Form of Private Placement Warrants Purchase Agreement between the Registrant, Cohen & Company Capital Markets, a division of J.V.B. Financial Group, LLC, and Needham & Company, LLC

Exhibit 10.5

PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT

THIS PRIVATE PLACEMENT WARRANTS PURCHASE AGREEMENT, dated as of [●], 2025 (as it may from time to time be amended, this “Agreement”), is entered into by and between Berto Acquisition Corp., a Cayman Islands exempted company (the “Company”), Cohen & Company Capital Markets, a division of J.V.B. Financial Group, LLC (“CCM”), and Needham & Company, LLC (“Needham” and together with CCM, the “Purchasers” and each, a “Purchaser”).

WHEREAS, the Company intends to consummate an initial public offering of the Company’s units (the “Public Offering”), each unit consisting of one ordinary share, par value $0.0001 per share, of the Company (an “Ordinary Share”), and one-half of one redeemable warrant.

WHEREAS, each whole warrant entitles the holder to purchase one Ordinary Share at an exercise price of $10.50 per share within the first 12 months following the closing of an initial business combination or $11.50 per share after the 12-month anniversary of the closing of the initial business combination (subject to adjustment).

WHEREAS, the Company has agreed to issue to the Purchasers an aggregate of 3,750,000 warrants (the “Private Placement Warrants”), each Private Placement Warrant entitling the holder to purchase one Ordinary Share at an exercise price of $10.50 per share within the first 12 months following the closing of an initial business combination or $11.50 per share after the 12-month anniversary of the closing of the initial business combination (subject to adjustment).

NOW THEREFORE, in consideration of the mutual promises contained in this Agreement and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties to this Agreement hereby, intending legally to be bound, agree as follows:

AGREEMENT

Section 1. Authorization, Issuance and Sale; Terms of the Private Placement Warrants.

A. Authorization of the Private Placement Warrants. The Company has duly authorized the issuance and sale of the Private Placement Warrants to the Purchasers.

B. Issuance and Sale of the Private Placement Warrants.

(i) On the date of the consummation of the Public Offering or on such earlier time and date as may be mutually agreed by the Purchasers and the Company (the “Closing Date”), the Company shall issue to the Purchasers an aggregate of 3,750,000 Private Placement Warrants. On the Closing Date, the Company, at its option, shall deliver a certificate evidencing the Private Placement Warrants issued to the Purchasers on such date duly registered in each Purchaser’s name to each Purchaser, or effect such delivery in book-entry form.

C. Terms of the Private Placement Warrants.

(i) Each Private Placement Warrant shall have the terms set forth in a Warrant Agreement to be entered into by the Company and a warrant agent in connection with the Public Offering (a “Warrant Agreement”). The Private Placement Warrants may not be exercisable more than five years from the commencement of sales in the Public Offering in accordance with FINRA Rule 5110(g)(8).

(ii) At the time of the closing of the Public Offering, the Company and the Purchasers shall enter into a registration rights agreement (the “Registration Rights Agreement”) pursuant to which the Company will grant certain registration rights to the Purchasers relating to the Private Placement Warrants and the Ordinary Shares underlying the Private Placement Warrants. Pursuant to the terms of the Registration Rights Agreement, the Purchasers (i) may not exercise its demand registration rights after five (5) years from the commencement of sales in the Public Offering, and may not exercise its demand rights on more than one occasion in accordance with FINRA Rules 5110(g)(8)(C) and 5110(g)(8)(B), and (ii) may not exercise its “piggyback” registration rights after seven (7) years from the commencement of sales in the Public Offering in accordance with FINRA Rule 5110(g)(8)(D).

(iii) Each Purchaser hereby agrees not to transfer, assign or sell any of the Private Placement Warrants and the Ordinary Shares underlying the Private Placement Warrants, until 30 days after the Company’s completion of its initial business combination transaction. The foregoing transfer restrictions shall not apply to transfers by a Purchaser or by the recipient of any below-described transfer (such recipient, a “Permitted Transferee”):

(a) to the Company’s officers or directors, any affiliates or family members of the Company’s officers or directors, any members of the Purchaser, or any affiliates of the Purchaser;

(b) in the case of an individual, by gift to a member of the individual’s immediate family or to a trust, the beneficiary of which is a member of the individual’s immediate family or an affiliate of such person, or to a charitable organization;

(c) in the case of an individual, by virtue of laws of descent and distribution upon death of the individual;

(d) in the case of an individual, pursuant to a qualified domestic relations order;

(e) by private sales or transfers made in connection with the consummation of a business combination at prices no greater than the price at which the securities were originally purchased;

(f) in the event of the liquidation of the Company prior to the Company’s completion of its initial business combination;

