our Charter or by applicable law, the holders of our common stock will vote together as a single class on all matters on which stockholders generally are entitled to vote.

The holders of the outstanding shares of our Class A common stock shall be entitled to vote separately upon any amendment to our Charter (including by merger, consolidation, reorganization or similar event) that would alter or change the powers, preferences or special rights of our Class A common stock in a manner that is materially and disproportionately adverse as compared to any alteration or change to our Class B common stock.

The holders of the outstanding shares of our Class B common stock shall be entitled to vote separately upon any amendment to our Charter (including by merger, consolidation, reorganization or similar event) that would alter or change the powers, preferences or special rights of our Class B common stock in a manner that is materially and disproportionately adverse as compared to any alteration or change to our Class A common stock, subject to certain exceptions set forth in our Charter.

Redemption and Exchange

Under the IntermediateCo Charter, the holders of IntermediateCo Class B common stock have the right (subject to the terms of the IntermediateCo Charter) to require IntermediateCo to redeem all or a portion of their shares of IntermediateCo Class B common stock for, at our election, (1) newly issued shares of our Class A common stock on a one-for-one basis or (2) a cash payment equal to the arithmetic average of the closing stock prices for a share of our Class A common stock for each of three (3) consecutive full trading days ending on and including the last full trading day immediately prior to the date of redemption (subject to customary adjustments, including for stock splits, stock dividends and reclassifications) in accordance with the terms of the IntermediateCo Charter. Additionally, in the event of a redemption request by a holder of IntermediateCo Class B common stock, we may, at our election, effect a direct exchange of cash or our Class A common stock for IntermediateCo Class B common stock in lieu of such a redemption. Shares of our Class B common stock will be canceled on a one-for-one basis if we, following a redemption request of a holder of IntermediateCo Class B common stock, redeem or exchange IntermediateCo Class B common stock of such holder of IntermediateCo Class B common stock pursuant to the terms of the IntermediateCo Charter.

Valid Issuance

All shares of our Class A common stock and Class B common stock that are outstanding are fully paid and non-assessable. Our common stock is not subject to calls or assessments by us. The rights, powers and privileges of our common stock is subject to those of the holders of any shares of our preferred stock or any other series or class of stock we may authorize and issue in the future.

Preferred Stock

This prospectus supplement describes certain general terms and provisions of our preferred stock. When we offer to sell a particular series of preferred stock, we will describe the specific terms of the securities in another supplement to this prospectus. Such other prospectus supplement will also indicate whether the general terms and provisions described in this prospectus supplement apply to the particular series of preferred stock. The preferred stock will be issued under a certificate of designation relating to each series of preferred stock and is also subject to our Charter.

Under our Charter, our Board has the authority to:

Our Board may issue authorized shares of preferred stock, as well as authorized but unissued shares of common stock, without further stockholder action, unless stockholder action is required by applicable law or by the rules of a stock exchange or quotation system on which any series of our stock may be listed or quoted.

The prospectus supplement will describe the terms of any preferred stock being offered, including:

All shares of preferred stock offered will be fully paid and non-assessable. Any shares of preferred stock that are issued will have priority over the common stock with respect to dividend or liquidation rights or both.

Our Board could create and issue a series of preferred stock with rights, privileges or restrictions which effectively discriminates against a then-existing or prospective holder of preferred stock as a result of the holder beneficially owning or commencing a tender offer for a substantial amount of common stock. One of the effects of authorized but unissued and unreserved shares of capital stock may be to make it more difficult or discourage an attempt by a potential acquirer to obtain control of our company by means of a merger, tender offer, proxy contest or otherwise. The issuance of these shares of capital stock may defer or prevent a change in control of our company without any further stockholder action.

The transfer agent for each series of preferred stock will be described in the relevant prospectus supplement.

Authorized but Unissued Capital Stock

Delaware law does not require stockholder approval for any issuance of authorized shares. However, the listing requirements of the NYSE, which would apply so long as shares of our Class A common stock remain listed on the NYSE, require stockholder approval of certain issuances equal to or exceeding 20% of the then outstanding voting power or the then outstanding number of shares of Class A common stock (we believe the position of the NYSE is that the calculation in this latter case treats as outstanding shares of our Class A common stock issuable upon

redemption or exchange of outstanding shares of IntermediateCo Class B common stock not held by us). These additional shares of our Class A common stock may be used for a variety of corporate purposes, including future public offerings, to raise additional capital or to facilitate acquisitions.

Transfer Restrictions

Holders of our common stock that received such stock pursuant to the Business Combination are subject to certain transfer restrictions set forth in the RRA.

Exclusive Forum

Our Charter provides that the sole and exclusive forum for (1) any derivative action or proceeding brought on our behalf; (2) any action asserting a claim of breach of a fiduciary duty owed by any of our current or former directors, officers or other employees to us or our stockholders; (3) any action asserting a claim against us or any current or former director, officer or other employee of us arising out of or pursuant to any provision of the DGCL, our Charter or our Bylaws; (4) any action to interpret, apply, enforce, or determine the validity of our Charter or our Bylaws; (5) any claim or cause of action as to which the DGCL confers jurisdiction on the Court of Chancery of the State of Delaware; and (6) any other action asserting a claim that is governed by the internal affairs doctrine shall be a state or federal court located within the State of Delaware, in all cases subject to the court having jurisdiction over indispensable parties named as defendants. However, this exclusive forum provision would not apply to suits brought to enforce a duty or liability created by the Securities Act, or the Exchange Act or any claim for which the federal district courts of the United States have exclusive jurisdiction.

In addition, our Charter provides that, unless we consent in writing to the selection of an alternative forum, the federal district courts of the United States will be the exclusive forum for resolving any complaint asserting a cause of action arising under the Securities Act. However, this exclusive forum provision would not apply to suits brought to enforce a duty or liability created by the Exchange Act or any claim for which the federal district courts of the United States have exclusive jurisdiction.

Any person or entity purchasing or otherwise acquiring any interest in our capital stock shall be deemed to have notice of and consented to these provisions and will not be deemed to have waived our compliance with the federal securities laws and the regulations promulgated thereunder. Although our Board believes these provisions benefit us by providing increased consistency in the application of Delaware law or federal law for the specified types of actions and proceedings, these provisions may have the effect of discouraging lawsuits against us or our directors and officers.

