SEC Filing Document

Company: Berto Acquisition Corp. II
Ticker: GUAC
CIK: 2081515
Filing Type: S-1
Document Type: EX-4.3
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_ex4-3.htm

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Exhibit 4.3

[FACE]

Number

Warrants

THIS WARRANT SHALL BE VOID IF NOT EXERCISED PRIOR TO

THE EXPIRATION OF THE EXERCISE PERIOD PROVIDED FOR

IN THE WARRANT AGREEMENT DESCRIBED BELOW

BERTO ACQUISITION CORP. II

Incorporated Under the Laws of the Cayman Islands

CUSIP [___]

Warrant Certificate

This Warrant
Certificate certifies that ________________, or registered assigns, is the registered holder of warrant(s) evidenced hereby
(the “Warrants” and each, a “Warrant”) to purchase ordinary shares, $0.0001 par
value per share (“Ordinary Shares”), of Berto Acquisition Corp. II, a Cayman Islands exempted company (the
“Company”). Each whole Warrant entitles the holder, upon exercise during the period set forth in the
Warrant Agreement referred to below, to receive from the Company that number of fully paid and non-assessable Ordinary Shares as set
forth below, at the exercise price (the “Warrant Price”) as determined pursuant to the Warrant Agreement,
payable in lawful money (or through “cashless exercise” as provided for in the Warrant Agreement) of the
United States of America upon surrender of this Warrant Certificate and payment of the Warrant Price at the office or agency of the
Warrant Agent referred to below, subject to the conditions set forth herein and in the Warrant Agreement. Defined terms used in this
Warrant Certificate but not defined herein shall have the meanings given to them in the Warrant Agreement.

Each whole Warrant is initially exercisable for one fully paid and non-assessable Ordinary Share. No fractional shares will be issued upon exercise of any Warrant. If, upon the exercise of Warrants, a holder would be entitled to receive a fractional interest in an Ordinary Share, the Company will, upon exercise, round down to the nearest whole number the number of Ordinary Shares to be issued to the Warrant holder. The number of Ordinary Shares issuable upon exercise of the Warrants is subject to adjustment upon the occurrence of certain events set forth in the Warrant Agreement.

The Warrant Price per Ordinary
Share for any Warrant is equal to $11.50 per share. The Warrant Price is subject to adjustment upon the occurrence of certain events set
forth in the Warrant Agreement.

Subject to the conditions set forth in the Warrant Agreement, the Warrants may be exercised only during the Exercise Period and to the extent not exercised by the end of such Exercise Period, such Warrants shall become void. The Warrants may be redeemed, subject to certain conditions, as set forth in the Warrant Agreement.

Reference is hereby made to the further provisions of this Warrant Certificate set forth on the reverse hereof and such further provisions shall for all purposes have the same effect as though fully set forth at this place.

This Warrant Certificate shall not be valid unless countersigned by the Warrant Agent, as such term is used in the Warrant Agreement.

This Warrant Certificate shall be governed by and construed in accordance with the internal laws of the State of New York.

BERTO ACQUISITION
CORP. II

Name:

Title:

CONTINENTAL STOCK
TRANSFER & TRUST COMPANY,

as Warrant Agent

Name:

Title:

[Reverse]

The Warrants evidenced by
this Warrant Certificate are part of a duly authorized issue of Warrants entitling the holder on exercise to receive Ordinary Shares
and are issued or to be issued pursuant to a Warrant Agreement dated as of _______________, 2026 (the “Warrant
Agreement”), duly executed and delivered by the Company to Continental Stock Transfer & Trust Company, a New York
corporation, as warrant agent (the “Warrant Agent”), which Warrant Agreement is hereby incorporated by
reference in and made a part of this instrument and is hereby referred to for a description of the rights, limitation of rights,
obligations, duties and immunities thereunder of the Warrant Agent, the Company and the holders (the words
“holders” or “holder” meaning the Registered Holders or Registered Holder,
respectively) of the Warrants. A copy of the Warrant Agreement may be obtained by the holder hereof upon written request to the
Company. Defined terms used in this Warrant Certificate but not defined herein shall have the meanings given to them in the Warrant
Agreement.

