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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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 _______________.

In the event that the
Warrant has been called for redemption by the Company pursuant to Section 6.1 of the Warrant Agreement and the Company has
required cashless exercise pursuant to Section 6.3 of the Warrant Agreement, the number of Ordinary Share that this Warrant
is exercisable for shall be determined in accordance with subsection 3.3.1(b) and Section 6.3 of the Warrant
Agreement.

In the event that the
Warrant is a Private Placement Warrant to be exercised on a “cashless” basis pursuant to subsection 3.3.1(c) of
the Warrant Agreement, the number of Ordinary Share that this Warrant is exercisable for shall be determined in accordance with subsection
3.3.1(c) of the Warrant Agreement.

In the event that the
Warrant may be exercised, to the extent allowed by the Warrant Agreement, through cashless exercise (i) the number of Ordinary Share
that this Warrant is exercisable for would be determined in accordance with the relevant section of the Warrant Agreement which
allows for such cashless exercise and (ii) the holder hereof shall complete the following: The undersigned hereby irrevocably elects
to exercise the right, represented by this Warrant Certificate, through the cashless exercise provisions of the Warrant Agreement,
to receive Ordinary Share. If said number of Ordinary Share is less than all of the Ordinary Share purchasable hereunder (after
giving effect to the cashless exercise), 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 ________________.

By signing this Election to
Purchase, the undersigned hereby certifies that such election will not result in the undersigned beneficially owning Ordinary Shares
in excess of the [4.9%] Cap outlined in Section 3.3.5 of the Warrant Agreement.

[To be included in any Election to Purchase of a holder who has provided the notice set forth in subsection 3.3.5 of the Warrant Agreement.

By signing this Election to Purchase, the undersigned hereby certifies that upon after giving effect to such exercise, the undersigned (together with such person’s affiliates) or any “group” of which holder or its affiliates is a member, would not beneficially own in excess of the Maximum Percentage of the Ordinary Shares outstanding immediately after giving effect to such exercise as determined in accordance with subsection 3.3.5. of the Warrant Agreement.]

[Signature Page Follows]

Date: ____________, 20___

Signature Guaranteed:

THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN
ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED
SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED (OR ANY
SUCCESSOR RULE)).