MBAC M3Brigade Acquisition II Corp

We believe that some of the information in this proxy statement constitutes forward-looking statements. You can identify these statements by forward-looking words such as “may,” “expect,” “anticipate,” “contemplate,” “believe,” “estimate,” “intends,” and “continue” or similar words. You should read statements that contain these words carefully because they:

We believe it is important to communicate our expectations to our stockholders. However, there may be events in the future that we are not able to predict accurately or over which we have no control. The cautionary language discussed in this proxy statement provide examples of risks, uncertainties and events that may cause actual results to differ materially from the expectations described by us in such forward-looking statements, including, among other things, claims by third parties against the trust account, unanticipated delays in the distribution of the funds from the trust account and the Company’s ability to finance and consummate a business combination following the distribution of funds from the trust account, and the Company’s ability to enter into a definitive agreement with any prospective target and consummate a business combination. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this proxy statement.

All forward-looking statements included herein attributable to the Company or any person acting on the Company’s behalf are expressly qualified in their entirety by the cautionary statements contained or referred to in this section. Except to the extent required by applicable laws and regulations, the Company undertakes no obligation to update these forward-looking statements to reflect events or circumstances after the date of this proxy statement or to reflect the occurrence of unanticipated events.

We are a blank check company whose business purpose is to effect a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or similar business combination with one or more businesses. We were incorporated in Delaware on December 16, 2020. On December 31, 2020, we issued an aggregate of 7,187,500 founder shares to the Sponsor in exchange for an aggregate capital contribution of $25,000. On February 11, 2021, we effected a share stock split, resulting in the Sponsor holding 8,625,000 founder shares. On February 19, 2021, we effected another share stock split, resulting in the Sponsor holding 11,500,000 founder shares. On March 3, 2021, the Sponsor transferred 25,000 founder shares to one of our directors.

On March 8, 2021, we consummated the IPO of 40,000,000 units. On April 19, 2021, the Sponsor forfeited 1,500,000 founder shares in connection with the determination by the underwriters of our IPO not to exercise in full the over-allotment option granted to them, resulting in our initial stockholders holding 10,000,000 founder shares. Each unit consists of one share of Class A common stock and one-third of one redeemable warrant, with each whole warrant entitling the holder thereof to purchase one share of Class A common stock for $11.50 per share. The units were sold at a price of $10.00 per unit, generating gross proceeds of $400,000,000. Simultaneously with the closing of the IPO, we consummated the sale of an aggregate of 7,500,000 private placement warrants at a price of $1.50 per warrant in a private placement to the Sponsor, generating gross proceeds to the Company of $11,250,000.

A total of $400,000,000 of the net proceeds from our initial public offering and the private placement with the Sponsor were deposited in a Trust Account established for the benefit of the Company’s public stockholders.

The Company entered into the Investment Management Trust Agreement, dated March 3, 2021, by and between the Company and Continental Stock Transfer & Trust Company in connection with the IPO and a potential business combination.

On August 16, 2021, the Company entered into an Agreement and Plan of Merger (the “Syniverse Merger Agreement”) with Blue Steel Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of the Company, and Syniverse. On February 9, 2022, the Company and Syniverse entered into a Mutual Written Consent of Termination, pursuant to which the parties agreed to terminate the Syniverse Merger Agreement effective as of February 9, 2022 due to unfavorable market conditions. Since the termination of the Syniverse Merger Agreement, the Company’s management has engaged two (2) proprietary deal sources (in addition to its existing relationships with the Company’s affiliates, M3 Capital Partners LLC, a Delaware limited liability company, and Brigade Capital Management, LP, a Delaware limited partnership) to source deals for the Company on a contingent fee basis. In addition, the Company regularly receives information for potential business combination opportunities from other unaffiliated sources, such as investment banks and target principals. Since the termination of the Syniverse Merger Agreement, the Company has entered into or is negotiating nondisclosure agreements with over twenty (20) potential business combination targets, has engaged in substantive discussions with at least five (5) potential business combination targets and has submitted letters indicating interest to three (3) business combination targets. Although the Company has not entered into a definitive agreement with any such potential business combination targets, the Company remains in active discussions with respect to some of such targets and continues to actively pursue opportunities for an attractive business combination.

As previously indicated, the Company completed its initial public offering in March 2021 and has operated as a blank check company searching for a target business with which to consummate an initial business combination since such time (or approximately 24 months). On March 30, 2022, the SEC issued proposed rules relating to, among other matters, the extent to which special purpose acquisition companies like ours could become subject to regulation under the Investment Company Act of 1940, as amended. The SEC’s proposed rules would provide a safe harbor for such companies from the definition of “investment company” under Section 3(a)(1)(A) of the Investment Company Act, provided that they satisfy certain conditions that limit a company’s duration, asset composition, business purpose and activities. The duration component of the proposed safe harbor rule would require the company to file a Current Report on Form 8-K with the SEC announcing that it has entered into an agreement with the target company (or companies) to engage in an initial business combination no later than 18 months after the effective date of the company’s registration statement for its initial public offering. The company would then be required to complete its initial business combination no later than 24 months after the effective date of its registration statement for its initial

