Meridian3 Industrials Acquisition Corp

As filed with the U.S. Securities and Exchange Commission on June 4, 2026.

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM****S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

MERIDIAN3 Industrials Acquisition Corp

(Exact name of registrant as specified in its charter)

1330 Avenue of the Americas

Suite 23A

New York, NY 10019

Tel: +1 (212) 653 0982

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Jeffrey H. Foster

Chief Financial Officer

1330 Avenue of the Americas

Suite 23A

New York, NY 10019

Tel: +1 (212) 653 0982

(Name, address, including zip code, and telephone number, including area code, of agent for service)

**Approximate date of commencement of proposed sale to the public:**As soon as practicable after the effective date of this registration statement.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933 check the following box.☐

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.☐

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.☐

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.☐

The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until this Registration Statement shall become effective on such date as the U.S. Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

The information in this preliminary prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This preliminary prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

$175,000,000

17,500,000 Units

Meridian3 Industrials Acquisition Corp is a blank check company incorporated as a Cayman Islands exempted company and incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses or entities, which we refer to throughout this prospectus as our initial business combination. We have not selected any specific business combination target and we have not, nor has anyone on our behalf, initiated any substantive discussions, directly or indirectly, with any business combination target. We may pursue an initial business combination in any business or industry but expect to target opportunities and companies operating within the broader industrial technology sector, specifically focusing on Industry 4.0, smart manufacturing, next-generation mobility, or related sectors.

This is an initial public offering of our securities. Each unit has an offering price of $10.00 and consists of one Class A ordinary share and one-third of one redeemable warrant. Each whole warrant entitles the holder thereof to purchase one Class A ordinary share at a price of $11.50 per share, subject to adjustment as described herein. Only whole warrants are exercisable. No fractional warrants will be issued upon separation of the units and only whole warrants will trade. The warrants will become exercisable 30 days after the completion of our initial business combination, and will expire five years after the completion of our initial business combination or earlier upon redemption or our liquidation, as described in more detail herein. Subject to the terms and conditions described in this prospectus, we may redeem the warrants for cash once the warrants become exercisable. The underwriter has a 45-day option from the date of this prospectus to purchase up to an additional 2,625,000 units to cover over-allotments, if any.

We will provide our public shareholders with theopportunity to redeem, regardless of whether they abstain, vote for, or against, our initial business combination, all or a portion of their Class A ordinary shares that were sold as part of the units in this offering, which we refer to collectively as our public shares, in connection with the completion of our initial business combination at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the trust account described below as of two business days prior to the consummation of our initial business combination, including interest earned on the funds held in the trust account (net of permitted withdrawals), divided by the number of then outstanding public shares, subject to the limitations and on the conditions described herein. As further described in this prospectus, our amended and restated memorandum and articles of association will provide that a public shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), will be restricted from redeeming its public shares with respect to more than an aggregate of 15%of the then issued and outstanding public shares, without our prior consent. See “Summary — The Offering — Limitation on redemption rights of shareholders holding more than 15% of the public shares sold in this offering if we hold shareholder vote” for further discussion on certain limitations on redemption rights. If we do not consummate an initial business combination within 24 months from the closing of this offering or if our board of directors approves an earlier liquidation, we will redeem 100% of the 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 (net of permitted withdrawals and up to $100,000 of interest to pay liquidation expenses), divided by the number of then issued and outstanding public shares, subject to applicable law and certain conditions as further described herein. We may seek shareholder approval to amend our amended and restated memorandum and articles of association to extend the date by which we must consummate our initial business combination. If we seek shareholder approval for an extension, holders of our public shares will be offered an opportunity to redeem their public shares if such extension is implemented.

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Currently, there is no public market for our units, Class A ordinary shares or warrants. We have applied to have our units listed on The Nasdaq Global Market, or Nasdaq, under the symbol “MIACU,” on or promptly after the date of this prospectus. We cannot guarantee that our securities will be approved for listing on Nasdaq. We expect the Class A ordinary shares and warrants comprising the units to begin separate trading on the 52 ndday following the date of this prospectus unless Cantor Fitzgerald & Co. (“Cantor”), the sole underwriter, informs us of its decision to allow earlier separate trading, subject to our satisfaction of certain conditions as described further herein. Once the securities comprising the units begin separate trading, we expect that the Class A ordinary shares and warrants will be listed on Nasdaq under the symbols “MIAC” and “MIACW,” respectively.