(g) by virtue of the laws of the Cayman Islands or the Purchaser’s exempted limited partnership agreement, as amended, upon liquidation of the Purchaser; or

(h) in the event of the Company’s completion of a liquidation, merger, amalgamation, share exchange, reorganization or other similar transaction which results in all of its shareholders having the right to exchange their Ordinary Shares for cash, securities or other property subsequent to the Company’s completion of its initial business combination;

provided, however, that except with the Company’s prior consent, in the case of clauses (a) through (e), or (g), above, the Permitted Transferee must enter into a written agreement agreeing to be bound by these transfer restrictions and by the same agreements entered into by such Purchaser with respect to the Private Placement Warrants (including provisions relating to voting, the trust account and liquidation distributions, as described in the prospectus forming a part of the Company’s registration statement on Form S-1).

In addition to the restrictions on transfer described above, each Purchaser acknowledges and agrees that the Private Placement Warrants and their component parts and the related registration rights will be deemed compensation by the Financial Industry Regulatory Authority (“FINRA”) and will therefore, pursuant to Rule 5110(e) of the FINRA Manual, be subject to lock-up for a period of 180 days immediately following the commencement of sales in the Public Offering, subject to FINRA Rule 5110(e)(2). Additionally, the Private Placement Warrants and their component parts and the related registration rights may not be sold, transferred, assigned, pledged or hypothecated during the foregoing 180 day period except to any underwriter or selected dealer participating in the Public Offering and the officers or partners, registered persons or affiliates of the Purchasers and any such participating underwriter or selected dealer. Additionally, the Private Placement Warrants and their component parts and the related registration rights will not be the subject of any hedging, short sale, derivative, put or call transaction that would result in the economic disposition of such securities by any person for a period of 180 days immediately following the commencement of sales in the Public Offering.

Section 2. Representations and Warranties of the Company. As a material inducement to the Purchasers to enter into this Agreement, the Company hereby represents and warrants to the Purchasers (which representations and warranties shall survive the Closing Date) that:

A. Incorporation and Corporate Power. The Company is an exempted company duly incorporated, validly existing and in good standing under the laws of the Cayman Islands and is qualified to do business in every jurisdiction in which the failure to so qualify would reasonably be expected to have a material adverse effect on the financial condition, operating results or assets of the Company. The Company possesses all requisite corporate power and authority necessary to carry out the transactions contemplated by this Agreement and the Warrant Agreement.

B. Authorization; No Breach.

(i) The execution, delivery and performance of this Agreement and the Private Placement Warrants have been duly authorized by the Company as of the Closing Date. This Agreement constitutes the valid and binding obligation of the Company, enforceable in accordance with its terms. Upon issuance in accordance with, and payment pursuant to, the terms of the Warrant Agreement and this Agreement, the Private Placement Warrants will constitute valid and binding obligations of the Company, enforceable in accordance with their terms as of the Closing Date.

(ii) The execution and delivery by the Company of this Agreement and the Private Placement Warrants, the issuance and sale of the Private Placement Warrants, the issuance of the Ordinary Shares upon exercise of the Private Placement Warrants and the fulfillment of, and compliance with, the respective terms hereof and thereof by the Company, do not and will not as of the Closing Date (a) conflict with or result in a breach of the terms, conditions or provisions of, (b) constitute a default under, (c) result in the creation of any lien, security interest, charge or encumbrance upon the Company’s equity or assets under, (d) result in a violation of, or (e) require any authorization, consent, approval, exemption or other action by or notice or declaration to, or filing with, any court or administrative or governmental body or agency pursuant to the Amended and Restated Memorandum and Articles of Association of the Company in effect on the date hereof or as may be amended prior to completion of the contemplated Public Offering, or any material law, statute, rule or regulation to which the Company is subject, or any agreement, order, judgment or decree to which the Company is subject, except for any filings required after the date hereof under federal or state securities laws.

C. Title to Securities. Upon issuance in accordance with, and payment pursuant to, the terms hereof and the Warrant Agreement, and upon registration in the Company’s register of members, the Ordinary Shares issuable upon exercise of the Private Placement Warrants will be duly and validly issued, fully paid and nonassessable. Upon issuance in accordance with, and payment pursuant to, the terms hereof and the Warrant Agreement, and upon registration in the Company’s register of members, the Purchasers will have good title to the Private Placement Warrants and the Ordinary Shares issuable upon exercise of such Private Placement Warrants, free and clear of all liens, claims and encumbrances of any kind, other than (i) transfer restrictions hereunder and under the other agreements contemplated hereby, (ii) transfer restrictions under federal and state securities laws, and (iii) liens, claims or encumbrances imposed due to the actions of the Purchasers.