Limitations on Liability and Indemnification of Officers and Directors

Our Charter provides that we will indemnify our directors to the fullest extent authorized or permitted by applicable law. We have also entered into agreements to indemnify our directors, executive officers and other employees as determined by our Board. Under our Bylaws, we are required to indemnify each of our directors and officers if the basis of the indemnitee’s involvement was by reason of the fact that the indemnitee is or was a director or officer of us or was serving at our request as a director, officer, employee or agent for another entity. We must indemnify our officers and directors against all expenses, judgments, fines and amounts paid in settlement actually and reasonably incurred by the indemnitee in connection with such action, suit or proceeding if the indemnitee acted in good faith and in a manner the indemnitee reasonably believed to be in or not opposed to our best interests, and, with respect to any criminal action or proceeding, had no reasonable cause to believe the indemnitee’s conduct was unlawful. Our Charter also requires us to advance expenses incurred by a director or officer in connection with such action, suit or proceeding to the maximum extent permitted under Delaware law. Any claims for indemnification by our directors and officers may reduce our available funds to satisfy successful third-party claims against us and may reduce the amount of money available to us.

Corporate Opportunities

Delaware law permits corporations to adopt provisions renouncing any interest or expectancy in certain opportunities that are presented to the corporation or its officers, directors or stockholders. Our Charter contains provisions renouncing, to the extent permitted by Delaware law, any interest or expectancy that we have in, or right

to be offered an opportunity to participate in, specified business opportunities that are from time to time presented to a member of our Board who is not an employee, or any partner, member, director, stockholder, employee or agent of such member. Notwithstanding the foregoing, our Charter does not renounce any interest in a business opportunity that is expressly offered to a director solely in his or her capacity as one of our directors.

Anti-Takeover Effects of Our Charter and Our Bylaws

Our Charter and our Bylaws contain provisions that could have the effect of delaying, deferring or discouraging another party from acquiring control of us. These provisions and certain provisions of Delaware law, which are summarized below, could discourage takeovers, coercive or otherwise. These provisions are also designed, in part, to encourage persons seeking to acquire control of us to negotiate first with our Board. Our Board believes that the benefits of increased protection of the potential ability to negotiate with an unfriendly or unsolicited acquirer outweigh the disadvantages of discouraging a proposal to acquire us.

Issuance of Undesignated Preferred Stock

As discussed above in the section titled “—Preferred Stock,” our Board has the ability to designate and issue preferred stock with voting or other rights or preferences that could deter hostile takeovers or delay changes in our control or management.

Limits on Ability of Stockholders to Act by Written Consent or Call a Special Meeting

Our Charter provides that our stockholders may not act by written consent. This limit on the ability of stockholders to act by written consent may lengthen the amount of time required to take stockholder actions. As a result, the holders of a majority of our common stock would not be able to amend our Charter or our Bylaws or remove directors without holding a meeting of stockholders called in accordance with our Bylaws.

In addition, our Charter provides that special meetings of the stockholders may be called only by the chairman of our Board, our chief executive officer or our Board acting pursuant to a resolution adopted by a majority of our Board. A stockholder may not call a special meeting, which may delay the ability of our stockholders to force consideration of a proposal or for holders controlling a majority of our capital stock to take any action, including the removal of directors.

Advance Requirements for Advance Notification of Stockholder Nominations and Proposals

Our Bylaws establish advance notice procedures with respect to stockholder proposals and the nomination of candidates for election as directors, other than nominations made by or at the direction of our Board or a committee thereof. These advance notice procedures may have the effect of precluding the conduct of certain business at a meeting if the proper procedures are not followed and may also discourage or deter a potential acquirer from conducting a solicitation of proxies to elect its own slate of directors or otherwise attempt to obtain control us.

Election and Removal of Directors

Our Charter and our Bylaws contain provisions that establish specific procedures for appointing and removing members of our Board. Under our Charter and our Bylaws, vacancies and newly created directorships on our Board may be filled only by a majority of the directors then serving on our Board.

At the Closing, we and the Sponsor also entered into a director nomination agreement (the “GS Director Nomination Agreement”) that provides the Sponsor with a right to representation on our Board. The GS Director Nomination Agreement grants the Sponsor the ongoing right (but not the obligation) to appoint or nominate to the Board of Directors two (2) individuals (the “GS Sponsor Directors”), to serve as director of the Company. The GS Director Nomination Agreement will terminate automatically when the GS Holders, collectively with their

respective affiliates, hold less than 50% of the founder shares held by them at the Closing, or upon the mutual written agreement of the parties.

No Cumulative Voting

The DGCL provides that stockholders are not entitled to the right to cumulate votes in the election of directors unless our Charter provides otherwise. Our Charter does not expressly provide for cumulative voting. Without cumulative voting, a minority stockholder may not be able to gain as many seats on our Board as the stockholder would be able to gain if cumulative voting were permitted. The absence of cumulative voting makes it more difficult for a minority stockholder to gain a seat on our Board to influence our Board’s decision regarding a takeover.

Amendment of Our Charter and Our Bylaws

The affirmative vote of holders of not less than 66 2/3% of the total voting power of all our outstanding securities generally entitled to vote in the election of directors, voting together as a single class will be required to amend, alter, change or repeal specified provisions of our Charter, including those relating to the terms of our common stock, actions by written consent of stockholders, calling of special meetings of stockholders, election and removal of directors, certain indemnification and corporate opportunity matters, and the required vote to amend our Charter and our Bylaws. Our Bylaws may only be amended by our Board or the affirmative vote of holders of not less than 66 2/3% of the total voting power of all of our outstanding securities generally entitled to vote in the election of directors, voting together as a single class. This requirement of a super- majority vote to approve amendments to our Charter and our Bylaws could enable a minority of our stockholders to exercise veto power over any such amendments.

Delaware Anti-Takeover Statute

We are subject to the provisions of Section 203 of the DGCL regulating corporate takeovers. In general, Section 203 prohibits a publicly held Delaware corporation from engaging, under certain circumstances, in a business combination with an interested stockholder for a period of three years following the date the person became an interested stockholder unless:

Generally, a business combination includes a merger, asset or stock sale, or other transaction resulting in a financial benefit to the interested stockholder. An interested stockholder is a person who, together with affiliates and associates, owns or, within three years prior to the determination of interested stockholder status, did own 15% or more of a corporation’s outstanding voting stock. Our Board expects the existence of this provision to have an anti-takeover effect with respect to transactions our Board does not approve in advance.