We are an “emerging growth company” and a “smaller reporting company” under applicable federal securities laws and will be subject to reduced public company reporting requirements. Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page47** for a discussion of information that should be considered in connection with an investment in our securities. Investors will not be entitled to protections normally afforded to investors in Rule 419 blank check offerings.**

Of the proceeds we receive from this offering and the sale of the private placement warrants described in this prospectus, $175,000,000, or $201,250,000 if the underwriters’ over-allotment option is exercised in full ($10.00 per unit in either case), will be placed into a U.S.-based trust account with Continental Stock Transfer & Trust Company acting as trustee.

Our sponsor, Meridian3 Partners Sponsor LLC, and our other initial shareholders currently hold an aggregate of 5,031,250 Class B ordinary shares (up to 656,250 of which are subject to forfeiture by the sponsor depending on the extent to which the underwriters’ over-allotment option is exercised) that were purchased for an aggregate purchase price of $25,000, or approximately $0.005 per share. The Class B ordinary shares will automatically convert into Class A ordinary shares at the time of our initial business combination, or at any time prior thereto at the option of the holders thereof, on a one-for-one basis, subject to adjustment as provided herein. If we increase or decrease the size of the offering, we will effect a share capitalization or a share repurchase or redemption or other appropriate mechanism, as applicable, with respect to our Class B ordinary shares immediately prior to the consummation of this offering in such amount as to maintain the number of founder shares at 20% of our issued and outstanding ordinary shares upon the consummation of this offering (excluding the Class A ordinary shares underlying the warrants). In the case that additional Class A ordinary shares, or equity-linked securities (as described herein), are issued or deemed issued in excess of the amounts issued in this offering and related to the closing of our initial business combination, the ratio at which the Class B ordinary shares will convert into Class A ordinary shares will be adjusted (unless the holders of a majority of the issued and outstanding Class B ordinary shares agree to waive such anti-dilution adjustment with respect to any such issuance or deemed issuance) so that the number of Class A ordinary shares issuable upon conversion of all Class B ordinary shares will equal, in the aggregate, 20% of the sum of (i) the total number of all ordinary shares outstanding upon the completion of this offering (including any Class A ordinary shares issued pursuant to the underwriters’ over-allotment option and excluding the Class A ordinary shares underlying the private placement warrants issued to the sponsor and the underwriter), plus (ii) all Class A ordinary shares issued or deemed issued or issuable upon the conversion or exercise of any equity-linked securities issued or deemed issued in connection with our initial business combination (excluding any shares or equity-linked securities issued, or to be issued, to any seller in the initial business combination and any private placement-equivalent warrants issued to our sponsor or any of its affiliates or to our officers and directors upon conversion of working capital loans) minus (iii) any redemptions of Class A ordinary shares by public shareholders prior to or in connection with an initial business combination, provided, that in no event shall the conversion ratio be less than one-to-one. Such adjustments may result in a material dilution to our public

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shareholders. Prior to the closing of our initial business combination, only holders of our Class B ordinary shares (i) will have the right to appoint and remove directors prior to or in connection with the completion of our initial business combination and (ii) will be entitled to vote on continuing our company in a jurisdiction outside the Cayman Islands (including any special resolution required to amend our constitutional documents or to adopt new constitutional documents, in each case, as a result of our approving a transfer by way of continuation to a jurisdiction outside the Cayman Islands). On any other matters submitted to a vote of our shareholders prior to or in connection with the completion of our initial business combination, holders of the Class B ordinary shares and holders of the Class A ordinary shares will vote together as a single class, except as required by law. See the sections entitled “Summary — Our Sponsor” “Summary — The Offering — Founder shares” “Summary — The Offering — Founder shares conversion and anti-dilution rights” “Summary — The Offering — Appointment and removal of directors and continuing the company outside of the Cayman Islands; Voting Rights” “Risk Factors — The ability of our public shareholders to exercise redemption rights with respect to a large number of our shares and the amount of deferred underwriting compensation may not allow us to complete the most desirable business combination or optimize our capital structure, and may substantially dilute your investment in us” “Risk Factors — We may issue additional Class A ordinary shares or preference shares to complete our initial business combination or under an employee incentive plan after completion of our initial business combination. We may also issue Class A ordinary shares upon the conversion of the Class B ordinary shares at a ratio greater than one-to-one at the time of our initial business combination as a result of the anti-dilution provisions contained therein. Any such issuances would dilute the interest of our shareholders and likely present other risks” “Dilution” and “Proposed Business — Our Sponsor” for more information.

