JAB Acquisition Corp I

D. Boral Capital LLC is acting the sole book-running manager of the offering and as representative of the underwriters named below. Subject to the terms and conditions of the underwriting agreement dated the date of this prospectus, each underwriter named below has severally agreed to purchase, and we have agreed to sell to that underwriter, the number of units set forth opposite the underwriter’s name.

The underwriting agreement provides that the obligations of the underwriters to purchase the units included in this offering are subject to approval of legal matters by counsel and to other conditions. The underwriters are obligated to purchase all of the units ( other than those covered by the over-allotment option described below) if they purchase any of the units.

Pricing of the Offering

We have been advised by the underwriters that they propose to offer the units to the public at the initial offering price set forth on the cover page of this prospectus and part to certain members of the selling syndicate at a price that represents a concession not in excess of $[0.05] per unit under the public offering price. If all of the units are not sold at the initial offering price, the representative may change the offering price and other selling terms. The offering of the units by the underwriters is subject to receipt and acceptance and subject to the underwriters’ right to reject any order in whole or in part. Sales of any units outside the United States may be made by affiliates of the underwriters.

Over-allotment Option

We have granted to the underwriters an option, exercisable for 45 days from the date of this prospectus, to purchase up to 2,250,000 additional units at the public offering price. The underwriters may exercise this option solely for the purpose of covering over-allotments, if any, in connection with this offering. To the extent the option is exercised, each underwriter must purchase a number of additional units approximately proportionate to that underwriter’s initial purchase commitment. Any units issued or sold under the option will be issued and sold on the same terms and conditions as the other units that are the subject of this offering.

Lock-up

Our officers and directors have agreed not to transfer any ownership interest in, except to permitted transferees, their private units or underlying securities thereof until at least 30 days following the completion of the initial business combination. However, if after a business combination there is a transaction whereby all the outstanding shares are exchanged or redeemed for cash (as would be the case in a post-asset sale liquidation) for another issuer’s shares, then such securities shall be permitted to participate. These transfer restrictions are set forth in the letter agreement described in this prospectus.

Representative Shares

We have agreed to issue to D. Boral and/or its designees, 1,000,000 Class A ordinary shares (whether or not the underwriters’ over-allotment option is exercised in full) upon the consummation of this offering. These shares are being registered in the registration statement of which this prospectus forms a part. D. Boral has agreed not to transfer, assign or sell any such shares until the completion of our initial business combination. In addition, D. Boral has agreed (i) to waive its redemption rights with respect to such shares in connection with the completion of our initial business combination and (ii) to waive its rights to liquidating distributions from the trust account with respect to such shares if we fail to complete our initial business combination within the periods of time as provided in our memorandum and articles of association. The shares issued to D. Boral will be granted customary registration rights in compliance with FINRA Rule 5110(g)(8).

The shares have been deemed compensation by FINRA and are therefore subject to a lock-up for a period of 180 days immediately following the commencement of sales of this offering pursuant to FINRA Rule 5110(e)(1). Pursuant to this FINRA lock-up, these securities cannot be sold, transferred, assigned, pledged or hypothecated or the subject

of any hedging, short sale, derivative, put or call transaction that would result in the economic disposition of the securities by any person for a period of 180 days from the commencement of sales of this offering except as permitted under FINRA Rule 5110(e)(2), including to any underwriter and selected dealer participating in the offering and their officers or partners, registered persons or affiliates.

D. Boral Capital will not confirm sales to any account over which it exercises discretionary authority without the specific prior written approval of the account holder.

Determination of Offering Price

Prior to this offering, there has been no public market for our securities. Consequently, the initial public offering price for the units was determined by negotiations between us and the representative. The determination of our per unit offering price was more arbitrary than would typically be the case if we were an operating company. Among the factors considered in determining the initial public offering price were the history and prospects of companies whose principal business is the acquisition of other companies, prior offerings of those companies, our management, our capital structure, and currently prevailing general conditions in equity securities markets, including current market valuations of publicly traded companies considered comparable to our company. We cannot assure you, however, that the price at which the units, Class A ordinary shares or warrants or rights will sell in the public market after this offering will not be lower than the initial public offering price or that an active trading market in our units, Class A ordinary shares or warrants or rights will develop and continue after this offering.