D. Governmental Consents. No permit, consent, approval or authorization of, or declaration to or filing with, any governmental authority is required in connection with the execution, delivery and performance by the Company of this Agreement or the consummation by the Company of any other transactions contemplated hereby.

E. Regulation D Qualification. Neither the Company nor, to its knowledge, any of its affiliates, members, officers, directors or beneficial shareholders of 20% or more of its outstanding securities, has experienced a disqualifying event as enumerated pursuant to Rule 506(d) of Regulation D under the Securities Act of 1933, as amended (the “Securities Act”).

Section 3. Representations and Warranties of each Purchaser. As a material inducement to the Company to enter into this Agreement and issue the Private Placement Warrants to the Purchaser, each Purchaser hereby represents and warrants to the Company (which representations and warranties shall survive each Closing Date) that:

A. Organization and Requisite Authority. The Purchaser possesses all requisite power and authority necessary to carry out the transactions contemplated by this Agreement.

B. Authorization; No Breach.

(i) This Agreement constitutes a valid and binding obligation of the Purchaser, enforceable in accordance with its terms, subject to bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium and other laws of general applicability relating to or affecting creditors’ rights and to general equitable principles (whether considered in a proceeding in equity or law).

(ii) The execution and delivery by the Purchaser of this Agreement and the fulfillment of and compliance with the terms hereof by the Purchaser does not and shall not as of each Closing Date conflict with or result in a breach by the Purchaser of the terms, conditions or provisions of any agreement, instrument, order, judgment or decree to which the Purchaser is subject.

C. Investment Representations.

(i) The Purchaser is acquiring the Private Placement Warrants and, upon exercise of the Private Placement Warrants, the Ordinary Shares issuable upon such exercise (collectively, the “Securities”), for the Purchaser’s own account, for investment purposes only and not with a view towards, or for resale in connection with, any public sale or distribution thereof.

(ii) The Purchaser is an “accredited investor” as such term is defined in Rule 501(a)(3) of Regulation D, and the Purchaser has not experienced a disqualifying event as enumerated pursuant to Rule 506(d) of Regulation D under the Securities Act.

(iii) The Purchaser understands that the Securities are being offered and will be sold to it in reliance on specific exemptions from the registration requirements of the United States federal and state securities laws and that the Company is relying upon the truth and accuracy of, and the Purchaser’s compliance with, the representations and warranties of the Purchaser set forth herein in order to determine the availability of such exemptions and the eligibility of the Purchaser to acquire such Securities.

(iv) The Purchaser did not decide to enter into this Agreement as a result of any general solicitation or general advertising within the meaning of Rule 502(c) under the Securities Act.

(v) The Purchaser has been furnished with all materials relating to the business, finances and operations of the Company and materials relating to the offer and sale of the Securities which have been requested by the Purchaser. The Purchaser has been afforded the opportunity to ask questions of the executive officers and directors of the Company. The Purchaser understands that its investment in the Securities involves a high degree of risk and it has sought such accounting, legal and tax advice as it has considered necessary to make an informed investment decision with respect to the acquisition of the Securities.

(vi) The Purchaser understands that no United States federal or state agency or any other government or governmental agency has passed on or made any recommendation or endorsement of the Securities or the fairness or suitability of the investment in the Securities by the Purchaser nor have such authorities passed upon or endorsed the merits of the offering of the Securities.

(vii) The Purchaser understands that: (a) the Securities have not been and are not being registered under the Securities Act or any state securities laws, and may not be offered for sale, sold, assigned or transferred unless (1) subsequently registered thereunder or (2) sold in reliance on an exemption therefrom; and (b) except as specifically set forth in the Registration Rights Agreement, neither the Company nor any other person is under any obligation to register the Securities under the Securities Act or any state securities laws or to comply with the terms and conditions of any exemption thereunder. While the Purchaser understands that Rule 144 is not available for the resale of securities initially issued by shell companies (other than business combination related shell companies) or issuers that have been at any time previously a shell company, the Purchaser understands that Rule 144 includes an exception to this prohibition if the following conditions are met: (i) the issuer of the securities that was formerly a shell company has ceased to be a shell company; (ii) the issuer of the securities is subject to the reporting requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”); (iii) the issuer of the securities has filed all Exchange Act reports and material required to be filed, as applicable, during the preceding 12 months (or such shorter period that the issuer was required to file such reports and materials), other than Form 8-K reports; and (iv) at least one year has elapsed from the time that the issuer filed current Form 10 type information with the SEC reflecting its status as an entity that is not a shell company.