Warrants may be exercised at any time during the Exercise Period set forth in the Warrant Agreement. The holder of Warrants evidenced by this Warrant Certificate may exercise them by surrendering this Warrant Certificate, with the form of election to purchase set forth hereon properly completed and executed, together with payment of the Warrant Price as specified in the Warrant Agreement (or through “cashless exercise” as provided for in the Warrant Agreement) at the principal corporate trust office of the Warrant Agent. In the event that upon any exercise of Warrants evidenced hereby the number of Warrants exercised shall be less than the total number of Warrants evidenced hereby, there shall be issued to the holder hereof or his, her or its assignee, a new Warrant Certificate evidencing the number of Warrants not exercised.

Notwithstanding anything
else in this Warrant Certificate or the Warrant Agreement, no Warrant may be exercised unless at the time of exercise (i) a
registration statement on Form S-1, Form S-3, Form F-1 or Form F-3 covering the Ordinary Shares to be issued upon exercise is
effective under the Securities Act of 1933, as amended, and (ii) a prospectus thereunder relating to the Ordinary Shares is current
and such Ordinary Shares are registered, qualified or exempt from registration under the securities, or blue sky, laws of the state
of the residence of the holder, except through “cashless exercise” as provided for in the Warrant Agreement. In
addition, and notwithstanding anything else in this Warrant Certificate or the Warrant Agreement, to the extent that the holder of a
Warrant has delivered a notice contemplated by subsection 3.3.5 of the Warrant Agreement, neither the Company nor the
Warrant Agent shall issue to Holder, and Holder may not acquire, any right it might have to acquire, a number of Ordinary Shares
upon exercise of any Warrant to the extent that, upon such exercise, the number of Ordinary Shares then beneficially owned by Holder
would exceed the Maximum Percentage of Ordinary Shares outstanding immediately after giving effect to such exercise as determined in
accordance with subsection 3.3.5. of the Warrant Agreement.

The Warrant Agreement provides that upon the occurrence of certain events the number of Ordinary Shares issuable upon exercise of the Warrants set forth on the face hereof may, subject to certain conditions, be adjusted. If, upon exercise of a Warrant, the holder thereof would be entitled to receive a fractional interest in an Ordinary Share, the Company shall, upon exercise, round down to the nearest whole number of Ordinary Shares to be issued to the holder of the Warrant.

Warrant Certificates, when surrendered at the principal corporate trust office of the Warrant Agent by the Registered Holder thereof in person or by legal representative or attorney duly authorized in writing, may be exchanged, in the manner and subject to the limitations provided in the Warrant Agreement, but without payment of any service charge, for another Warrant Certificate or Warrant Certificates of like tenor evidencing in the aggregate a like number of Warrants.

Upon due presentation for
registration of transfer of this Warrant Certificate at the office of the Warrant Agent a new Warrant Certificate or Warrant
Certificates of like tenor and evidencing in the aggregate a like number of Warrants shall be issued to the transferee(s) in
exchange for this Warrant Certificate, subject to the limitations provided in the Warrant Agreement, without charge except for any
tax or other governmental charge imposed in connection therewith.

The Company and the Warrant
Agent may deem and treat the Registered Holder(s) hereof as the absolute owner(s) of this Warrant Certificate (notwithstanding any
notation of ownership or other writing hereon made by anyone), for the purpose of any exercise hereof, of any distribution to the
holder(s) hereof, and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the
contrary. Neither the Warrants nor this Warrant Certificate entitles any holder hereof to any rights of a shareholder of the
Company.

Election to Purchase

(To Be Executed Upon Exercise of Warrant)

The undersigned hereby
irrevocably elects to exercise the right, represented by this Warrant Certificate, to receive _____ Ordinary Shares and herewith
tenders payment for such Ordinary Shares to the order of Berto Acquisition Corp. II (the “Company”) in the
amount of $_____________ in accordance with the terms hereof. The undersigned requests that a certificate for such Ordinary Shares
be registered in the name of _____________, whose address is and that such Ordinary Share be delivered to ______________ whose
address is _______________. If said number of Ordinary Share is less than all of the Ordinary Share purchasable hereunder, the
undersigned requests that a new Warrant Certificate representing the remaining balance of such Ordinary Share be registered in the
name of ___________________, whose address is _______________ and that such Warrant Certificate be delivered to _______________,
whose address is _______________.