public offering. The SEC has indicated that it believes that there are serious questions concerning the applicability of the Investment Company Act to special purpose acquisition companies, including a company like ours, that does not complete its initial business combination within the proposed time frame set forth in the proposed safe harbor rule. As a result, it is possible that a claim could be made in the future that we have been operating as an unregistered investment company. It is also possible that the investment of funds from the IPO during our life as a blank check company, and the earning and use of interest from such investment could increase the likelihood of us being found to have been operating as an unregistered investment company more than if we sought to potentially mitigate this risk by holding such funds as cash. If the Extension is implemented, the Company plans to maintain the remaining amount in its trust account in an interest bearing demand deposit account at a bank. Interest on such deposit account is variable and currently expected to be approximately 3.0% per annum. If the Company was deemed to be an investment company for purposes of the Investment Company Act and found to have been operating as an unregistered investment company, it could cause the Company to liquidate. If we are forced to liquidate, investors in the Company would not be able to participate in any benefits of owning stock in an operating business, including the potential appreciation of our stock following such a transaction and our warrants would expire worthless.

In addition, pursuant to the Inflation Reduction Act of 2022 (the “IR Act”), a 1% U.S. federal excise tax is imposed on certain repurchases (including redemptions) of stock by “covered corporations” occurring on or after January 1, 2023. Because we are a Delaware corporation and our securities are trading on the NYSE Stock Market, we are a “covered corporation” for this purpose. The excise tax is imposed on the covered corporation itself, not its shareholders from which shares are repurchased. The amount of the excise tax is generally 1% of the fair market value of the shares repurchased at the time of the repurchase. However, for purposes of calculating the excise tax, repurchasing corporations are permitted to net the fair market value of certain new stock issuances against the fair market value of stock repurchases during the same taxable year. In addition, certain exceptions apply to the excise tax. The U.S. Department of the Treasury (the “Treasury”) has been given authority to provide regulations and other guidance to carry out and prevent the abuse or avoidance of the excise tax. The Treasury recently issued interim guidance that redemptions in connection with a SPAC liquidation would not be subject to the excise tax under certain circumstances. In addition, redemptions that occur in the same taxable year as a liquidation is completed will also be exempt from such tax. Any share redemption or other share repurchase that occurs after December 31, 2022, in connection with a business combination, extension vote or otherwise, may be subject to the excise tax. The investment management trust agreement that governs the trust account provides that we may use accrued interest earned on the funds held in the trust account for any tax obligations, which would include any excise tax. Whether and to what extent the Company would be subject to the excise tax in connection with an initial business combination, extension vote or otherwise in the future will depend on a number of factors, including (i) the fair market value of the redemptions and repurchases in connection with the business combination, extension or otherwise, (ii) in the event of a business combination, the structure of such business combination, (iii) in the event of a business combination, the nature and amount of any “PIPE” or other equity issuances in connection with such business combination (or otherwise issued not in connection with such business combination but issued within the same taxable year of such business combination) and (iv) the content of regulations and other guidance from the Treasury. In the event that the Extension Proposal is approved and implemented as described in this proxy statement, funds in the Company’s trust account, including any interest earned thereon, will not be used to pay for any excise tax liabilities with respect to any redemptions that occur prior to or in connection with a business combination or liquidation of the Company. If the Company completes a business combination, because the excise tax would be payable by the Company (following the business combination) and not by the redeeming holder or out of the trust account, the payment of the excise tax would reduce cash available to the Company for ongoing operations following the completion of the business combination (and if the Company does not complete a business combination, the company would seek to obtain alternative funds if necessary to pay any excise tax incurred by the Company with respect to any redemptions).

The Company is proposing to extend the date by which the Company has to consummate a business combination to the Extended Date. The approval of the Extension Proposal is essential to the overall implementation of the board of directors’ plan to allow the Company more time to complete an initial business combination. Approval of the Extension Proposal is a condition to the implementation of the Extension. In addition, we will not proceed with the Extension if the number of redemptions of our public shares causes us to have less than $5,000,001 of net tangible assets following approval of the Extension.

All holders of the Company’s public shares, whether they vote for or against the Extension Proposal or do not vote at all, will be permitted to have all or a portion of their public shares redeemed for their pro rata portion of the trust account, provided that the Extension is implemented. Holders of public shares do not need to be a holder of record on the record date in order to exercise redemption rights.

The per share pro rata portion of the trust account on the record date (which is expected to be the same approximate amount two business days prior to the meeting) after taking into account taxes owed but not paid by such date was approximately $[  ]. The closing price of the Company’s common stock on the record date was $[  ]. Accordingly, if the market price were to remain the same until the date of the meeting, exercising redemption rights would result in a public stockholder receiving approximately $[  ] [more/less] than if the stockholder sold such shares in the open market. However, the actual market price on the redemption date may be higher or lower than the per share pro rata portion of the trust account on such date. Additionally, the Company cannot assure stockholders that they will be able to sell their shares in the open market, even if the market price per share is higher than the redemption price stated above, as there may not be sufficient liquidity in its securities when such stockholders wish to sell their shares.