The provisions of Delaware law and the provisions of our Charter and our Bylaws could have the effect of discouraging others from attempting hostile takeovers and as a consequence, they might also inhibit temporary fluctuations in the market price of our Class A common stock that often result from actual or rumored hostile takeover attempts. These provisions might also have the effect of preventing changes in our management. It is also

possible that these provisions could make it more difficult to accomplish transactions that stockholders might otherwise deem to be in their best interests.

Listing

Our Class A common stock is listed on the NYSE under the symbol “MIR.”

Transfer Agent

The transfer agent for our common stock is Continental Stock Transfer & Trust Company.

Description Of Debt Securities

We may offer debt securities which may be senior or subordinated. We refer to senior debt securities and subordinated debt securities collectively as debt securities. Each series of debt securities may have different terms. The following description summarizes the general terms and provisions of the debt securities. We will describe the specific terms of the debt securities and the extent, if any, to which the general provisions summarized below apply to any series of debt securities in the prospectus supplement relating to the series and any applicable free writing prospectus that we authorize to be delivered.

We may issue senior debt securities from time to time, in one or more series under a senior indenture to be entered into between us and a senior trustee to be named in a prospectus supplement, which we refer to as the senior trustee. We may issue subordinated debt securities from time to time, in one or more series, under a subordinated indenture to be entered into between us and a subordinated trustee to be named in a prospectus supplement, which we refer to as the subordinated trustee. The forms of senior indenture and subordinated indenture are filed as exhibits to the registration statement of which this prospectus supplement forms a part. Together, the senior indenture and the subordinated indenture are referred to as the indentures and, together, the senior trustee and the subordinated trustee are referred to, collectively, as the trustee. This prospectus supplement briefly outlines some of the provisions of the indentures. The following summary of the material provisions of the indentures is qualified in its entirety by the provisions of the indentures, including definitions of certain terms used in the indentures. Wherever we refer to particular sections or defined terms of the indentures, those sections or defined terms are incorporated by reference in this prospectus supplement. You should review the forms of indentures that are filed as exhibits to the registration statement of which this prospectus supplement forms a part for additional information. As used in this prospectus supplement, the term “debt securities” includes the debt securities which may be offered in this prospectus supplement and all other debt securities issued by us under the indentures.

General

The indentures:

Unless otherwise provided in the applicable prospectus supplement, the senior debt securities will be unsubordinated obligations and will rank equally with all of our other unsecured and unsubordinated indebtedness. Payments on the subordinated debt securities will be subordinated to the prior payment in full of all of our senior indebtedness, as described under “—Subordination” and in the applicable prospectus supplement.

Each indenture provides that we may, but need not, designate more than one trustee under an indenture. Any trustee under an indenture may resign or be removed and a successor trustee may be appointed to act with respect to the series of debt securities administered by the resigning or removed trustee. If two or more persons are acting as trustee with respect to different series of debt securities, each trustee shall be a trustee of a trust under the applicable indenture separate and apart from the trust administered by any other trustee. Except as otherwise indicated in this prospectus supplement, any action described in this prospectus supplement to be taken by each trustee may be taken by each trustee with respect to, and only with respect to, the one or more series of debt securities for which it is trustee under the applicable indenture.

The prospectus supplement for each offering will provide the following terms with respect to any series of debt securities, where applicable:

securities are stated to be payable, then the period or periods within which, and the terms and conditions upon which, such election may be made;

We may issue debt securities that provide for less than the entire principal amount thereof to be payable upon declaration of acceleration of the maturity of the debt securities. We refer to any such debt securities throughout this prospectus supplement as “original issue discount securities.”

We will provide you with more information in the applicable prospectus supplement regarding any deletions, modifications, or additions to the events of default or covenants that are described below, including any addition of a covenant or other provision providing event risk or similar protection.

Payment

Unless otherwise provided in the applicable prospectus supplement, the principal of, and any premium or make-whole amount, and interest on, any series of the debt securities will be payable by mailing a check to the address of the person entitled to it as it appears in the applicable register for the debt securities or by wire transfer of funds to that person at an account maintained within the United States.

All monies that we pay to a paying agent or a trustee for the payment of the principal of, and any premium, or interest on, any debt security will be repaid to us if unclaimed at the end of two years after the obligation underlying payment becomes due and payable. After funds have been returned to us, the holder of the debt security may look only to us for payment, without payment of interest for the period which we hold the funds.

Conversion or Exchange Rights

Debt securities may be convertible into or exchangeable for our other securities or property. The terms and conditions of conversion or exchange will be set forth in the applicable prospectus supplement. The terms will include, among others, the following:

Merger, Consolidation or Sale of Assets

The indentures provide that we may, without the consent of the holders of any outstanding debt securities, (i) consolidate with, (ii) sell, lease or convey all or substantially all of our assets to, or (iii) merge with or into, any other entity provided that:

Events of Default, Notice and Waiver

Unless the applicable prospectus supplement states otherwise, when we refer to “events of default” as defined in the indentures with respect to any series of debt securities, we mean:

If an event of default (other than an event of default described in the fourth bullet point above) occurs and is continuing with respect to debt securities of any series outstanding, then the applicable trustee or the holders of 25% or more in principal amount of the debt securities of that series will have the right to declare the principal amount of, and accrued interest on, all the debt securities of that series to be due and payable. If an event of default described in the fourth bullet point above occurs, the principal amount of, and accrued interest on, all the debt securities of that series will automatically become and will be immediately due and payable without any declaration or other act on the part of the trustee or the holders of the debt securities. However, at any time after such a declaration of acceleration has been made, but before a judgment or decree for payment of the money due has been obtained by the applicable trustee, the holders of at least a majority in principal amount of outstanding debt securities of such series or of all debt securities then outstanding under the applicable indenture may rescind and annul such declaration and its consequences if:

The indentures provide that holders of debt securities of any series may not institute any proceedings, judicial or otherwise, with respect to such indenture or for any remedy under the indenture, unless the trustee fails to act for a period of 90 days after the trustee has received a written request to institute proceedings in respect of an event of default from the holders of 25% or more in principal amount of the outstanding debt securities of such series, as well as an offer of indemnity reasonably satisfactory to the trustee.

However, this provision will not prevent any holder of debt securities from instituting suit for the enforcement of payment of the principal of, and any premium, and interest on, such debt securities at the respective due dates thereof.