In addition, our sponsor and Cantor have committed to purchase an aggregate of 3,666,667 warrants (whether or not the underwriters’ over-allotment option is exercised in full), each exercisable to purchase one Class A ordinary share at $11.50 per share, at a price of $1.50 per warrant, or $5,500,000, in a private placement that will close simultaneously with the closing of this offering. Of those 3,666,667 private placement warrants, our sponsor has agreed to purchase 2,500,000 private placement warrants and Cantor has agreed to purchase an aggregate of 1,166,667 private placement warrants. Each whole private placement warrant is exercisable to purchase one Class A ordinary share at a price of $11.50 per share, subject to the adjustments, terms and limitations as described herein. The private placement warrants will become exercisable 30 days after the completion of our initial business combination, as described in this prospectus. The private placement warrants are identical to the public warrants sold in this offering, subject to certain limited exceptions as described in this prospectus. Our public shareholders may also experience material dilution from the exercise of such private placement warrants, which private placement warrants may be exercised on a cashless basis under the circumstances specified in the warrant agreement filed as an exhibit to the registration statement of which this prospectus forms a part.

[●] institutional investors (none of which are affiliated with any member of our management, our sponsor or any other investor), which we refer to as the “non-managing sponsor investors” throughout this prospectus, have committed to indirectly purchase, through the purchase of non-managing sponsor membership interests, an aggregate of 2,000,000 private placement warrants at a price of $1.50 per warrant ($3,000,000 in the aggregate) in a private placement that will close simultaneously with the closing of this offering. Subject to each non-managing sponsor investor purchasing, through the sponsor, the private placement warrants allocated to it in connection with the closing of this offering, the sponsor will issue membership interests at a nominal purchase price of $0.005 per share to the non-managing sponsor investors reflecting interests in an aggregate of 2,400,000 Class B ordinary shares, which we refer to as “founder shares” throughout this prospectus, representing approximately 54.9% of the 5,031,250 founder shares (or approximately 47.7% if the over-allotment option is exercised in full). Due to such nominal purchase price, the non-managing sponsor investors will have the potential to realize enhanced economic returns from their investment as compared to other investors purchasing in the offering.

None of the non-managing sponsor investors have expressed to us an interest in purchasing any of the units in this offering and neither us nor the representative has had discussions with any non-managing sponsor investors regarding any purchases of units in this offering. Any potential purchase of the non-managing sponsor membership interests would not be contingent upon the participation in this offering or vice-versa. If the non-managing sponsor investors purchase units in the offering, and depending on how many units are purchased by the non-managing sponsor investors, the post-offering trading volume, volatility and liquidity of our securities may be reduced relative to what they would have been had the units been more widely sold to other public investors. We do not expect any potential purchases of units by non-managing sponsor investors to negatively impact our ability to meet Nasdaq listing eligibility requirements. In addition, the underwriter has full discretion to allocate the units to investors and may determine not to sell any units to the non-managing sponsor investors, and in no case would any of the non-managing sponsor investors be sold more than 9.9% of the units to be sold in this offering. The underwriter would receive the same upfront discounts and commissions and deferred underwriting commissions on units purchased by the non-managing sponsor investors, if any, as they will on the other units sold to the public in this offering. In addition, if the non-managing sponsor investors purchase units in the offering, the non-managing sponsor investors would not have any obligation to vote any of their public shares in favor of our initial business combination. Nevertheless, the non-managing sponsor investors would be incentivized to vote any of their public shares, if any, in favor of a business combination due to their indirect

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ownership through the sponsor of founder shares and private placement warrants. For a discussion of certain additional arrangements with the non-managing sponsor investors, see “Summary — The Offering.”

