SEC Filing Document

Company: Berto Acquisition Corp. II
Ticker: GUAC
CIK: 2081515
Filing Type: S-1
Document Type: EX-4.4
Date Filed: 2026-04-27
Accession Number: 0001829126-26-003952
Exchange: 
SIC Code: 6770
SIC Description: Blank Checks
URL: https://www.sec.gov/Archives/edgar/data/2081515/000182912626003952/bertoacquisition2_ex4-4.htm

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Exhibit 4.4

WARRANT AGREEMENT

THIS
WARRANT AGREEMENT (this “Agreement”), dated as of [•], 2026, is by and between Berto Acquisition
Corp. II, a Cayman Islands exempted company (the “Company”), and Continental Stock Transfer & Trust Company,
a New York corporation, as warrant agent (in such capacity, the “Warrant Agent”, and also referred to herein
as the “Transfer Agent”).

WHEREAS,
the Company is engaged in an initial public offering (the “Offering”) of units of the Company’s equity
securities, each such unit comprised of one ordinary share of the Company, par value $0.0001 per share (“Ordinary Share”),
and one-third of one redeemable Public Warrant (as defined below) (the “Units”) and, in connection therewith,
has determined to issue and deliver up to 8,333,333 warrants (or up to 9,583,333 warrants if the underwriters exercise their right to
purchase additional Units in the Offering (the “Over-Allotment Option”) in full) to public investors in the
Offering (the “Public Warrants”);

WHEREAS,
the Company has entered into that certain Private Placement Warrants Purchase Agreement with Berto Acquisition Sponsor II LLC, a
Cayman Islands limited liability company (the “Sponsor”), pursuant to which the Sponsor agreed to purchase
an aggregate of 3,500,000 warrants (the “Private Placement Warrants”) at a purchase price of $1.00 per Private
Placement Warrant, each bearing the legend set forth in Exhibit A hereto;

WHEREAS,
the Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization
or similar business combination with one or more businesses (a “Business Combination”);

WHEREAS,
in order to finance the Company’s transaction costs in connection with an intended initial Business Combination, the Sponsor or
an affiliate of the Sponsor or the Company’s officers and directors may, but are not obligated to, loan to the Company funds as
the Company may require, of which up to $1,500,000 of such loans may be convertible into up to an additional 1,500,000 private placement
warrants at a price of $1.00 per warrant, which will be identical to the Private Placement Warrants (the “Working Capital
Warrants” and, together with the Private Placement Warrants and the Public Warrants, the “Warrants”);

WHEREAS,
the Company has filed with the U.S. Securities and Exchange Commission (the “Commission”) a registration statement
on Form S-1, File No. 333-[●] (the “Registration Statement”), and a prospectus (the “Prospectus”)
for the registration, under the Securities Act of 1933, as amended (the “Securities Act”), of the Units, the
Public Warrants and the Ordinary Shares included in the Units;

WHEREAS,
each whole Warrant, once it becomes exercisable, entitles the holder thereof to purchase one Ordinary Share for $11.50 per share, subject
to adjustment as described herein. Only whole Warrants are exercisable. A holder of Warrants will not be able to exercise any fraction
of a Warrant;

WHEREAS, the Company desires the Warrant Agent to act on behalf of the Company, and the Warrant Agent is willing to so act, in connection with the issuance, registration, transfer, exchange, redemption and exercise of the Warrants;

WHEREAS, the Company desires to provide for the form and provisions of the Warrants, the terms upon which they shall be issued and exercised, and the respective rights, limitation of rights, and immunities of the Company, the Warrant Agent, and the holders of the Warrants; and

WHEREAS, all acts and things have been done and performed which are necessary to make the Warrants, when executed on behalf of the Company and countersigned by or on behalf of the Warrant Agent, as provided herein, the valid, binding and legal obligations of the Company, and to authorize the execution and delivery of this Agreement.

NOW, THEREFORE, in consideration of the mutual agreements herein contained, the parties hereto agree as follows:

1. Appointment of Warrant Agent. The Company hereby appoints the Warrant Agent to act as agent for the Company for the Warrants, and the Warrant Agent hereby accepts such appointment and agrees to perform the same in accordance with the terms and conditions set forth in this Agreement.

2. Warrants.

2.1 Form of Warrant. Each Warrant shall be issued in registered form only, shall be in substantially the form of Exhibit B hereto, the provisions of which are incorporated herein and shall be signed by, or bear the facsimile signature of, the Chairperson of the Company’s board of directors (the “Board”), President, Chief Executive Officer, Chief Financial Officer, Treasurer, Secretary or other principal officer of the Company. In the event the person whose facsimile signature has been placed upon any Warrant shall have ceased to serve in the capacity in which such person signed the Warrant before such Warrant is issued, it may be issued with the same effect as if he or she had not ceased to be such at the date of issuance.

2.2 Uncertificated Warrants. Notwithstanding anything herein to the contrary, any Warrant may be issued in uncertificated or book-entry form through the Warrant Agent and/or the facilities of The Depository Trust Company (the “Depositary”) or other book-entry depositary system, in each case as determined by the Board or by an authorized committee thereof. Any Warrant so issued shall have the same terms, force and effect as a certificated Warrant that has been duly countersigned by the Warrant Agent in accordance with the terms of this Agreement.

2.3 Effect of Countersignature. Except with respect to uncertificated Warrants as described above, unless and until countersigned by the Warrant Agent pursuant to this Agreement, a Warrant shall be invalid and of no effect and may not be exercised by the holder thereof.

2.4 Registration.

2.4.1 Warrant Register. The Warrant Agent shall maintain books (the “Warrant Register”) for the registration of original issuance and the registration of transfer of the Warrants. Upon the initial issuance of the Warrants, the Warrant Agent shall issue and register the Warrants in the names of the respective holders thereof in such denominations and otherwise in accordance with instructions delivered to the Warrant Agent by the Company.

2.4.2 Registered Holder. Prior to due presentment for registration of transfer of any Warrant, the Company and the Warrant Agent may deem and treat the person in whose name such Warrant is then registered in the Warrant Register (the “Registered Holder”) as the absolute owner of such Warrant and of each Warrant represented thereby (notwithstanding any notation of ownership or other writing on the Warrant made by anyone other than the Company or the Warrant Agent), for the purpose of any exercise thereof, and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary.

2.5 Detachability
of Warrants. The Ordinary Shares and Public Warrants comprising the Units shall begin separate trading on the 52nd day following
the date of the Prospectus or, if such 52nd day is not on a day, other than a Saturday, Sunday or federal holiday, on which banks in
New York City are generally open for normal business (a “Business Day”), then on the immediately succeeding
Business Day following such date, or earlier (the “Detachment Date”) with the consent of Needham & Company,
LLC (“Needham”), as representative of the several underwriters, but in no event will Needham allows separate
trading of the Ordinary Shares and the Public Warrants comprising the Units until (i) the Company has filed a Current Report on Form
8-K which includes an audited balance sheet reflecting the receipt by the Company of the gross proceeds of the Offering including the
proceeds received by the Company from the exercise of the underwriters’ Over-allotment Option, if the Over-allotment Option is
exercised prior to the filing of the Form 8-K, and (ii) the Company has issued a press release announcing when such separate trading
shall begin; provided that no fractional Warrants will be issued upon separation of the Units and only whole Warrants will trade.

2.6 No Fractional Warrants. The Company shall not issue fractional Warrants. If, upon the detachment of the Public Warrants from the Units or otherwise, a holder of Public Warrants would be entitled to receive a fractional Public Warrant, the Company shall round down to the nearest whole number of Warrants to be issued to such holder.