The indentures provide that, subject to provisions in each indenture relating to its duties in the case of a default, a trustee has no obligation to exercise any of its rights or powers at the request or direction of any holders of any series of debt securities then outstanding under the indenture, unless the holders have offered to the trustee reasonable security or indemnity. The holders of at least a majority in principal amount of the outstanding debt securities of any series or of all debt securities then outstanding under an indenture shall have the right to direct the time, method and place of conducting any proceeding for any remedy available to the applicable trustee, or of exercising any trust or power conferred upon such trustee. However, a trustee may refuse to follow any direction which:

Within 120 days after the close of each fiscal year, we will be required to deliver to each trustee a certificate, signed by one of our several specified officers, stating whether or not that officer has knowledge of any default under the applicable indenture. If the officer has knowledge of any default, the notice must specify the nature and status of the default.

Modification of the Indentures

Subject to certain exceptions, the indentures may be amended with the consent of the holders of a majority in aggregate principal amount of the outstanding debt securities of all series affected by such amendment (including consents obtained in connection with a tender offer or exchange for the debt securities of such series).

We and the applicable trustee may make modifications and amendments of an indenture without the consent of any holder of debt securities for any of the following purposes:

Subordination

Payment by us of the principal of, premium, if any, and interest on any series of subordinated debt securities issued under the subordinated indenture will be subordinated to the extent set forth in an indenture supplemental to the subordinated indenture relating to such series.

Discharge, Defeasance and Covenant Defeasance

Unless otherwise provided in the applicable prospectus supplement, the indentures allow us to discharge our obligations to holders of any series of debt securities issued under any indenture when:

Unless otherwise provided in the applicable prospectus supplement, the indentures provide that, upon our irrevocable deposit with the applicable trustee, in trust, of an amount, in such currency or currencies in which such debt securities are payable at stated maturity, or government obligations, or both, applicable to such debt securities, which through the scheduled payment of principal and interest in accordance with their terms will provide money in an amount sufficient to pay the principal of, and any premium or make-whole amount, and interest on, such debt securities, and any mandatory sinking fund or analogous payments thereon, on the scheduled due dates therefor, the issuing company shall be released from its obligations with respect to such debt securities under the applicable indenture or, if provided in the applicable prospectus supplement, its obligations with respect to any other covenant, and any omission to comply with such obligations shall not constitute an event of default with respect to such debt securities.

The applicable prospectus supplement may further describe the provisions, if any, permitting such defeasance or covenant defeasance, including any modifications to the provisions described above, with respect to the debt securities of or within a particular series.

No Individual Liability of Incorporators, Stockholders, Officers or Directors

The indentures provide that no incorporator and no past, present or future stockholder, officer or director, of us or any successor corporation in their capacity as such shall have any individual liability for any of our obligations, covenants or agreements under the debt securities or the indentures.

Governing Law

The indentures and the debt securities will be governed by and construed in accordance with the laws of the State of New York, except to the extent that the Trust Indenture Act is applicable.

Description of Depositary Shares

We may offer depositary receipts representing fractional shares of our preferred stock, rather than full shares of preferred stock. The shares of preferred stock represented by depositary shares will be deposited under a depositary agreement between us and a bank or trust company that meets certain requirements and is selected by us. Each owner of a depositary share will be entitled to all the rights and preferences of the preferred stock represented by the depositary share.

The description in an accompanying prospectus supplement of any depositary shares we offer will not necessarily be complete and will be qualified in its entirety by reference to the applicable depositary agreement, which will be filed with the SEC if we offer depositary shares. For more information on how you can obtain copies of any depositary agreement if we offer depositary shares, see “Where You Can Find More Information.” We urge you to read the applicable depositary agreement and any accompanying prospectus supplement in their entirety.

Description Of Warrants

We may issue warrants to purchase our debt or equity securities or securities of third parties or other rights, including rights to receive payment in cash or securities based on the value, rate or price of one or more specified commodities, currencies, securities or indices, or any combination of the foregoing. Warrants may be issued independently or together with any other securities and may be attached to, or separate from, such securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between us and a warrant agent. The terms of any warrants to be issued and a description of the material provisions of the applicable warrant agreement will be set forth in the applicable prospectus supplement.

The applicable prospectus supplement will describe the following terms of any warrants in respect of which this prospectus supplement is being delivered:

Description of Purchase Contracts

As specified in the applicable prospectus supplement, we may issue purchase contracts for the purchase or sale of:

Each purchase contract will entitle the holder thereof to purchase or sell, and obligate us to sell or purchase, on specified dates, such securities, currencies or commodities at a specified purchase price, which may be based on a formula, all as set forth in the applicable prospectus supplement. We may, however, satisfy our obligations, if any, with respect to any purchase contract by delivering the cash value of such purchase contract or the cash value of the property otherwise deliverable or, in the case of purchase contracts on underlying currencies, by delivering the underlying currencies, as set forth in the applicable prospectus supplement. The applicable prospectus supplement will also specify the methods by which the holders may purchase or sell such securities, currencies or commodities and any acceleration, cancellation or termination provisions or other provisions relating to the settlement of a purchase contract.

The purchase contracts may require us to make periodic payments to the holders thereof or vice versa, which payments may be deferred to the extent set forth in the applicable prospectus supplement, and those payments may be unsecured or prefunded on some basis. The purchase contracts may require the holders thereof to secure their obligations in a specified manner to be described in the applicable prospectus supplement. Alternatively, purchase contracts may require holders to satisfy their obligations thereunder when the purchase contracts are issued. Our obligation to settle such pre-paid purchase contracts on the relevant settlement date may constitute indebtedness.

Accordingly, pre-paid purchase contracts will be issued under either the senior indenture or the subordinated indenture.

Description of Units

As specified in the applicable prospectus supplement, we may issue units consisting of one or more shares of common stock, preferred shares, depositary shares representing preferred stock, debt securities, warrants, purchase contracts or any combination of such securities. The applicable supplement will describe:

Plan of Distribution

We are registering (1) the offer, issuance and sale by us of up to $1,000,000,000 in the aggregate of the securities identified herein from time to time in one or more offerings and (2) the issuance by us of up to 7,326,423 shares of Class A common stock issuable upon the redemption of 7,326,423 shares of IntermediateCo Class B common stock.

We are also registering the offer and sale from time to time by the Selling Holders, or their permitted transferees, of up to 92,398,994 shares of Class A common stock, consisting of (i) up to 66,322,571 shares of issued and outstanding shares of Class A common stock, (ii) 18,750,000 founder shares, subject to vesting requirements and (iii) 7,326,423 shares of Class A common stock issuable upon the redemption of 7,326,423 shares of IntermediateCo Class B common stock.

We will receive proceeds from the issuance and sale of our common stock, preferred stock, depositary shares representing preferred stock, debt securities, warrants, purchase contracts or units. We will pay any underwriting discounts and commissions and expenses incurred by us in connection with the sale of securities by us.