Listing

We expect our units to be listed on the Nasdaq under the symbol “JABU” commencing on or promptly after the date of this prospectus, and, once the Class A ordinary shares and warrants and rights begin separate trading, to have our Class A ordinary shares and warrants and rights listed on Nasdaq under the symbols “JAB,” “JABW” and “JABRR” respectively. We cannot guarantee that our securities will be approved for listing on the Nasdaq.

Discounts

The following table shows the underwriting discounts and commissions that we are to pay to the underwriter in connection with this offering. These amounts are shown assuming both no exercise and full exercise of the underwriters’ over-allotment option.

(1) The representative of the underwriters or its designees will receive an aggregate of 1,000,000 Class A ordinary shares (whether or not the over-allotment option is exercised), which we refer to herein as the “representative shares,” as compensation in connection with this offering. In addition, $0.70 per unit sold in the base offering, or deferred underwriting commissions equal to 7.0% of the gross proceeds remaining in the trust account following redemptions, not to exceed $3,000,000 in the aggregate (whether or not the over-allotment option is exercised), for deferred underwriting commissions will be placed in a trust account located in the United States as described herein. The deferred commissions will be released to D. Boral Capital LLC for its own account concurrently with completion of an initial business combination in the amounts set forth above, as described in this prospectus.

(2) Does not include a cash payment of $1,000,000 to be paid to the representative of the underwriters (whether or not the over-allotment option is exercised) and certain fees and expenses incurred by the underwriters in connection with this offering, which we have agreed to reimburse the underwriters in an amount not to exceed $200,000 in the aggregate.

We estimate that our portion of the total expenses of this offering payable by us will be $1,655,000. We have also agreed to pay the actual fees and reasonable out-of-pocket expenses of the underwriter and its legal counsel, not to exceed $200,000 if there is a closing and $100,000 if there is not a closing, provided that costs and expenses incurred by the representative in connection with its background check process will not be subject to the foregoing cap and will be reimbursed in full.

Right of First Refusal

Subject to certain conditions, we granted D. Boral Capital an irrevocable right of first refusal for a period of twenty-four (24) months commencing upon the closing of the initial business combination to act as sole investment banker, sole book-runner and/or sole placement agent at D. Boral Capital’s sole discretion, for each and every future public and private equity and debt offering, including equity-linked financings, forward purchase agreement and similar equity line financings. The right of first refusal shall also encompass the time period leading up to the closing of the business combination while the Company is still a Special Purpose Acquisition Company. In accordance with FINRA Rule 5110(g)(6), such right of first refusal shall not have a duration of more than three years from the commencement of sales of this offering or the termination date of the underwriting agreement between us and D. Boral Capital.

Stabilization and Other Transactions

The underwriters pursuant to Regulation M under the Exchange Act may engage in short sale transactions, stabilizing transactions, syndicate covering transactions or the imposition of penalty bids in connection with this offering. These activities may have the effect of stabilizing or maintaining the market price of the units at a level above that which might otherwise prevail in the open market. Establishing short sales positions may involve either “covered” short sales or “naked” short sales.

“Covered” short sales are sales made in an amount not greater than the underwriters’ option to purchase additional units in this offering. The underwriters may close out any covered short position by either exercising the overallotment option or purchasing our securities in the open market or from market participants. In determining the source of units to close out the covered short position, the underwriters will consider, among other things, the price of units available for purchase in the market as compared to the price at which they may purchase units through the overallotment option.

“Naked” short sales are sales in excess of the option to purchase additional units. The underwriters must close out any naked short position by purchasing units in the open market. A naked short position is more likely to be created if the underwriters are concerned that there may be downward pressure on the price of the units in the open market after pricing that could adversely affect investors who purchase in this offering.