The Company’s charter provides that the Company has until March 8, 2023 to complete a business combination (or, if the Office of the Delaware Division of Corporations shall not be open for business (including filing of corporate documents) on such date, the next date upon which the Office of the Delaware Division of Corporations shall be open) or such later date as approved by holders of a majority of the outstanding shares of Common Stock that are voted at a meeting to extend such date, voting together as a single class. The Company believes that given the Company’s expenditure of time, effort and money on searching for potential business combination opportunities, including with respect to our previously announced proposed transaction with Syniverse, which was later terminated, circumstances warrant providing public stockholders an opportunity to consider such initial business combination. However, there may not be sufficient time before March 8, 2023 to allow the Company to consummate such initial business combination. Accordingly, the Company has determined to seek stockholder approval to extend the time for closing a business combination beyond March 8, 2023 to the Extended Date. Our charter provides that the date by which the Company has to complete a business combination is extended by a shareholder vote, the holders of public shares shall be provided with the right to seek redemption of their public shares in connection therewith.

If the Extension Proposal is not approved (whether on the scheduled date for the special meeting or at an adjourned meeting upon approval of the Adjournment Proposal) and the Company is unable to consummate an initial business combination by March 8, 2023, the Extension will not be implemented and, in accordance with our charter, we expect to (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem 100% of the outstanding public shares, at a per share price, payable in cash, equal to the aggregate amount then on deposit in the trust account, including interest earned on the funds held in the trust account and not previously released to us to pay taxes (less up to $100,000 of interest to pay dissolution expenses), divided by the number of then outstanding public shares, which redemption will completely extinguish public stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of our remaining stockholders and our board of directors, dissolve and liquidate, subject (in the case of (ii) and (iii) above) to our obligations under Delaware law to provide for claims of creditors and the requirements of other applicable law.

The holders of the sponsor shares have waived their rights to participate in any liquidation distribution with respect to such shares. There will be no distribution from the trust account with respect to the Company’s warrants

which will expire worthless if the Extension Proposal is not approved and the Company is wound up. The Company will pay the costs of liquidation from its remaining assets outside of the trust account and the up to $100,000 of interest earned on the funds held in the trust account available to us for such purposes.

If the Extension Proposal is approved, the time the Company has to complete its business combination will be extended until the Extended Date. The Company intends to continue to attempt to consummate a business combination until the Extended Date. The Company will remain a reporting company under the Exchange Act and its units, common stock, and warrants will remain publicly traded during the extension period. The warrants will continue in existence in accordance with their terms.

You are not being asked to vote on any business combination at this time. If the Extension is implemented and you do not elect to redeem your public shares now, you will retain the right to vote on any proposed business combination when and if it is submitted to stockholders and the right to redeem your public shares for a pro rata portion of the trust account in the event the proposed business combination is approved and completed or if the Company has not consummated a business combination by the Extended Date.

If the Extension Proposal is approved, and the Extension is implemented, the removal of the Withdrawal Amount from the trust account will reduce the Company’s net asset value. The Company cannot predict the amount that will remain in the trust account if the Extension Proposal is approved, and the amount remaining in the trust account may be only a small fraction of the approximately $404 million that was in the trust account as of the record date. We will not proceed with the Extension if redemptions of public shares cause us to have less than $5,000,001 of net tangible assets following approval of the Extension.

If the Extension Proposal is approved, and the Extension is implemented, each public stockholder may seek to have his, her or its public shares redeemed for a pro rata portion of the funds available in the trust account, less any taxes we anticipate will be owed on such funds but have not yet been paid, calculated as of two business days prior to the special meeting. Holders of public shares do not need to vote on the Extension Proposal or be a holder of record on the record date to exercise redemption rights.

TO DEMAND REDEMPTION, YOU MUST EITHER PHYSICALLY TENDER YOUR STOCK CERTIFICATES TO CONTINENTAL STOCK TRANSFER & TRUST COMPANY, THE COMPANY’S TRANSFER AGENT, AT CONTINENTAL STOCK TRANSFER & TRUST COMPANY, 1 STATE STREET, NEW YORK, NEW YORK 10004, ATTN: MARK ZIMKIND, MZIMKIND@CONTINENTALSTOCK.COM, NO LATER THAN TWO BUSINESS DAYS PRIOR TO THE VOTE FOR THE EXTENSION PROPOSAL OR DELIVER YOUR SHARES TO THE TRANSFER AGENT ELECTRONICALLY NO LATER THAN TWO BUSINESS DAYS PRIOR TO THE VOTE FOR THE EXTENSION PROPOSAL USING THE DEPOSITORY TRUST COMPANY’S DWAC (DEPOSIT/WITHDRAWAL AT CUSTODIAN) SYSTEM. The requirement for physical or electronic delivery at least two business days prior to the vote at the special meeting ensures that a redeeming holder’s election is completed once the Extension Proposal is approved and the Extension is implemented. Accordingly, stockholders making the election will not be able to tender their shares after the date that is two business days prior to the vote at the special meeting.