We are required to pay all fees and expenses incident to the registration of the shares of our common stock to be offered and sold pursuant to this prospectus supplement. The Selling Holders will bear all commissions and discounts, if any, attributable to their sale of shares of our common stock.

We will not receive any of the proceeds from the sale of the securities by the Selling Holders. The aggregate proceeds to the Selling Holders will be the purchase price of the securities less any discounts and commissions borne by the Selling Holders. The securities to be offered and sold by us covered by this prospectus supplement may be offered and sold from time to time. The shares of common stock beneficially owned by the Selling Holders covered by this prospectus supplement may be offered and sold from time to time by the Selling Holders. The term “Selling Holders” includes donees, pledgees, transferees or other successors in interest selling securities received after the date of this prospectus supplement from a Selling Holder as a gift, pledge, partnership distribution or other transfer. The Selling Holders will act independently of us in making decisions with respect to the timing, manner and size of each sale. Such sales may be made on one or more exchanges or in the over-the-counter market or otherwise, at prices and under terms then prevailing or at prices related to the then current market price or in negotiated transactions. We or the Selling Holders may use any one or more of the following methods when selling the securities offered by this prospectus supplement:

In addition, any shares that qualify for sale pursuant to Rule 144 may be sold under Rule 144 rather than pursuant to this prospectus supplement.

To the extent required, this prospectus supplement may be amended or supplemented from time to time to describe a specific plan of distribution. In connection with distributions of the shares or otherwise, the Selling Holders may enter into hedging transactions with broker-dealers or other financial institutions. In connection with such transactions, broker-dealers or other financial institutions may engage in short sales of shares of common stock in the course of hedging the positions they assume with Selling Holders. The Selling Holders may also sell shares of common stock short and redeliver the shares to close out such short positions. The Selling Holders may also enter into option or other transactions with broker-dealers or other financial institutions which require the delivery to such broker-dealer or other financial institution of shares offered by this prospectus supplement, which shares such broker-dealer or other financial institution may resell pursuant to this prospectus supplement (as supplemented or amended to reflect such transaction). The Selling Holders may also pledge shares to a broker-dealer or other financial institution, and, upon a default, such broker-dealer or other financial institution, may effect sales of the pledged shares pursuant to this prospectus supplement (as supplemented or amended to reflect such transaction).

In order to facilitate the offering of the securities, any underwriters or agents, as the case may be, involved in the offering of such securities may engage in transactions that stabilize, maintain or otherwise affect the price of our securities. Specifically, the underwriters or agents, as the case may be, may overallot in connection with the offering, creating a short position in our securities for their own account. In addition, to cover overallotments or to stabilize the price of our securities, the underwriters or agents, as the case may be, may bid for, and purchase, such securities in the open market. Finally, in any offering of securities through a syndicate of underwriters, the underwriting syndicate may reclaim selling concessions allotted to an underwriter or a broker-dealer for distributing such securities in the offering if the syndicate repurchases previously distributed securities in transactions to cover syndicate short positions, in stabilization transactions or otherwise. Any of these activities may stabilize or maintain the market price of the securities above independent market levels. The underwriters or agents, as the case may be, are not required to engage in these activities, and may end any of these activities at any time.

We and the Selling Holders may solicit offers to purchase the securities directly from, and may sell such securities directly to, institutional investors or others. In this case, no underwriters or agents would be involved. The terms of any of those sales, including the terms of any bidding or auction process, if utilized, will be described in the applicable prospectus supplement.

It is possible that one or more underwriters may make a market in our securities, but such underwriters will not be obligated to do so and may discontinue any market making at any time without notice. We cannot give any assurance as to the liquidity of the trading market for our securities. Our Class A common stock is listed on the NYSE under the symbol “MIR.”

We and the Selling Holders may authorize underwriters, broker-dealers or agents to solicit offers by certain purchasers to purchase the securities at the public offering price set forth in the prospectus supplement pursuant to delayed delivery contracts providing for payment and delivery on a specified date in the future. The contracts will be subject only to those conditions set forth in the prospectus supplement, and the prospectus supplement will set forth any commissions we or the Selling Holders pay for solicitation of these contracts.

A Selling Holder may enter into derivative transactions with third parties, or sell securities not covered by this prospectus supplement to third parties in privately negotiated transactions. If an applicable prospectus supplement indicates, in connection with those derivatives, the third parties may sell securities covered by this prospectus supplement, including in short sale transactions. If so, the third party may use securities pledged by any Selling Holder or borrowed from any Selling Holder or others to settle those sales or to close out any related open borrowings of stock, and may use securities received from any Selling Holder in settlement of those derivatives to close out any related open borrowings of stock. If applicable through securities laws, the third party in such sale transactions will be an underwriter and will be identified in the applicable prospectus supplement (or a post-effective amendment). In addition, any Selling Holder may otherwise loan or pledge securities to a financial institution or other third party that in turn may sell the securities short using this prospectus supplement. Such financial institution or other third party may transfer its economic short position to investors in our securities or in connection with a concurrent offering of other securities.

In effecting sales, broker-dealers or agents engaged by the Selling Holders may arrange for other broker-dealers to participate. Broker-dealers or agents may receive commissions, discounts or concessions from the Selling Holders in amounts to be negotiated immediately prior to the sale.

Underwriters, broker-dealers or agents may facilitate the marketing of an offering online directly or through one of their affiliates. In those cases, prospective investors may view offering terms and a prospectus online and, depending upon the particular underwriter, broker-dealer or agent, place orders online or through their financial advisors.

In offering the securities covered by this prospectus supplement, we, the Selling Holders and any underwriters, broker-dealers or agents who execute sales for the Selling Holders may be deemed to be “underwriters” within the meaning of the Securities Act in connection with such sales. Any discounts, commissions, concessions or profit they earn on any resale of those securities may be underwriting discounts and commissions under the Securities Act.

The underwriters, broker-dealers and agents may engage in transactions with us or the Selling Holders, may have banking, lending or other relationships with us or perform services for us or the Selling Holders, in the ordinary course of business.

In order to comply with the securities laws of certain states, if applicable, the securities must be sold in such jurisdictions only through registered or licensed brokers or dealers. In addition, in certain states the securities may not be sold unless they have been registered or qualified for sale in the applicable state or an exemption from the registration or qualification requirement is available and is complied with.