A stabilizing bid is a bid for the purchase of securities on behalf of the underwriters for the purpose of fixing or maintaining the price of the securities. A syndicate covering transaction is the bid for or the purchase of securities on behalf of the underwriters to reduce a short position incurred by the underwriters in connection with the offering. Similar to other purchase transactions, the underwriters’ purchases to cover the syndicate short sales may have the effect of raising or maintaining the market price of our securities or preventing or retarding a decline in the market price of our securities. As a result, the price of our securities may be higher than the price that might otherwise exist in the open market. A penalty bid is an arrangement permitting the underwriters to reclaim the selling concession otherwise accruing to a syndicate member in connection with the offering if the securities originally sold by such syndicate member are purchased in a syndicate covering transaction and therefore have not been effectively placed by such syndicate member.

Neither we, nor any of the underwriters make any representation or prediction as to the direction or magnitude of any effect that the transactions described above may have on the price of our securities. The underwriters are not obligated to engage in these activities and, if commenced, may end any of these activities at any time. These transactions may be effected on Nasdaq, in the over-the-counter market or otherwise.

We have agreed to indemnify the several underwriters against certain liabilities, including liabilities under the Securities Act, or to contribute to payments the underwriters may be required to make because of any of those liabilities.

Market Making

The underwriters have advised us that, following the completion of this offering, they may make a market in the units as permitted by applicable laws and regulations. However, the underwriters are not obligated to do so, and the underwriters may discontinue any market-making activities at any time without notice in their sole discretion.

Accordingly, no assurance can be given as to the liquidity of the trading market for the units, that you will be able to sell any of the units held by you at a particular time or that the prices that you receive when you sell would be favorable.

Other Terms

We will agree to indemnify the underwriter against certain liabilities, including liabilities under the Securities Act, or to contribute to payments the underwriter may be required to make because of any of those liabilities.

The underwriting agreement provides that, following the completion of this offering, the obligations of the underwriters with respect to this offering will be deemed to be satisfied and the underwriters are not bound by any commitment or obligation to offer or sell to the public any of our securities or of any target business in an initial business combination or otherwise solicit holders of our securities or any target business in an initial business combination to approve the business combination.

We are not under any contractual obligation to engage any of the underwriters to provide any services for us after this offering, and have no present intent to do so. However, any of the underwriters may introduce us to potential target businesses or assist us in raising additional capital in the future. If any of the underwriters provide services to us after this offering, we may pay such underwriter fair and reasonable fees that would be determined at that time in an arm’s length negotiation; provided that no agreement will be entered into with any of the underwriters and no fees for such services will be paid to any of the underwriters prior to the date that is 60 days from the date of this prospectus, unless FINRA determines that such payment would not be deemed underwriters’ compensation in connection with this offering.

Some of the underwriters and their respective affiliates are full service financial institutions engaged in various activities, which may include sales and trading, commercial and investment banking, advisory, investment management, investment research, principal investment, hedging, market making, brokerage and other financial and non-financial activities and services. Some of the underwriters and their affiliates have engaged in, and may in the future engage in, investment banking and other commercial dealings in the ordinary course of business with us or our affiliates, including in connection with acting in an advisory capacity or as a potential financing source in conjunction with our potential acquisition of a company. They have received, or may in the future receive, customary fees and commissions for these transactions.

In the ordinary course of their various business activities, some of the underwriters and their respective affiliates, officers, directors and employees may purchase, sell or hold a broad array of investments and actively trade debt or equity securities, derivatives, loans, commodities, currencies, credit default swaps and other financial instruments for their own account and for the accounts of their customers and such investment and trading activities may involve or relate to assets, securities and/or instruments of ours and/or of persons and entities with relationships with us. Some of the underwriters and their respective affiliates may also communicate independent investment recommendations and/or publish or express independent research views in respect of such securities or instruments and may at any time hold, or recommend to clients that they should acquire, long and/or short positions in such securities and/or instruments.

Selling Restrictions

Notice to Prospective Investors in the European Economic Area

In relation to each Member State of the European Economic Area (each, a “Member State”), the underwriter represents and agrees that it has not made and will not make an offer of units to the public in that Member State except that it may make an offer of units to the public in that Member State at any time,

(a) to legal entities which are qualified investors as defined in the Prospectus Regulation;

(b) to fewer than 150 natural or legal persons (other than qualified investors as defined in the Prospectus Regulation) subject to obtaining the prior consent of the underwriter for any such offer; or

(c) in any other circumstances which do not require the publication by the issuer of a prospectus pursuant to Article 1(4) of the Prospectus Regulation.