The electronic delivery process through the DWAC system can be accomplished by the stockholder, whether or not it is a record holder or its shares are held in “street name,” by contacting the transfer agent or its broker and requesting delivery of its shares through the DWAC system. Delivering shares physically may take significantly longer. In order to obtain a physical stock certificate, a stockholder’s broker and/or clearing broker, DTC, and the Company’s transfer agent will need to act together to facilitate this request. There is a nominal cost associated with the above-referenced tendering process and the act of certificating the shares or delivering them through the DWAC system. The transfer agent will typically charge the tendering broker a nominal amount and the broker would determine whether or not to pass this cost on to the redeeming holder. It is the Company’s understanding that stockholders should generally allot at least two weeks to obtain physical certificates from the transfer agent. The Company does not have any control over this process or over the brokers or DTC, and it may take longer than two weeks to obtain a physical stock certificate. Such stockholders will have less time to make their investment decision than those stockholders that deliver their shares through the DWAC system. Stockholders who request physical stock certificates and wish to redeem may be unable to meet the deadline for tendering their shares before exercising their redemption rights and thus will be unable to redeem their shares.

Shares that have not been tendered in accordance with these procedures at least two business days prior to the vote for the Extension Proposal will not be redeemed for a pro rata portion of the funds held in the trust account. In the event that a public stockholder tenders its shares and decides prior to the vote at the special meeting (or after the special meeting but prior to effectuation of the Extension with the Company’s consent) that it does not want to redeem its shares, the stockholder may withdraw the tender. If you delivered your shares for redemption to our transfer agent and decide prior to the vote at the special meeting (or after the special meeting but prior to effectuation of the Extension with the Company’s consent) not to redeem your shares, you may request that our transfer agent return the shares (physically or electronically). You may make such request by contacting our transfer agent at the address listed above. In the event that a public stockholder tenders shares and the Extension Proposal is not approved or is abandoned, these shares will be redeemed in accordance with the terms of the charter promptly following the March 8, 2023 expiration date, as described elsewhere herein. The Company anticipates that a public stockholder who tenders shares for redemption in connection with the vote to approve the Extension Proposal would receive payment of the redemption price for such shares soon after the implementation of the Extension. The transfer agent will hold the certificates of public stockholders that make the election until such shares are redeemed for cash or redeemed in connection with our winding up.

If properly demanded, the Company will redeem each public share for a pro rata portion of the funds available in the trust account, less any taxes we anticipate will be owed on such funds but have not yet been paid, calculated as of two business days prior to the meeting. As of the record date, after taking into account taxes owed but not paid by such date, this would amount to approximately $[  ] per share (which is expected to be approximately the same amount as of two business days prior to the meeting). The closing price of the Company’s common stock on the record date was $[  ]. Accordingly, if the market price were to remain the same until the date of the meeting, exercising redemption rights would result in a public stockholder receiving approximately $[  ] [more/less] than if the stockholder sold such shares in the open market. However, the actual market price on the redemption date may be higher or lower than the per share pro rata portion of the trust account on such date.

If you exercise your redemption rights, you will be exchanging your shares of common stock of the Company for cash and will no longer own the shares. You will be entitled to receive cash for these shares only if you properly demand redemption by tendering your shares to the Company’s transfer agent two business days prior to the vote for the Extension Proposal. If the Extension Proposal is not approved or if it is abandoned, these shares will be redeemed in accordance with the terms of the charter promptly following the March 8, 2023 expiration date as described elsewhere herein.

The following is a discussion of certain material U.S. federal income tax considerations for U.S. holders and Non-U.S. holders (each as defined below) of public shares of the Redemption. This discussion applies only to U.S. holders and Non-U.S. holders that hold public shares as “capital assets” within the meaning of Section 1221 of the Code (generally, property held for investment). This discussion is based on provisions of the Code, Treasury Regulations promulgated thereunder (“Treasury Regulations”), rulings and other published positions of the Internal Revenue Service (the “IRS”) and judicial decisions, all as in effect as of the date hereof, and all of which are subject to change and differing interpretations, possibly with retroactive effect. Any such change or differing interpretation could affect the accuracy of the statements and conclusions set forth in this discussion. No assurance can be given that the IRS would not assert, or that a court would not sustain, a position contrary to any of the tax considerations described in this discussion. No advance ruling has been or will be sought from the IRS regarding any matter discussed below.

This discussion is for general information purposes only and does not purport to be a complete analysis of all of the U.S. federal income tax considerations that may be relevant to particular holders in light of their particular facts and circumstances, or to holders subject to special rules under the U.S. federal income tax laws, including, for example, but not limited to:

This discussion does not address any U.S. federal tax considerations other than those pertaining to the income tax (such as estate, gift or other non-income tax considerations) or any state, local or foreign income or non-income tax considerations. In addition, this discussion does not address any considerations arising under the unearned income Medicare contribution tax, or any considerations in respect of any withholding required pursuant to the Foreign Account Tax Compliance Act of 2010 (including the Treasury Regulations promulgated thereunder and intergovernmental agreements entered into in connection therewith and any laws, regulations or practices adopted in connection with any such agreement).