As further described in “Summary — Our Sponsor,” commencing on the date on which our securities are listed on the Nasdaq, we expect to make certain payments and reimbursements, or pay certain fees, to our sponsor, officers or directors, or our or their affiliates, including the payment to our sponsor of up to $20,000 per month for office space, secretarial and administrative services (provided, however, that any portion of such amount not necessary to cover our sponsor’s expenses for the corresponding month shall only become due if and when such initial business combination is completed). In addition, upon consummation of this offering, we will repay up to $300,000 in loans made to us by our sponsor to cover offering-related and organizational expenses. In addition, if our sponsor, officers, directors or any of their affiliates make any working capital loans, up to $1,500,000 of such loans may be converted into private placement warrants, at a price of $1.50 per warrant, at the option of the lender. The conversion of such working capital loans into private placement warrants may result in a material dilution of our public shareholders’ equity interests.See the section titled “Summary — Our Sponsor” for more information regarding, among other things, the amount of compensation and securities received or to be received by our sponsors, their affiliates and our officers and directors.

We have until the date that is 24 months from the closing of this offering or until such earlier liquidation date as our board of directors may approve, to consummate our initial business combination. If we anticipate that we may be unable to consummate our initial business combination within such 24-month period, we may seek shareholder approval to amend our amended and restated memorandum and articlesof association to extend the date by which we must consummate our initial business combination. If we seek shareholder approval for an extension, holders of public shares will be offered an opportunity to redeem their shares, regardless of whether they abstain, vote for, or against, the proposed extension, at a per share price, payable in cash, equal to the aggregate amount then on deposit in the trust account, including interest earned thereon (net of permitted withdrawals), divided by the number of then issued and outstanding public shares, subject to applicable law. If we are unable to complete our initial business combination within 24 months from the closing of this offering, or by such earlier liquidation date as our board of directors may approve, or we do not otherwise seek shareholder approval to amend our amended and restated memorandum and articles of association to further extend the time to complete our business combination, we will redeem 100% of the 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 thereon (net of permitted withdrawals and up to $100,000 of interest to pay liquidation expenses), divided by the number of then issued and outstanding public shares, subject to applicable law and certain conditions as further described herein.

Because our sponsor acquired the founder shares at a nominal price of $25,000, or approximately $0.005 per share, our public shareholders will incur an immediate and substantial dilution upon the closing of this offering. Further, the Class A ordinary shares issuable in connection with the conversion of the founder shares may result in additional material dilution to our public shareholders due to the anti-dilution rights of our founder shares that may result in an issuance of Class A ordinary shares on a greater than one-to-one basis upon conversion.See the sections titled “Risk Factors — Risks Relating to our Securities — The nominal purchase price paid by our sponsor for the founder shares may result in significant dilution to the implied value of your public shares upon the consummation of our initial business combination, and our sponsor is likely to make a substantial profit on its investment in us in the event we consummate an initial business combination, even if the business combination causes the trading price of our ordinary shares to materially decline”,“— Our sponsor paid an aggregate of $25,000, or approximately $0.005 per founder share and, accordingly, you will experience immediate and substantial dilution from the purchase of our Class A ordinary shares**”, “Risks Relating to our Search for, and Consummation of or Inability to Consummate, a Business Combination — We may issue additional Class A ordinary shares or preference shares to complete our initial business combination or under an employee incentive plan after completion of our initial business combination. We may also issue Class A ordinary shares upon the conversion of the founder shares at a ratio greater than one-to-one at the time of our initial business combination as a result of the anti-dilution provisions contained therein. Any such issuances would dilute the interest of our shareholders and likely present other risks” and**“— Unlike some other similarly structured special purpose acquisition companies, our initial shareholders will receive additional Class A ordinary shares if we issue certain shares to consummate an initial business combination in order to provide anti-dilution protection to our initial shareholders.”

In addition, our sponsor, officers, directors or their affiliates may provide us with working capital loans to finance transaction costs in connection with an initial business combination. Up to $1,500,000 of such loans may be convertible into private placement warrants of the post-business combination entity at a price of $1.50 per warrant at the option of the lender. The conversion of such loans into private placement warrants will result in material dilution to our public shareholders. For more information also see “Risk Factors — Risks Relating to our Search for, and Consummation of, or Inability to Consummate, a Business Combination — We may issue shares to investors in connection with our initial business combination at a price which is less than $10.00 or the prevailing market price of

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our shares at that time, which could dilute the interests of our existing shareholders and add costs” and “Risk Factors — Risks Relating to our Sponsor and Management Team — The grant of registration rights to our sponsor, the underwriter and other holders of our private placement warrants may make it more difficult to complete our initial business combination, and the future exercise of such rights may adversely affect the market price of our Class A ordinary shares.”