Provided that no such offer of units shall require the company or the underwriter to publish a prospectus pursuant to Article 3 of the Prospectus Regulation or supplement a prospectus pursuant to Article 23 of the Prospectus Regulation.

For the purposes of this provision, the expression an “offer of units to the public” in relation to any units in any Member State means the communication in any form and by any means of sufficient information on the terms of the offer and the units to be offered so as to enable an investor to decide to purchase or subscribe the units, and the expression Prospectus Regulation means Regulation (EU) 2017/1129 (as amended or superseded).

Notice to Prospective Investors in the United Kingdom

The underwriter represents and agrees that it has not made and will not make an offer of units to the public in the United Kingdom, except that it may make an offer of units to the public in the United Kingdom at any time:

(a) to any legal entity which is a qualified investor as defined in Article 2 of the UK Prospectus Regulation;

(b) to fewer than 150 natural or legal persons (other than qualified investors as defined in the UK Prospectus Regulation) in the United Kingdom subject to obtaining the prior consent of the underwriter for any such offer; or

(c) at any time in any other circumstances falling within section 86 of the FSMA,

Provided that no such offer of units shall require the company or the underwriter to publish a prospectus pursuant to section 85 of the FSMA or supplement a prospectus pursuant to the UK Prospectus Regulation.

For the purposes of this provision, the expression an offer of units to the public in relation to any units means the communication in any form and by any means of sufficient information on the terms of the offer and the units to be offered so as to enable an investor to decide to purchase or subscribe for the units.

The underwriter represents, warrants and agrees as follows:

(a) it has only communicated or caused to be communicated and will only communicate or cause to be communicated an invitation or inducement to engage in investment activity (within the meaning of section 21 of FSMA) in circumstances in which section 21(1) of FSMA does not apply to the company; and

(b) it has complied with, and will comply with all applicable provisions of FSMA with respect to anything done by it in relation to the units in, from or otherwise involving the United Kingdom.

Notice to Residents of Japan

The underwriter will not offer or sell any of our units directly or indirectly in Japan or to, or for the benefit of any Japanese person or to others, for re-offering or re-sale directly or indirectly in Japan or to any Japanese person, except in each case pursuant to an exemption from the registration requirements of, and otherwise in compliance with, the Securities and Exchange Law of Japan and any other applicable laws and regulations of Japan. For purposes of this paragraph, “Japanese person” means any person resident in Japan, including any corporation or other entity organized under the laws of Japan.

Notice to Residents of Hong Kong

The underwriter and each of its affiliates have not (1) offered or sold, and will not offer or sell, in Hong Kong, by means of any document, our units other than (A) to “professional investors” as defined in the Securities and Futures Ordinance (Cap.571) of Hong Kong and any rules made under that Ordinance or (A) in other circumstances which do not result in the document being a “prospectus” as defined in the Companies Ordinance (Cap. 32 of Hong Kong) or which do not constitute an offer to the public within the meaning of that Ordinance or (2) issued or had in its possession for the purposes of issue, and will not issue or have in its possession for the purposes of issue, whether in

Hong Kong or elsewhere any advertisement, invitation or document relating to our units which is directed at, or the contents of which are likely to be accessed or read by, the public in Hong Kong (except if permitted to do so under the securities laws of Hong Kong) other than with respect to our securities which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” as defined in the Securities and Futures Ordinance and any rules made under that Ordinance. The contents of this document have not been reviewed by any regulatory authority in Hong Kong. You are advised to exercise caution in relation to the offer. If you are in any doubt about any of the contents of this document, you should obtain independent professional advice.

Notice to Residents of Singapore

This prospectus has not been registered as a prospectus with the Monetary Authority of Singapore. Accordingly, this prospectus and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the units may not be circulated or distributed, nor may the units be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (i) to an Section 274 of the Securities and Futures Act, Chapter 289 of Singapore (the “SFA”), (ii) to a relevant person pursuant to Section 275(1), or any person pursuant to Section 275(1A), and in accordance with the conditions specified in Section 275 of the SFA or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA, in each case subject to compliance with conditions set forth in the SFA.