If a partnership (or other entity or arrangement classified as a partnership for U.S. federal income tax purposes) holds public shares, the U.S. federal income tax treatment of the partners in the partnership generally will depend upon the status of the partner, the activities of the partner and the partnership and certain determinations made at the partner level. Accordingly, partnerships and partners in partnerships holding public shares should consult their tax advisors as to the particular tax consequences to them of the Redemption.

THE U.S. FEDERAL INCOME TAX TREATMENT OF THE REDEMPTION TO ANY PARTICULAR STOCKHOLDER WILL DEPEND ON THE STOCKHOLDER’S PARTICULAR TAX CIRCUMSTANCES. YOU ARE URGED TO CONSULT YOUR TAX ADVISOR REGARDING THE U.S. FEDERAL, STATE, LOCAL AND NON-U.S. INCOME AND OTHER TAX CONSEQUENCES TO YOU OF THE REDEMPTION IN LIGHT OF YOUR PARTICULAR INVESTMENT OR TAX CIRCUMSTANCES.

A public stockholder that does not elect to redeem its public shares if the Extension Proposal is approved and the Extension is implemented will continue to own its public shares, and will not recognize any income, gain or loss for U.S. federal income tax purposes solely as a result of the Extension Proposal.

In the event that a holder’s public shares are redeemed pursuant to the redemption provisions described in this proxy statement under the section entitled “The Extension Proposal — Redemption Rights,” the treatment of the redemption for U.S. federal income tax purposes will depend on whether the redemption qualifies as a sale of public shares under Section 302 of the Code. If the redemption qualifies as a sale of public shares, the material U.S. federal

income tax consequences to a U.S. holder (as defined below) generally will be as described below under the section entitled “U.S. Holders — Taxation of Redemption Treated as a Sale of Public Shares,” and the material U.S. federal income tax consequences to a Non-U.S. holder (as defined below) generally will be as described under the section entitled “Non-U.S. Holders — Taxation of Redemption Treated as a Sale of Public Shares.” If the redemption does not qualify as a sale of public shares under Section 302 of the Code, a holder generally will be treated as receiving a corporate distribution with the material U.S. federal income tax consequences to a U.S. holder generally as described below under the section entitled “U.S. Holders — Taxation of Redemption Treated as a Distribution,” and the material U.S. federal income tax consequences to a Non-U.S. holder generally as described below under the section entitled “Non-U.S. Holders — Taxation of Redemption Treated as a Distribution.”

Whether a redemption of a holder’s public shares qualifies for sale treatment will depend largely on the total number of shares of our stock treated as held, directly, indirectly or constructively, by such redeemed holder before and after the redemption (including any stock treated as held by such holder under applicable constructive ownership rules, including any stock constructively owned by the holder as a result of owning public warrants) relative to all of our shares outstanding both before and after the redemption. The redemption of a holder’s public shares generally will be treated as a sale of public shares by such holder (rather than as a corporate distribution) under Section 302 of the Code if the redemption: (i) is “substantially disproportionate” with respect to the holder; (ii) results in a “complete termination” of the holder’s interest in us; or (iii) is “not essentially equivalent to a dividend” with respect to the holder. These tests are explained more fully below.

In determining whether any of the foregoing tests result in a redemption qualifying for sale treatment, a holder takes into account not only shares of our stock actually owned by the holder, but also shares of our stock that are constructively owned by the holder under certain attribution rules set forth in the Code. Among other things, a holder may constructively own, in addition to stock owned directly, stock owned by certain related individuals and entities in which the holder has an interest or that have an interest in such holder, as well as any stock that the holder has a right to acquire pursuant to the exercise of an option, which would generally include public shares that could be acquired pursuant to the exercise of the public warrants. In order to meet the substantially disproportionate test, the percentage of our outstanding voting stock actually and constructively owned by the holder immediately following the redemption of such holder’s public shares must, among other requirements, be less than 80% of the percentage of our outstanding voting stock actually and constructively owned by the holder immediately before the redemption (taking into account redemptions by other holders of public shares). There will be a complete termination of a holder’s interest if either (i) all of the shares of our stock actually and constructively owned by the holder are redeemed or (ii) all of the shares of our stock actually owned by the holder are redeemed and the holder is eligible to waive, and effectively waives in accordance with specific rules, the attribution of stock owned by certain family members and the holder does not constructively own any other stock. The redemption of public shares will not be essentially equivalent to a dividend if the redemption results in a “meaningful reduction” of the holder’s proportionate interest in us. Whether the redemption will result in a meaningful reduction in a holder’s proportionate interest in us will depend on the particular facts and circumstances. However, the IRS has indicated in a published ruling that even a small reduction in the proportionate interest of a small minority stockholder in a publicly held corporation who exercises no control over corporate affairs may constitute such a “meaningful reduction.”