Members of our management team will directly or indirectly own founder shares and/or private placement warrants following this offering and, accordingly, may have a conflict of interest in determining whether a particular target business is an appropriate business with which to effectuate our initial business combination and in negotiating or accepting the terms of the transaction because of their financial interest in completing an initial business combination within 24 months of the closing of this offering. Further, each of our officers and directors may have a conflict of interest with respect to evaluating a particular business combination if the retention or resignation of any such officers and directors were to be included by a target business as a condition to any agreement with respect to our initial business combination. The low price that our sponsor, executive officers, directors and advisor (directly or indirectly) paid for the founder shares creates an incentive whereby our officers and directors could potentially make a substantial profit even if we select an acquisition target that subsequently declines in value and is unprofitable for public shareholders. If we are unable to complete our initial business combination within 24 months of the closing of this offering, the founder shares may expire worthless, except to the extent they receive liquidating distributions from assets outside the trust account, which could create an incentive for our sponsor, executive officers, directors and advisor to complete a transaction even if we select an acquisition target that subsequently declines in value and is unprofitable for public shareholders. Additionally, some of our officers and directors presently have, and any of them in the future may have additional, fiduciary or contractual obligations to another entity pursuant to which such officer or director is or will be required to present a business combination opportunity to such entity. We may decide to acquire one or more businesses affiliated with our sponsor, executive officers, directors or initial shareholders, or our directors and officers, our sponsor and their affiliates may sponsor or become affiliated with entities that have a similar activity than ours. Accordingly, there may be actual or potential material conflicts of interest between our sponsor, their affiliates or promoters on the one hand, and the investors in this offering on the other hand. See the section titled “Proposed Business — Our Sponsor” for more information.

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The following table illustrates the difference between the public offering price per unit and our net tangible book value per share, as adjusted to reflect various potential redemption levels that may occur in connection with the closing of our initial business combination, which we refer to as Adjusted NTBVPS, on a pro forma basis to give effect to this offering and the issuance of the private placement warrants, assuming no exercise of the over-allotment option and exercise of the over-allotment option in full. Adjusted NTBVPS excludes the effect of the consummation of our initial business combination or any related transactions or expenses.See the section titled “Dilution” for more information.

Our sponsor and members of our management team and our independent directors will directly or indirectly own founder shares and/or private placement warrants following this offering and, accordingly, may have a conflict of interest in determining whether a particular target business is an appropriate business with which to effectuate our initial business combination. Further, each of our officers and directors may have a conflict of interest with respect to evaluating a particular business combination if the retention or resignation of any such officers and directors was included by a target business as a condition to any agreement with respect to our initial business combination. Additionally, some of our officers and directors presently have, and any of them in the future may have additional, fiduciary, contractual or other obligations or duties to one or more other entities pursuant to which such officer or director is or will be required to present a business combination opportunity to such entities.See the sections titled“Summary — Initial Business Combination”, “The Offering — Conflicts of Interest**”, “Risk Factors — Risks Relating to our Sponsor and Management Team — Our key personnel may negotiate employment or consulting agreements with a target business in connection with a particular business combination, and a particular business combination may be conditioned on the retention or resignation of such key personnel. These agreements may provide for them to receive compensation following our initial business combination and as a result, may cause them to have conflicts of interest in determining whether a particular business combination is the most advantageous”,“— Our officers and directors will allocate their time to other businesses thereby causing conflicts of interest in their determination as to how much time to devote to our affairs. This conflict of interest could have a negative impact on our ability to complete our initial business combination”, “— Our officers and directors presently have, and any of them in the future may have additional, fiduciary or contractual obligations to other entities, including other blank check companies, and, accordingly, may have conflicts of interest in allocating their time and in determining to which entity a particular business opportunity should be presented”,“— Our officers, directors, advisors, security holders and their respective affiliates may have competitive pecuniary interests that conflict with our interests”, “Proposed Business — Sourcing of Potential Business Combination Targets”, “Management — Conflicts of Interest”, “Management — Officers, Directors and Director Nominees”, and “**Certain Relationships and Related Party Transactions”.

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The underwriter is offering the units for sale on a firm commitment basis. The underwriter expects to deliver the units to the purchasers on or about , 2026.

Neither the U.S. Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete.Any representation to the contrary is a criminal offense.

Sole Book-Running Manager

Cantor

, 2026

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