We have advised the Selling Holders that the anti-manipulation rules of Regulation M under the Exchange Act may apply to sales of securities in the market and to the activities of the Selling Holders and their affiliates. In addition, we will make copies of this prospectus supplement available to the Selling Holders for the purpose of satisfying the prospectus delivery requirements of the Securities Act. The Selling Holders may indemnify any broker-dealer that participates in transactions involving the sale of the shares against certain liabilities, including liabilities arising under the Securities Act.

At the time a particular offer of securities is made, if required, a prospectus supplement will be distributed that will set forth the number of securities being offered and the terms of the offering, including the name of any underwriter, dealer or agent, the purchase price paid by any underwriter, any discount, commission and other item constituting compensation, any discount, commission or concession allowed or reallowed or paid to any dealer, and the proposed selling price to the public.

Selling Holders

This prospectus supplement also relates to the resale by the Selling Holders of up to 92,398,994 shares of Class A common stock, from time to time, consisting of (i) 66,322,571 issued and outstanding shares of Class A common stock, (ii) 18,750,000 founder shares subject to vesting requirements and (iii) 7,326,423 shares of Class A common stock issuable upon the redemption of 7,326,423 shares of IntermediateCo Class B common stock. The Selling Holders may from time to time offer and sell any or all of the common stock set forth below pursuant to this prospectus supplement. When we refer to the “Selling Holders” in this prospectus supplement, we mean the persons listed in the table below, and their permitted transferees who later come to hold any of the Selling Holders’ interest in common stock in accordance with the terms of the agreements governing the registration rights applicable to such Selling Holder’s shares of common stock.

The Selling Holders acquired the shares of our common stock from us in private offerings pursuant to exemptions from registration under Section 4(a)(2) of the Securities Act in connection with a private placement concurrent with the IPO and in connection with the Business Combination. Pursuant to the RRA and the Subscription Agreements, we agreed to file a registration statement with the SEC for the purposes of registering for resale the shares of our Class A common stock issued to the Selling Holders pursuant to the Subscription Agreements and Business Combination Agreement.

The Selling Holders may from time to time offer and sell any or all of the shares of Class A common stock and units set forth below pursuant to this prospectus supplement. When we refer to the “Selling Holders” in this prospectus supplement, we mean the persons listed in the table below, and the pledgees, donees, transferees, assignees, successors and others who later come to hold any of the Selling Holders’ interest in the shares of Class A common stock and/or units after the date of this prospectus supplement such that registration rights shall apply to those securities.

The following table is prepared based on information provided to us by the Selling Holders. It sets forth the name and address of the Selling Holders, the aggregate number of shares of Class A common stock that the Selling Holders may offer pursuant to this prospectus supplement, and the beneficial ownership of the Selling Holders both before and after the offering. The Selling Holders may have sold, transferred or otherwise disposed of some or all of their shares of Class A common stock, or may have purchased additional freely-tradeable shares of Class A common stock since providing us with this information. We cannot advise you as to whether the Selling Holders will in fact sell any or all of their shares, and for purposes of this table, we have assumed that the Selling Holders will have sold all of the securities covered by this prospectus supplement. We have based percentage ownership after this offering on 200,102,086 shares of Class A common stock outstanding as of September 30, 2022.

We have determined beneficial ownership in accordance with the rules of the SEC. Except as indicated by the footnotes below, we believe, based on the information furnished to us, that the Selling Holders have sole voting and investment power with respect to all shares of common stock that they beneficially own, subject to applicable community property laws.

voting and investment control of the shares held by the Aleyska Selling Holder. Anand Parekh is the Chief Executive Officer of Alyeska Investment Group, L.P. and may be deemed to be the beneficial owner of such shares. Mr. Parekh, however, disclaims any beneficial ownership of the shares held by the Alyeska Selling Holder. The registered address of Alyeska Master Fund, L.P. is at c/o Maples Corporate Services Limited, P.O. Box 309, Ugland House, South Church Street George Town, Grand Cayman, KY1-1104, Cayman Islands. Alyeska Investment Group, L.P. is located at 77 W. Wacker, Suite 700, Chicago IL 60601.

committee members expressly disclaim beneficial ownership of all shares held by such funds and accounts. The address of such funds and accounts, such subsidiaries and such portfolio managers and/or investment committee members is 55 East 52nd Street, New York, NY 10055. Shares shown include only the securities being registered for resale and may not incorporate all shares deemed to be beneficially held by the registered holders or BlackRock, Inc.

Members of the Johnson family, including Abigail P. Johnson, are the predominant owners, directly or through trusts, of Series B voting common shares of FMR LLC, representing 49% of the voting power of FMR LLC. The Johnson family group and all other Series B shareholders have entered into a shareholders’ voting agreement under which all Series B voting common shares will be voted in accordance with the majority vote of Series B voting common shares. Accordingly, through their ownership of voting common shares and the execution of the shareholders’ voting agreement, members of the Johnson family may be deemed, under the Investment Company Act of 1940, to form a controlling group with respect to FMR LLC.

Neither FMR LLC nor Abigail P. Johnson has the sole power to vote or direct the voting of the shares owned directly by the various investment companies registered under the Investment Company Act (“Fidelity Funds”) advised by Fidelity Management & Research Company (“FMR Co”), a wholly owned subsidiary of FMR LLC, which power resides with the Fidelity Funds’ Boards of Trustees. Fidelity Management & Research Company carries out the voting of the shares under written guidelines established by the Fidelity Funds’ Boards of Trustees.

The address for Fidelity Concord Street Trust: Fidelity Large Cap Stock Fund is Mag & Co. c/o Brown Brothers Harriman & Co. Attn: Corporate Actions /Vault 140 Broadway New York, NY 10005.

Material United States Federal Income Tax Considerations

The following is a discussion of material United States federal income tax consequences of the ownership and disposition of our Class A common stock. This discussion applies only to shares of Class A common stock that are held as capital assets for U.S. federal income tax purposes and is applicable only to persons who are receiving our Class A common stock in this offering.

This discussion is a summary only and does not describe all of the tax consequences that may be relevant to you in light of your particular circumstances, including but not limited to the application of the alternative minimum tax and the Medicare tax on certain investment income and the different consequences that may apply if you are subject to special rules that apply to certain types of investors, including but not limited to:

If a partnership (including an entity or arrangement treated as a partnership for U.S. federal income tax purposes) or other pass-through entity holds our Class A common stock, the U.S. federal income tax treatment of a partner in such partnership or equityholder in such pass-through entity generally will depend upon the status of the

partner or equityholder, upon the activities of the partnership or other pass-through entity and upon certain determinations made at the partner or equityholder level. Accordingly, we urge partners in partnerships (including entities or arrangements treated as partnerships for U.S. federal income tax purposes) and equityholders in other pass-through entities considering the acquisition of our Class A common stock to consult their tax advisors regarding the U.S. federal income tax considerations of the ownership and disposition of our Class A common stock by such partnership or pass-through entity.