If none of the foregoing tests is satisfied, then the redemption of a holder’s public shares will be treated as a corporate distribution to the redeemed holder and the material U.S. federal income tax consequences of the redemption to such holder that is a U.S. holder generally will be as described below under the section entitled “U.S. Holders — Taxation of Redemption Treated as a Distribution,” and the material U.S. federal income tax consequences of the redemption to such holder that is a Non-U.S. holder generally will be as described below under the section entitled “Non-U.S. Holders — Taxation of Redemption Treated as a Distribution.” After the application of those rules, any remaining tax basis of the holder in the redeemed public shares will be added to the holder’s adjusted tax basis in its remaining shares of our stock, or, if it has none, to the holder’s adjusted tax basis in its public warrants or possibly in other shares of our stock constructively owned by it.

A holder of public shares should consult its tax advisors as to the tax consequences of a redemption.

This section applies to “U.S. holders.” For purposes of this discussion, a “U.S. holder” means a beneficial owner of public shares that is, for U.S. federal income tax purposes:

If the redemption of a U.S. holder’s public shares is treated as a distribution, as discussed above under the section entitled “Tax Treatment of Redeeming Stockholders,” such a distribution generally will constitute a dividend 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 first applied against and reduce (but not below zero) the U.S. holder’s adjusted tax basis in its public shares. Any remaining excess will be treated as gain recognized on the sale or other taxable disposition of the public shares and will be treated as described below under the section entitled “U.S. Holders — Taxation of Redemption Treated as a Sale of Public Shares.”

Dividends paid to a U.S. holder that is a taxable corporation generally will qualify for the dividends received deduction if the requisite holding period is satisfied. With certain exceptions, and provided certain holding period requirements are met, dividends paid to a non-corporate U.S. holder generally will constitute “qualified dividends” that will be subject to tax at the maximum tax rate applicable to long-term capital gains. It is unclear whether the redemption rights with respect to our public shares may prevent a U.S. holder from satisfying the applicable holding period requirements with respect to the dividends received deduction or the preferential tax rate on qualified dividend income, as the case may be.

If the redemption of a U.S. holder’s public shares is treated as a sale, as discussed above under the section entitled “Tax Treatment of Redeeming Stockholders,” a U.S. holder generally will recognize capital gain or loss in an amount equal to the difference between the amount of cash received and the U.S. holder’s adjusted tax basis in the public shares redeemed. 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 public shares so disposed of exceeds one year. It is unclear, however, whether the redemption rights with respect to the public shares may suspend the running of the applicable holding period for this purpose. Long-term capital gains recognized by non-corporate U.S. holders are generally eligible to be taxed at preferential rates. The deductibility of capital losses is subject to limitations. U.S. holders who hold different blocks of public shares (public shares purchased or acquired on different dates or at different prices) should consult their tax advisors to determine how the above rules apply to them.

This section applies to “Non-U.S. holders.” For purposes of this discussion, a “Non-U.S. holder” means a beneficial owner of public shares that is neither a U.S. holder nor an entity or arrangement treated as a partnership for U.S. federal income tax purposes.

If the redemption of a Non-U.S. holder’s public shares is treated as a distribution, as discussed above under the section entitled “Tax Treatment of Redeeming Stockholders,” such a distribution generally will constitute a dividend for U.S. federal income tax purposes to the extent paid out of our current or accumulated earnings and profits (as determined under U.S. federal income tax principles). Unless such dividend is effectively connected with the

Non-U.S. holder’s conduct of a trade or business within the United States (and, if required by an applicable income tax treaty, is attributable to a U.S. permanent establishment or fixed base maintained by the Non-U.S. holder), the gross amount of such dividend will generally be subject to withholding tax at a rate of 30%, unless such Non-U.S. holder is eligible for a reduced rate of withholding tax under an applicable income tax treaty and timely provides proper certification of its eligibility for such reduced rate (usually on an IRS Form W-8BEN or W-8BEN-E). Distributions in excess of our current and accumulated earnings and profits will constitute a return of capital that will be first applied against and reduce (but not below zero) the Non-U.S. holder’s adjusted tax basis in its public shares. Any remaining excess will be treated as gain recognized on the sale or other taxable disposition of the public shares and will be treated as described below under the section entitled “Non-U.S. Holders — Taxation of Redemption Treated as a Sale of Public Shares.”

The withholding tax described above does not apply to dividends paid to a Non-U.S. holder that are effectively connected with the Non-U.S. holder’s conduct of a trade or business within the United States (and, if required by an applicable income tax treaty, are attributable to a U.S. permanent establishment or fixed base maintained by the Non-U.S. holder), provided that the holder provides the applicable withholding agent with a properly completed and executed IRS Form W-8ECI and satisfies all applicable certification requirements. Instead, such 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 Non-U.S. holder that is a corporation for U.S. federal income tax purposes may also be subject to an additional “branch profits tax” imposed at a rate of 30% (or such lower rate specified by an applicable income tax treaty) on its “effectively connected earnings and profits” for the taxable year, as adjusted for certain items.

