SEC Filing Document

Company: Berto Acquisition Corp. II
Ticker: GUAC
CIK: 2081515
Filing Type: S-1
Document Type: EX-10.1
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_ex10-1.htm

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Exhibit 10.1

LETTER AGREEMENT

Berto Acquisition Corp. II

1180 North Town Center Drive, Suite 100

Las Vegas, NV 89144

Re: Initial Public Offering

Ladies and Gentlemen:

This letter (this “Letter Agreement”)
is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered
into by and among Berto Acquisition Corp. II, a Cayman Islands exempted company (the “Company”), and Needham
& Company, LLC, as representative (the “Representative”) of the underwriters (the “Underwriters”),
relating to an underwritten initial public offering (the “Public Offering”), of up to 28,750,000 of the Company’s
units (including up to 3,750,000 units that may be purchased to cover over-allotments, if any) (the “Units”),
each comprised of one of the Company’s ordinary shares, par value $0.0001 per share (the “Ordinary Shares”),
and one-third of one redeemable warrant. Each whole warrant (each, a “Warrant”) entitles the holder thereof
to purchase one Ordinary Share at a price of $11.50 per whole Warrant, subject to adjustment as described in the Prospectus (as defined
below). The Units will be sold in the Public Offering pursuant to a registration statement on Form S-1 and prospectus (the “Prospectus”)
filed by the Company with the U.S. Securities and Exchange Commission (the “Commission”) and the Company has
applied to have the Units listed on The Nasdaq Global Market. Certain capitalized terms used herein are defined in paragraph 11 hereof.

In order to induce the Company and the Underwriters
to enter into the Underwriting Agreement and to proceed with the Public Offering and for other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, each of Berto Acquisition Sponsor II LLC (the “Sponsor”),
Meteora Capital, LLC (the “Consultant”), and the undersigned individuals or entities, each of whom is either
a member of the Company’s board of directors and/or management team (each such individuals, an “Insider”
and collectively, the “Insiders”) or an investor who has entered into a subscription agreement with the Company
(each such entities/individuals, an “Investor” and collectively, the “Investors”),
hereby agrees with the Company as follows:

1.	(1)	The Sponsor, each Insider and each Investor agrees that if the Company seeks shareholder approval of a proposed Business Combination,
then in connection with such proposed Business Combination, it, he or she shall (i) vote any Ordinary Shares (as defined below) owned
by it, him or her in favor of any proposed Business Combination (including any proposals recommended by the Company’s board of
directors in connection with such Business Combination) and (ii) not redeem any Ordinary Shares owned by it, him or her in connection
with such shareholder approval. If the Company seeks to consummate a proposed Business Combination by engaging in a tender offer, the
Sponsor, each Insider and each Investor agrees that it, he or she will not sell or tender to the Company any Ordinary Shares owned by
it, him or her in connection therewith.

(2)	The Consultant agrees that if the Company seeks shareholder
approval of a proposed Business Combination, then in connection with such proposed Business Combination, it shall (i) vote any Founder
Shares (as defined below) owned by it in favor of any proposed Business Combination (including any proposals recommended by the Company’s
board of directors in connection with such Business Combination) and (ii) not redeem any Founder Shares owned by it in connection with
such shareholder approval. If the Company seeks to consummate a proposed Business Combination by engaging in a tender offer, the Consultant
agrees that it will not sell or tender to the Company any Founder Shares owned by it in connection therewith. For purposes of clarity,
any shares or units purchased by the Consultant in the Company’s Public Offering or public aftermarket are not subject to the restrictions
described in this paragraph 1(2).

2.	The Sponsor, each Insider
and each Investor hereby agrees that in the event that the Company fails to consummate a
Business Combination within 24 months from the closing of the Public Offering (or 27 months
from the closing of the Public Offering if the Company has executed a letter of intent, agreement
in principle or definitive agreement for an initial business combination within 24 months
from the closing of the Public Offering), or such later period approved by the Company’s
shareholders in accordance with the Company’s amended and restated memorandum and articles
of association (as it may be amended from time to time, the “ Charter ”),
the Sponsor, each Insider and each Investor shall take all reasonable steps to cause the
Company to as promptly as reasonably possible but not more than ten (10) business days thereafter,
redeem 100% of the then outstanding Ordinary Shares sold as part of the Units in the Public
Offering (the “ Offering Shares ”), at a per-share price, payable
in cash, equal to the aggregate amount then on deposit in the Trust Account (as defined below),
including interest earned on the funds held in the Trust Account (which interest shall be
net of taxes paid or payable and less up to $100,000 of interest to pay dissolution expenses),
divided by the number of then outstanding Offering Shares, which redemption will constitute
full and complete payment for the Offering Shares and completely extinguish all Public Shareholders’
(as defined below) rights as shareholders (including the right to receive further liquidating
or other distributions, if any), subject to applicable law. The Sponsor, the Consultant,
each Insider and each Investor agrees to not propose any amendment to the Charter (A) to
modify the substance or timing of the Company’s obligation to allow redemption in connection
with a Business Combination or to redeem 100% of the Offering Shares if the Company does
not complete a Business Combination within the required time period set forth in the Charter
or (B) with respect to any other material provisions relating to the rights of holders of
Ordinary Shares or pre-initial Business Combination activity, unless the Company provides
its Public Shareholders with the opportunity to redeem their Offering Shares upon approval
of any such amendment at a per-share price, payable in cash, equal to the aggregate amount
then on deposit in the Trust Account, including interest earned on the funds held in the
Trust Account (which interest shall be net of taxes paid or payable), divided by the number
of then outstanding Offering Shares.

3.	The Sponsor, the Consultant, each Insider and each Investor
acknowledges that it, he or she has no right, title, interest or claim of any kind in or to any monies held in the Trust Account with
respect to the Founder Shares held by it, him or her. The Sponsor, each Insider and each Investor hereby further waives, with respect
to any Ordinary Shares held by it, him or her, if any, and the Consultant hereby further waives, with respect to any Founder Shares held
by it, any redemption rights it, he or she may have in connection with (a) the consummation of a Business Combination or an earlier redemption
in connection with the commencement of procedures to consummate a Business Combination if the Company determines it is desirable to facilitate
the completion of such Business Combination, including, without limitation, any such rights available in the context of a shareholder
vote to approve such Business Combination, or (b) a shareholder vote to approve an amendment to the Charter (A) to modify the substance
or timing of the Company’s obligation to allow redemption in connection with a Business Combination or to redeem 100% of the Offering
Shares if the Company has not consummated a Business Combination within the time period set forth in the Charter or (B) with respect
to any other material provisions relating to rights of holders of Ordinary Shares or pre-initial Business Combination activity or in
the context of a tender offer made by the Company to purchase Offering Shares. Notwithstanding the foregoing, the Sponsor, the Consultant,
the Insiders, the Investors and their respective affiliates shall be entitled to redemption and liquidation rights with respect to any
Offering Shares it or they hold if the Company fails to consummate a Business Combination within the time period set forth in the Charter.
For purposes of clarity, the Consultant is not waiving any redemption right or claim to funds held in the Trust Account relating to a
redemption or liquidation rights for any shares or units purchased it may purchase in the Company’s Public Offering or public aftermarket
unless otherwise provided in other agreements.