This discussion is based on the Code, and administrative pronouncements, judicial decisions and final, temporary and proposed Treasury regulations as of the date hereof, which are subject to change, possibly on a retroactive basis, and changes to any of which subsequent to the date of this prospectus supplement may affect the tax consequences described herein. This discussion does not address any aspect of state, local or non-U.S. taxation, or any U.S. federal taxes other than income taxes (such as gift and estate taxes). We have not sought, and will not seek, a ruling from the IRS as to any U.S. federal income tax consequence described herein. The IRS may disagree with the discussion herein, and its determination may be upheld by a court. Moreover, there can be no assurance that future legislation, regulations, administrative rulings or court decisions will not adversely affect the accuracy of the statements in this discussion.

THIS DISCUSSION OF U.S. FEDERAL INCOME TAX CONSIDERATIONS IS FOR GENERAL INFORMATION PURPOSES ONLY AND IS NOT TAX ADVICE. WE URGE PROSPECTIVE HOLDERS TO CONSULT THEIR TAX ADVISORS CONCERNING THE U.S. FEDERAL INCOME TAX CONSEQUENCES TO THEM OF OWNING AND DISPOSING OF OUR CLASS A COMMON STOCK, AS WELL AS THE APPLICATION OF ANY, STATE, LOCAL AND NON-U.S. INCOME, ESTATE AND OTHER TAX CONSIDERATIONS.

U.S. Holders

This section applies to you if you are a “U.S. holder.” As used herein, the term “U.S. holder” means a beneficial owner of our Class A common stock who or that is for U.S. federal income tax purposes:

Taxation of Distributions

If we pay distributions in cash or other property (other than certain distributions of our stock or rights to acquire our stock) to U.S. holders of shares of our Class A common stock, such distributions generally will constitute dividends for U.S. federal income tax purposes to the extent paid from our current or accumulated earnings and profits, as determined under U.S. federal income tax principles. Distributions in excess of our current and accumulated earnings and profits will constitute a return of capital that will be applied against and reduce (but not below zero) the U.S. holder’s adjusted tax basis in our Class A common stock. Any remaining excess will be treated as gain realized on the sale or other disposition of the Class A common stock and will be treated as described below under “—Gain or Loss on Sale, Taxable Exchange or Other Taxable Disposition of Class A Common Stock.” Dividends we pay to a U.S. holder that is a taxable corporation generally will qualify for the dividends received deduction if the requirements relating to the requisite holding period are satisfied. With certain exceptions, and provided certain holding period requirements are met, dividends we pay to a non- corporate U.S. holder generally will constitute “qualified dividends” that currently are subject to tax at preferential long-term capital gains rates.

Gain or Loss on Sale, Taxable Exchange or Other Taxable Disposition of Class A Common Stock

Upon a sale or other taxable disposition of our Class A common stock, a U.S. holder generally will recognize capital gain or loss in an amount equal to the difference between the amount realized and the U.S. holder’s adjusted tax basis in the Class A common stock. Any such capital gain or loss generally will be long-term capital gain or loss if the U.S. holder’s holding period for the Class A common stock exceeds one year. Long-term capital gains

recognized by non-corporate U.S. holders currently are eligible to be taxed at reduced rates. The deductibility of capital losses is subject to limitations.

Generally, the amount of gain or loss recognized by a U.S. holder is an amount equal to the difference between (i) the sum of the amount of cash and the fair market value of any property received in such disposition and (ii) the U.S. holder’s adjusted tax basis in its Class A common stock transferred in such disposition.

Information Reporting and Backup Withholding

In general, information reporting requirements may apply to dividends paid to a U.S. holder and to the proceeds of the sale or other disposition of our Class A common stock, unless the U.S. holder is an exempt recipient. Backup withholding may apply to such payments if the U.S. holder fails to provide a taxpayer identification number or a certification of exempt status or has been notified by the IRS that it is subject to backup withholding (and such notification has not been withdrawn).

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules will be allowed as a refund or a credit against a U.S. holder’s U.S. federal income tax liability provided the required information is timely furnished to the IRS.

All U.S. holders should consult their tax advisors regarding the application of information reporting and backup withholding to them.

Non-U.S. Holders

This section applies to you if you are a “Non-U.S. holder.” As used herein, the term “Non-U.S. holder” means a beneficial owner of our Class A common stock who or that is for U.S. federal income tax purposes:

but generally does not include an individual who is present in the United States for 183 days or more in the taxable year of disposition. If you are such an individual, you should consult your tax advisor regarding the U.S. federal income tax consequences of the acquisition, ownership or sale or other disposition of our Class A common stock.

Taxation of Distributions

In general, any distributions (other than certain distributions of our stock or rights to acquire our stock) made to a Non-U.S. holder of shares of our Class A common stock, to the extent paid out of our current or accumulated earnings and profits (as determined under U.S. federal income tax principles), will constitute dividends for U.S. federal income tax purposes. Provided such dividends are not effectively connected with the Non-U.S. holder’s conduct of a trade or business within the United States (and, under certain income tax treaties, not attributable to a U.S. permanent establishment or fixed base maintained by the Non-U.S. holder), we will be required to withhold tax from the gross amount of the dividend at a rate of thirty percent (30%), unless such Non-U.S. holder is eligible for a reduced rate of withholding tax under an applicable income tax treaty and provides proper certification of its eligibility for such reduced rate (usually on an IRS Form W-8BEN or W-8BEN-E). Any distribution not constituting a dividend will be treated first as reducing (but not below zero) the Non-U.S. holder’s adjusted tax basis in its Class A common stock and, to the extent such distribution exceeds the Non-U.S. holder’s adjusted tax basis, as gain realized from the sale or other disposition of our Class A common stock, which will be treated as described below under “Non-U.S. Holders-Gain or Loss on Sale, Taxable Exchange or Other Taxable Disposition of Class A Common Stock” below.