(viii) The Purchaser has such knowledge and experience in financial and business matters, knows of the high degree of risk associated with investments in the securities of companies in the development stage such as the Company, is capable of evaluating the merits and risks of an investment in the Securities and is able to bear the economic risk of an investment in the Securities in the amount contemplated hereunder for an indefinite period of time. The Purchaser has adequate means of providing for its current financial needs and contingencies and will have no current or anticipated future needs for liquidity which would be jeopardized by the investment in the Securities. The Purchaser can afford a complete loss of its investment in the Securities.

Section 4. Conditions of each Purchaser’s Obligations. The obligation of each Purchaser to subscribe for the Private Placement Warrants is subject to the fulfillment, on or before each Closing Date, of each of the following conditions:

A. Representations and Warranties. The representations and warranties of the Company contained in Section 2 shall be true and correct at and as of such Closing Date as though then made.

B. Performance. The Company shall have performed and complied with all agreements, obligations and conditions contained in this Agreement that are required to be performed or complied with by it on or before such Closing Date.

C. No Injunction. No litigation, statute, rule, regulation, executive order, decree, ruling or injunction shall have been enacted, entered, promulgated or endorsed by or in any court or governmental authority of competent jurisdiction or any self-regulatory organization having authority over the matters contemplated hereby, which prohibits the consummation of any of the transactions contemplated by this Agreement or the Warrant Agreement.

D. Warrant Agreement. The Company shall have entered into the Warrant Agreement with a warrant agent on terms satisfactory to the Purchasers.

Section 5. Conditions of the Company’s Obligations. The obligations of the Company to the Purchasers under this Agreement are subject to the fulfillment, on or before each Closing Date, of each of the following conditions:

A. Representations and Warranties. The representations and warranties of each Purchaser contained in Section 3 shall be true and correct at and as of such Closing Date as though then made.

B. Performance. Each Purchaser shall have performed and complied with all agreements, obligations and conditions contained in this Agreement that are required to be performed or complied with by such Purchaser on or before such Closing Date.

C. Corporate Consents. The Company shall have obtained the consent of its Board of Directors authorizing the execution, delivery and performance of this Agreement and the Warrant Agreement and the issuance and sale of the Private Placement Warrants hereunder.

D. No Injunction. No litigation, statute, rule, regulation, executive order, decree, ruling or injunction shall have been enacted, entered, promulgated or endorsed by or in any court or governmental authority of competent jurisdiction or any self-regulatory organization having authority over the matters contemplated hereby, which prohibits the consummation of any of the transactions contemplated by this Agreement or the Warrant Agreement.

E. Warrant Agreement. The Company shall have entered into the Warrant Agreement with a warrant agent on terms satisfactory to the Company.

Section 6. Termination. This Agreement may be terminated at any time after June 30, 2025 upon the election by either the Company or the Purchasers upon written notice to the other party if the closing of the Public Offering does not occur prior to such date.

Section 7. Survival of Representations and Warranties. All of the representations and warranties contained herein shall survive each Closing Date.

Section 8. Definitions. Terms used but not otherwise defined in this Agreement shall have the meaning assigned to such terms in the registration statement on Form S-1 the Company has filed with the U.S. Securities and Exchange Commission, under the Securities Act.

Section 9. Miscellaneous.

A. Successors and Assigns. Except as otherwise expressly provided herein, all covenants and agreements contained in this Agreement by or on behalf of any of the parties hereto shall bind and inure to the benefit of the respective successors of the parties hereto whether so expressed or not. Notwithstanding the foregoing or anything to the contrary herein, the parties may not assign this Agreement, other than assignments by the Purchasers to affiliates thereof (including, without limitation one or more of its members).

B. Severability. Whenever possible, each provision of this Agreement shall be interpreted in such manner as to be effective and valid under applicable law, but if any provision of this Agreement is held to be prohibited by or invalid under applicable law, such provision shall be ineffective only to the extent of such prohibition or invalidity, without invalidating the remainder of this Agreement.

C. Counterparts. This Agreement may be executed simultaneously in two or more counterparts, none of which need contain the signatures of more than one party, but all such counterparts taken together shall constitute one and the same agreement.

D. Descriptive Headings; Interpretation. The descriptive headings of this Agreement are inserted for convenience only and do not constitute a substantive part of this Agreement. The use of the word “including” in this Agreement shall be by way of example rather than by limitation.

E. Governing Law. This Agreement shall be deemed to be a contract made under the laws of the State of New York and for all purposes shall be construed in accordance with the internal laws of the State of New York without giving effect to conflicts of law principles that would result in the application of the laws of another jurisdiction.

F. Amendments. This Agreement may not be amended, modified or waived as to any particular provision, except by a written instrument executed by all parties hereto.

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IN WITNESS WHEREOF, the parties hereto have executed this Agreement to be effective as of the date first set forth above.

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