If the redemption of a Non-U.S. holder’s public shares is treated as a sale, as discussed above under the section entitled “Tax Treatment of Redeeming Stockholders,” subject to the discussion regarding backup withholding below, a Non-U.S. holder generally will not be subject to U.S. federal income or withholding tax in respect of gain recognized in connection with such redemption, unless:

Unless an applicable treaty provides otherwise, gain described in the first bullet point above generally 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. A Non-U.S. holder that is a corporation for U.S. federal income tax purposes may also be subject to an additional “branch profits tax” at a 30% rate (or such lower rate specified by an applicable income tax treaty) on its “effectively connected earnings and profits” for the taxable year, as adjusted for certain items.

Gain described in the second bullet point above generally will be subject to U.S. federal income tax at a rate of 30% (or such lower rate specified by an applicable income tax treaty), which generally may be offset by U.S. source capital losses of the Non-U.S. holder, provided the Non-U.S. holder has timely filed U.S. federal income tax returns with respect to such losses.

If the third bullet point above applies to a Non-U.S. holder, gain recognized by such holder in connection with a redemption treated as a sale will be subject to tax at generally applicable U.S. federal income tax rates. In addition, unless our public shares are regularly traded on an established securities market within the meaning of applicable Treasury Regulations, we may be required to withhold U.S. federal income tax at a rate of 15% of the amount realized upon such redemption. There can be no assurance that our public shares will be treated as regularly traded on an established securities market. However, we believe that we are not and have not been at any time since our formation

a United States real property holding corporation and we do not expect to be a United States real property holding corporation in the immediate foreseeable future, but there can be no assurance in this regard. Holders should consult their tax advisor regarding the tax consequences to them if we are treated as a U.S. real property holding corporation.

It is possible that because an applicable withholding agent may not be able to determine the proper characterization of a redemption of a Non-U.S. Holder’s public shares, such applicable withholding agent might treat the redemption as a distribution subject to withholding tax.

Generally, information reporting requirements may apply in connection with payments made to U.S. holders or Non-U.S. holders in connection with a redemption of public shares.

Backup withholding of tax (currently at a rate of 24%) generally will apply to cash payments to which a U.S. holder is entitled in connection with a redemption of public shares, unless the U.S. holder provides the applicable withholding agent with a properly completed and executed IRS Form W-9 providing such U.S. holder’s correct taxpayer identification number and certifying that such holder is not subject to backup withholding, or otherwise establishes an exemption. Backup withholding of tax may also apply to cash payments to which a Non-U.S. holder is entitled in connection with the Redemption, unless the Non-U.S. holder provides the applicable withholding agent with a properly completed and executed IRS Form W-8BEN or IRS Form W-8BEN-E (or other applicable IRS Form W-8), attesting to such Non-U.S. holder’s status as non-U.S. person and otherwise complies with applicable certification requirements.

Backup withholding is not an additional tax. The amount of any backup withholding from a payment to a U.S. holder or Non-U.S. holder generally will be allowed as a credit against such holder’s U.S. federal income tax liability, if any, and may entitle such holder to a refund, provided that the required information is timely furnished to the IRS.

THE DISCUSSION ABOVE IS BASED ON CURRENT LAW. LEGISLATIVE, ADMINISTRATIVE OR JUDICIAL CHANGES OR INTERPRETATIONS, WHICH CAN APPLY RETROACTIVELY, COULD AFFECT THE ACCURACY OF THE STATEMENTS SET FORTH THEREIN. THIS DISCUSSION IS FOR GENERAL INFORMATION PURPOSES ONLY. IT DOES NOT ADDRESS TAX CONSIDERATIONS THAT MAY VARY WITH, OR ARE CONTINGENT ON, A HOLDER’S INDIVIDUAL CIRCUMSTANCES NOR THE APPLICATION OF ANY U.S. NON-INCOME TAX LAWS OR THE LAWS OF ANY STATE, LOCAL OR NON-U.S. JURISDICTION. HOLDERS ARE URGED TO CONSULT THEIR TAX ADVISORS REGARDING SUCH MATTERS AND THE TAX CONSEQUENCES OF THE REDEMPTION TO THEM IN LIGHT OF THEIR PARTICULAR CIRCUMSTANCES.

The board of directors recommends that stockholders vote “FOR” the approval of the Extension Proposal.

The Company is proposing the Adjournment Proposal to allow the Company to adjourn the special meeting to a later date or dates to give the Company more time to effectuate the Extension for whatever reason, including to provide additional time to seek approval of the Extension Proposal.

If the Adjournment Proposal is presented to the special meeting and is not approved by the stockholders, the Company may not be able to adjourn the special meeting to a later date or dates if necessary. In such event, the Extension may not be effectuated.

The board of directors recommends that stockholders vote “FOR” the approval of the Adjournment Proposal.

Date, Time and Place. The special meeting of the Company’s stockholders will be held at 9:00 a.m. EDT on March 7, 2023, virtually at http://www.virtualshareholdermeeting.com/MBAC2023SM.