Where the units are subscribed or purchased under Section 275 of the SFA by a relevant person which is

• a corporation (which is not an accredited investor (as defined in Section 4A of the SFA)) the sole business of which is to hold investments and the entire share capital of which is owned by one or more individuals, each of whom is an accredited investor; or

• a trust (where the trustee is not an accredited investor) whose sole purpose is to hold investments and each beneficiary is an accredited investor, shares, debentures and units of shares and debentures of that corporation or the beneficiaries’ rights and interest (howsoever described) in that trust shall not be transferred within six months after that corporation or that trust has acquired the shares pursuant to an offer made under Section 275 of the SFA except:

• to an institutional investor (for corporations, under Section 274 of the SFA) or to a relevant person defined in Section 275(2) of the SFA, or to any person pursuant to an offer that is made on terms that such shares, debentures and units of shares and debentures of that corporation or such rights and interest in that trust are acquired at a consideration of not less than $250,000 (or its equivalent in a foreign currency) for each transaction, whether such amount is to be paid for in cash or by exchange of securities or other assets, and further for corporations, in accordance with the conditions specified in Section 275 of the SFA;

• where no consideration is or will be given for the transfer; or

• where the transfer is by operation of law.

Notification under Section 309B(1)(c) of the Securities and Futures Act, Chapter 289 of Singapore. The securities are “prescribed capital markets products” (as defined in the Securities and Futures (Capital Markets Products) Regulations 2018) and Excluded Investment Products (as defined in MAS Notice SFA 04-N12: Notice on the Sale of Investment Products and MAS Notice FAA-N16: Notice on Recommendations on Investment Products).

Notice to Residents of Germany

Each person who is in possession of this prospectus is aware that no German sales prospectus (Verkaufsprospekt) within the meaning of the Securities Sales Prospectus Act (Wertpapier-Verkaufsprospektgesetz, the “Act”) of the Federal Republic of Germany has been or will be published with respect to our units. In particular, the underwriter has represented that it has not engaged and will agree that it will not engage in a public offering (offentliches Angebot) within the meaning of the Act with respect to any of our units otherwise then in accordance with the Act and all other applicable legal and regulatory requirements.

Notice to Residents of France

The units are being issued and sold outside the Republic of France and that, in connection with their initial distribution, it has not offered or sold and will not offer or sell, directly or indirectly, any units to the public in the Republic of France, and that it has not distributed and will not distribute or cause to be distributed to the public in the Republic of France this prospectus or any other offering material relating to the units, and that such offers, sales and distributions have been and will be made in the Republic of France only to qualified investors (investisseurs qualifiés) in accordance with Article L.411-2 of the Monetary and Financial Code and decrét no. 98-880 dated October 1, 1998.

Notice to Residents of the Netherlands

Our units may not be offered, sold, transferred or delivered in or from the Netherlands as part of their initial distribution or at any time thereafter, directly or indirectly, other than to, individuals or legal entities situated in The Netherlands who or which trade or invest in securities in the conduct of a business or profession (which includes banks, securities intermediaries (including dealers and brokers), insurance companies, pension funds, collective investment institutions, central governments, large international and supranational organizations, other institutional investors and other parties, including treasury departments of commercial enterprises, which as an ancillary activity regularly invest in securities; hereinafter, “Professional Investors”); provided that in the offer, prospectus and in any other documents or advertisements in which a forthcoming offering of our units is publicly announced (whether electronically or otherwise) in The Netherlands it is stated that such offer is and will be exclusively made to such Professional Investors. Individual or legal entities who are not Professional Investors may not participate in the offering of our units, and this prospectus or any other offering material relating to our units may not be considered an offer or the prospect of an offer to sell or exchange our units.