This withholding tax generally does not apply to dividends paid to a Non-U.S. holder who provides a Form W-8ECI certifying that the dividends are effectively connected with the Non-U.S. holder’s conduct of a trade or business within the United States. Instead, the effectively connected dividends will be subject to regular U.S. federal income tax as if the Non-U.S. holder were a U.S. resident, subject to an applicable income tax treaty providing otherwise. A corporate Non-U.S. holder receiving effectively connected dividends may also be subject to an additional “branch profits tax” imposed at a rate of 30% (or a lower applicable treaty rate).

Gain or Loss on Sale, Taxable Exchange or Other Taxable Disposition of Class A Common Stock

A Non-U.S. holder generally will not be subject to U.S. federal income or withholding tax in respect of gain recognized on a sale, taxable exchange or other taxable disposition of our Class A common stock, unless:

Unless an applicable treaty provides otherwise, gain described in the first bullet point above will be subject to tax at generally applicable U.S. federal income tax rates as if the Non-U.S. holder were a U.S. resident. Any gains described in the first bullet point above of a corporate Non-U.S. holder may also be subject to an additional “branch profits tax” at a thirty percent (30%) rate (or a lower applicable income tax treaty rate). If the second bullet point applies to a Non-U.S. holder, such Non-U.S. holder will be subject to U.S. tax on such Non-U.S. holder’s net capital gain for such year (which may be reduced by certain U.S. source capital losses) at a tax rate of thirty percent (30%).

If the third bullet point above applies to a Non-U.S. holder, gain recognized by such holder will be subject to tax at generally applicable U.S. federal income tax rates. In addition, a buyer may be required to withhold U.S. federal income tax at a rate of fifteen percent (15%) of the amount realized upon such disposition. We believe that we are not, and do not anticipate becoming, a United States real property holding corporation. However, such determination is factual in nature and subject to change and no assurance can be provided as to whether we would be treated as a United States real property holding corporation in any future year.

Information Reporting and Backup Withholding

Information returns will be filed with the IRS in connection with payments of dividends and the proceeds from a sale or other disposition of our Class A common stock. A Non-U.S. holder may have to comply with certification procedures to establish that it is not a United States person in order to avoid information reporting and backup withholding requirements. The certification procedures required to claim a reduced rate of withholding under a treaty generally will satisfy the certification requirements necessary to avoid the backup withholding as well.

Backup withholding is not an additional tax. The amount of any backup withholding from a payment to a Non-U.S. holder will be allowed as a credit against such holder’s U.S. federal income tax liability and may entitle such holder to a refund, provided that the required information is timely furnished to the IRS. All Non-U.S. holders should consult their tax advisors regarding the application of information reporting and backup withholding to them.

FATCA Withholding Taxes

Sections 1471 through 1474 of the Code and the Treasury regulations and administrative guidance promulgated thereunder (commonly referred to as the FATCA) generally impose withholding at a rate of thirty percent (30%) in certain circumstances on dividends in respect of our Class A common stock which are held by or through certain foreign financial institutions (including investment funds), unless any such institution (1) enters into, and complies with, an agreement with the IRS to report, on an annual basis, information with respect to interests in, and accounts maintained by, the institution that are owned by certain U.S. persons and by certain non-U.S. entities that are wholly or partially owned by U.S. persons and to withhold on certain payments, or (2) if required under an intergovernmental agreement between the United States and an applicable foreign country, reports such information to its local tax authority, which will exchange such information with the U.S. authorities. An intergovernmental agreement between the United States and an applicable foreign country may modify these requirements. Accordingly, the entity through which our Class A common stock are held will affect the determination of whether such withholding is required. Similarly, dividends in respect of our Class A common stock held by an investor that is a non-financial non-U.S. entity that does not qualify under certain exceptions will generally be subject to withholding at a rate of thirty percent (30%), unless such entity either (1) certifies to us or the applicable withholding agent that such entity does not have any “substantial United States owners” or (2) provides certain information regarding the entity’s “substantial United States owners,” which will in turn be provided to the U.S. Department of Treasury. All holders of Class A common stock should consult their tax advisors regarding the possible implications of FATCA on their ownership of our Class A common stock.

Legal Matters

The validity of any securities offered by this prospectus supplement will be passed upon for us by Goodwin Procter LLP, Redwood City, California.

Experts

The financial statements of Mirion Technologies, Inc. and subsidiaries as of December 31, 2021 (Successor), June 30, 2021 (Predecessor), and June 30, 2020 (Predecessor), and for the period from October 20, 2021 through December 31, 2021 (Successor), the period from July 1, 2021 through October 19, 2021 (Predecessor) and the three years ended June 30, 2021 (Predecessor), have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their report incorporated in this prospectus supplement by reference to the Annual Report on Form 10-K dated February 28, 2022. Such financial statements have been so incorporated in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.

The financial statements of Mirion Technologies, Inc. (f/k/a GS Acquisition Holdings Corp II) as of October 19, 2021 and December 31, 2020 and the period from January 1, 2021 to October 19, 2021, and for each of the two years in the period ended December 31, 2020 incorporated in this prospectus supplement by reference to the Current Report on Form 8- K dated November 17, 2022 have been so incorporated in reliance on the report of PricewaterhouseCoopers LLP, an independent registered accounting firm, given on the authority of said firm as experts in auditing and accounting.

Where You Can Find More Information

The SEC allows us to incorporate by reference information in this document. This means that we can disclose important information to you by referring you to another document filed separately with the SEC. The information incorporated by reference is considered to be part of this document, except for any information that is superseded by information that is included directly in this document.

We are incorporating by reference the filings listed below and any additional documents that we may file with the SEC pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act on or after the date hereof and prior to the termination of any offering (other than documents or information deemed to have been furnished and not filed in accordance with SEC rules):

Any statement contained in this prospectus supplement, or in a document incorporated or deemed to be incorporated by reference herein, shall be deemed to be modified or superseded to the extent that a statement contained herein, or in any subsequently filed document that also is incorporated or deemed to be incorporated by reference herein, modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus supplement.

The SEC maintains a website at www.sec.gov, from which you can inspect these documents and other information we have filed electronically with the SEC.

We will furnish without charge to each person, including any beneficial owner, to whom a prospectus is delivered, upon written or oral request, a copy of any or all of the documents incorporated by reference, including exhibits to these documents. Any such request may be made by writing or calling us at the following address or phone number:

Mirion Technologies, Inc
1218 Menlo Drive, Atlanta, Georgia 30318
Attention: Corporate Secretary
Telephone: (770) 432-2744

We also make copies of such documents available on our corporate website at www.mirion.com. Information contained on or accessible through our website is not a part of this prospectus supplement, and the inclusion of our website address in this prospectus supplement is an inactive textual reference only.