Voting Power; Record Date. You will be entitled to vote or direct votes to be cast at the special meeting, if you owned Company common stock at the close of business on February 21, 2023, the record date for the special meeting. At the close of business on the record date, there were 50,000,000 shares of common stock outstanding, each of which entitles its holder to cast one vote per proposal. Company warrants do not carry voting rights.

Proxies; Board Solicitation. Your proxy is being solicited by the Company’s board of directors on the proposals being presented to stockholders at the special meeting. No recommendation is being made as to whether you should elect to redeem your shares. Proxies may be solicited in person or by telephone. If you grant a proxy, you may still revoke your proxy and vote your shares virtually at the special meeting. Innisfree M&A Incorporated is assisting the Company in the proxy solicitation process for this special meeting. The Company will pay that firm a [  ] fee plus disbursements for such services at the closing of any proposed business combination.

Extension Proposal. Approval of the Extension Proposal will require the affirmative vote of stockholders holding a majority of the total shares of common stock that are voted at the special meeting. Abstentions and broker non-votes will have the same effect as votes against the Extension Proposal. On the record date, the 10,000,000 sponsor shares represented 20.0% of the Company’s issued and outstanding common stock. The sponsor and all of the Company’s directors, executive officers and their affiliates, are expected to vote any shares of common stock owned by them in favor of the proposals.

Adjournment Proposal. Approval of the Adjournment Proposal will require the affirmative vote of the holders of a majority of the shares of the Company’s common stock represented in person (including virtually) or by proxy at the meeting and entitled to vote on such proposal. Abstentions will have the same effect as a vote against the Adjournment Proposal. Brokers are entitled to vote on the Adjournment Proposal absent voting instructions from the beneficial holder because the proposal is considered “routine”. Consequently, there should be no broker non-votes with respect to the Adjournment Proposal.

Subject to applicable securities laws (including with respect to material nonpublic information), the sponsor, the Company’s directors, officers, advisors or any of their respective affiliates may (i) purchase public shares from institutional and other investors (including those who vote, or indicate an intention to vote, against any of the proposals presented at the special meeting, or elect to redeem, or indicate an intention to redeem, public shares), (ii) enter into transactions with such investors and others to provide them with incentives to not redeem their public shares, or (iii) execute agreements to purchase such public shares from such investors or enter into non-redemption agreements in the future. In the event that the sponsor, the Company’s directors, officers, advisors or any of their respective affiliates purchase public shares in situations in which the tender offer rules restrictions on purchases would apply, they (a) would purchase the public shares at a price no higher than the price offered through the Company’s redemption process; (b) would represent in writing that such public shares will not be voted in favor of approving the Extension; and (c) would waive in writing any redemption rights with respect to the public shares so purchased.

To the extent any such purchases by the sponsor, the Company’s directors, officers, advisors or any of their respective affiliates are made in situations in which the tender offer rules restrictions on purchases apply, the Company will disclose in a Current Report on Form 8-K prior to the special meeting the following: (i) the number of public shares purchased outside of the redemption offer, along with the purchase price(s) for such public shares; (ii) the purpose of any such purchases; (iii) the impact, if any, of the purchases on the likelihood that the Extension will be approved; (iv) the identities of the securityholders who sold to the Sponsors, the Company’s directors, officers, advisors or any of their respective affiliates (if not purchased on the open market) or the nature of the securityholders (e.g., 5% security holders) who sold such public shares; and (v) the number of common shares for which the Company has received redemption requests pursuant to its redemption offer.

The purpose of such share purchases and other transactions would be to increase the likelihood of (i) otherwise limiting the number of public shares electing to redeem and (ii) the Company’s net tangible assets (as determined in accordance with Rule 3a51(g)(l) of the Exchange Act) being at least $5,000,001.

If such transactions are effected, the consequence could be to cause the Extension to be effectuated in circumstances where such effectuation could not otherwise occur. Consistent with SEC guidance, purchases of shares by the persons described above would not be permitted to be voted for the Extension at the special meeting and could decrease the chances that the Extension would be approved. In addition, if such purchases are made, the public “float” of our securities and the number of beneficial holders of our securities may be reduced, possibly making it difficult to maintain or obtain the quotation, listing or trading of our securities on a national securities exchange.

The Company hereby represents that any Company securities purchased by the sponsor, the Company’s directors, officers, advisors or any of their respective affiliates in situations in which the tender offer rules restrictions on purchases would apply would not be voted in favor of approving the Extension Proposal.

When you consider the recommendation of the Company’s board of directors, you should keep in mind that the Company’s executive officers and members of the Company’s board of directors have interests that may be different from, or in addition to, your interests as a stockholder. These interests include, among other things:

Additionally, if the Extension Proposal is approved and the Extension is implemented and the Company consummates an initial business combination, the officers and directors may have additional interests that would be described in the proxy statement for such transaction.

THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT YOU VOTE “FOR” THE EXTENSION PROPOSAL AND “FOR” THE ADJOURNMENT PROPOSAL, IF PRESENTED. THE BOARD OF DIRECTORS EXPRESSES NO OPINION AS TO WHETHER YOU SHOULD REDEEM YOUR PUBLIC SHARES.