SEC Filing Document

Company: Berto Acquisition Corp. II
Ticker: GUAC
CIK: 2081515
Filing Type: S-1
Document Type: EX-4.2
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_ex4-2.htm

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Exhibit 4.2

NUMBER
C-	SHARES

SEE REVERSE FOR CERTAIN DEFINITIONS

CUSIP [●]

BERTO ACQUISITION CORP. II

ORDINARY SHARES

THIS CERTIFIES THAT is the
owner of fully paid non-assessable ordinary shares, par value $0.0001 per share (each, an “Ordinary
Share”), of Berto Acquisition Corp. II, a Cayman Islands exempted company (the “Company”),
subject to the Company’s amended and restated memorandum and articles of association (the “Memorandum and
Articles”) as the same may be amended from time to time, and transferable on the books of the Company in person or by
duly authorized attorney upon surrender of this certificate properly endorsed.

This certificate is not valid unless countersigned by the Transfer Agent and recorded in the register of members of the Company.

Witness the facsimile signature of a duly authorized signatory of the Company.

Authorized Signatory Transfer Agent

Berto Acquisition Corp. II

The Company will furnish without charge to each shareholder who so requests, a statement of the powers, designations, preferences and relative, participating, optional or other special rights of each class of equity or series thereof of the Company and the qualifications, limitations, or restrictions of such preferences and/or rights. This certificate and the shares represented thereby are issued and shall be held subject to all the provisions of the Memorandum and Articles and resolutions of the Board of Directors providing for the issue of securities, to all of which the holder of this certificate by acceptance hereof assents.

The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM	—	as tenants in common UNIF GIFT MIN ACT	— Custodian

(Cust) (Minor)

TEN ENT	—	as tenants by the entireties

Under Uniform Gifts to Minors Act

JT TEN	—	as joint tenants with right of survivorship and not as tenants in common

(State)

Additional abbreviations may also be used though not in the above list.

For value received, hereby sells, assigns and transfers unto

(PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER(S) OF ASSIGNEE(S))

(PLEASE PRINT OR TYPEWRITE NAME(S) AND ADDRESS(ES), INCLUDING ZIP CODE, OF ASSIGNEE(S))

Ordinary Shares represented by the within certificate, and do hereby irrevocably constitute and appoint Attorney to transfer the said Ordinary Shares on the books of the within named Company with full power of substitution in the premises.

Dated

Notice:	The signature to this assignment must correspond with the name as written upon the face of the certificate in every particular, without alteration or enlargement or any change whatever.

Signature(s) Guaranteed:

THE SIGNATURE(S) MUST 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)).

As more fully described
in, and subject to the terms and conditions described in, the Company’s final prospectus for its initial public offering dated
[●], the holder(s) of this certificate shall be entitled to receive a pro-rata portion of certain funds held in the trust account
established in connection with the Company’s initial public offering in the event that (i) the Company redeems the Ordinary
Shares sold in its initial public offering and liquidates because it does not consummate an initial business combination within the
time period set forth in the Company’s Memorandum and Articles, as the same may be amended from time to time, or (ii) if the
holder(s) properly redeem for cash his, her or its respective Ordinary Shares represented by this certificate in connection with (x)
a tender offer (or proxy solicitation, solely in the event the Company seeks shareholder approval of the proposed initial business
combination) setting forth the details of a proposed initial business combination or (y) a shareholder vote to amend the Memorandum
and Articles (A) to modify the substance or timing of the Company’s obligation to allow redemption in connection with the
Company’s initial business combination or to redeem 100% of the Ordinary Shares if it does not consummate an initial business
combination within the time set forth in the Memorandum and Articles, as the same may be amended from time to time or (B) with
respect to any other material provisions relating the rights of holders of Ordinary Shares or pre-initial Business Combination (as
defined in the Memorandum and Articles) activity. In no other circumstances shall the holder(s) have any right or interest of any
kind in or to the trust account.