Notice to Prospective Investors in Switzerland

The units may not be publicly offered in Switzerland and will not be listed on the SIX Swiss Exchange (“SIX”) or on any other stock exchange or regulated trading facility in Switzerland. This document has been prepared without regard to the disclosure standards for issuance prospectuses under art. 652a or art. 1156 of the Swiss Code of Obligations or the disclosure standards for listing prospectuses under art. 27 ff. of the SIX Listing Rules or the listing rules of any other stock exchange or regulated trading facility in Switzerland. Neither this document nor any other offering or marketing material relating to the units or the offering may be publicly distributed or otherwise made publicly available in Switzerland.

Neither this document nor any other offering or marketing material relating to the offering, the company, the units have been or will be filed with or approved by any Swiss regulatory authority. In particular, this document will not be filed with, and the offer of units will not be supervised by, the Swiss Financial Market Supervisory Authority FINMA (FINMA), and the offer of units has not been and will not be authorized under the Swiss Federal Act on Collective Investment Schemes (“CISA”). The investor protection afforded to acquirers of interests in collective investment schemes under the CISA does not extend to acquirers of units.

Notice to Prospective Investors in the Dubai International Financial Centre

This prospectus relates to an Exempt Offer in accordance with the Offered Securities Rules of the Dubai Financial Services Authority (“DFSA”). This prospectus is intended for distribution only to persons of a type specified in the Offered Securities Rules of the DFSA. It must not be delivered to, or relied on by, any other person. The DFSA has no responsibility for reviewing or verifying any documents in connection with Exempt Offers. The DFSA has not approved this prospectus nor taken steps to verify the information set forth herein and has no responsibility for the prospectus. The shares to which this prospectus relates may be illiquid and/or subject to restrictions on their resale. Prospective purchasers of the units offered should conduct their own due diligence on the units. If you do not understand the contents of this prospectus you should consult an authorized financial advisor.

Notice to Canadian Residents

Resale Restrictions

The distribution of units in Canada is being made on a private placement basis exempt from the requirement that we prepare and file a prospectus with the securities regulatory authorities in each province where trades of these securities are made. Any resale of the units in Canada must be made under applicable securities laws which may vary depending on the relevant jurisdiction, and which may require resales to be made under available statutory exemptions or under a discretionary exemption granted by the applicable Canadian securities regulatory authority. Purchasers are advised to seek legal advice prior to any resale of the securities.

Representations of Canadian Purchasers

By purchasing units in Canada and accepting delivery of a purchase confirmation, a purchaser is representing to us and the dealer from whom the purchase confirmation is received that:

• the purchaser is entitled under applicable provincial securities laws to purchase the units without the benefit of a prospectus qualified under those securities laws as it is an “accredited investor” as defined under National Instrument 45 — 106 — Prospectus Exemptions or Section 73.3 of the Securities Act (Ontario), as applicable;

• is a “permitted client” as defined in National Instrument 31 — 103 — Registration Requirements, Exemptions and Ongoing Registrant Obligations;

• where required by law, the purchaser is purchasing as principal and not as agent; and

• the purchaser has reviewed the text above under Resale Restrictions.

Conflicts of Interest

Canadian purchasers are hereby notified that the underwriter is relying on the exemption set out in section 3A.3 or 3A.4, if applicable, of National Instrument 33-105 — Underwriting Conflicts from having to provide certain conflict of interest disclosure in this document.

Statutory Rights of Action

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if the prospectus (including any amendment thereto) such as this document contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by the securities legislation of the purchaser’s province or territory. The purchaser of these securities in Canada should refer to any applicable provisions of the securities legislation of the purchaser’s province or territory for particulars of these rights or consult with a legal advisor.

Enforcement of Legal Rights

All of our directors and officers as well as the experts named herein may be located outside of Canada and, as a result, it may not be possible for Canadian purchasers to effect service of process within Canada upon us or those persons. All or a substantial portion of our assets and the assets of those persons may be located outside of Canada and, as a result, it may not be possible to satisfy a judgment against us or those persons in Canada or to enforce a judgment obtained in Canadian courts against us or those persons outside of Canada.

Taxation and Eligibility for Investment

Canadian purchasers of units should consult their own legal and tax advisors with respect to the tax consequences of an investment in the units in their particular circumstances and about the eligibility of the units for investment by the purchaser under relevant Canadian legislation.