Form 8-K

8-K — Cartesian Growth Corp III

Accession: 0001104659-26-063291

Filed: 2026-05-18

Period: 2026-05-18

CIK: 0002049662

SIC: 3690 (MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES)

Item: Entry into a Material Definitive Agreement

Item: Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

Item: Financial Statements and Exhibits

Documents

8-K — tm2614914d3_8k.htm (Primary)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT

REPORT

Pursuant to Section 13 or 15(d) of

the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported):

May 18, 2026

Cartesian

Growth Corporation III

(Exact name of registrant as specified in its charter)

Cayman Islands

(State or other jurisdiction

of incorporation)

001-42629

(Commission File Number)

N/A

(I.R.S. Employer

Identification No.)

505

Fifth Avenue, 15th Floor

New York, New York

(Address of principal executive offices)

10017

(Zip Code)

(212)

461-6363

(Registrant’s telephone number, including area code)

Not

Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K

filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities

Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange

Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under

the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under

the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of

the Act:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant

CGCTU

The Nasdaq Stock Market LLC

Class A ordinary shares, par value $0.0001 per share

CGCT

The Nasdaq Stock Market LLC

Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50

CGCTW

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant

is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2

of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging

growth company x

an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying

with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 1.01.      Entry into a Material Definitive Agreement.

The information provided in Item 2.03 of this Current Report

on Form 8-K is incorporated by reference into this Item 1.01.

Item 2.03.      Creation of a Direct Financial Obligation

or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

On May 18, 2026, Cartesian Growth

Corporation III (the “Company”) issued an unsecured promissory note (the “Note”) in the principal amount of $150,000

to CGC III Sponsor LLC (the “Sponsor”). The Note does not bear interest and the principal balance will be payable on the earlier

to occur of (i) the date on which the Company consummates its initial business combination and (ii) the date that the winding up of the

Company is effective (such earlier date, the “Maturity Date”). In the event the Company consummates its initial business combination,

the Sponsor has the option on the Maturity Date to convert all or any portion of the principal outstanding under the Note into that number

of warrants (“Working Capital Warrants”) equal to the portion of the principal amount of the Note being converted divided

by $1.00, rounded up to the nearest whole number. The terms of the Working Capital Warrants, if any, would be identical to the terms of

the private placement warrants issued by the Company at the time of its initial public offering (the “IPO”), as described

in the prospectus for the IPO dated May 5, 2025 and filed with the U.S. Securities and Exchange Commission, including the transfer restrictions

applicable thereto. The Note is subject to customary events of default, the occurrence of certain of which automatically triggers the

unpaid principal balance of the Note and all other sums payable with regard to the Note becoming immediately due and payable.

The issuance of the Note was made pursuant to the exemption

from registration contained in Section 4(a)(2) of the Securities Act of 1933, as amended.

The foregoing

description of the Note is qualified in its entirety by reference to the full text of the Note, a copy of which is filed as Exhibit

10.1 to this Current Report on Form 8-K and incorporated herein by reference.

Item 9.01.      Financial Statements and Exhibits.

(d) Exhibits.

Exhibit

No.

Description

10.1

Promissory Note

issued in favor of CGC III Sponsor LLC, dated May 18, 2026

104

Cover Page Interactive Data

File (embedded within the Inline XBRL document)

SIGNATURE

Pursuant to the requirements of the

Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly

authorized.

CARTESIAN GROWTH CORPORATION

III

By:

/s/ Peter Yu

Name: Peter

Title: Chief

Executive Officer

Date:

May 18, 2026

EX-10.1 — EXHIBIT 10.1

EX-10.1

Filename: tm2614914d3_ex10-1.htm · Sequence: 2

Exhibit 10.1

THIS PROMISSORY NOTE (THIS

“NOTE”) AND THE SECURITIES INTO WHICH THE NOTE MAY BE CONVERTED HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF

1933, AS AMENDED (THE “SECURITIES ACT”), OR UNDER THE SECURITIES LAWS OF ANY STATE. THIS NOTE HAS BEEN ACQUIRED FOR

INVESTMENT ONLY AND THIS NOTE AND THE SECURITIES INTO WHICH THIS NOTE MAY BE CONVERTED MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN

THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM,

SCOPE AND SUBSTANCE TO THE MAKER THAT SUCH REGISTRATION IS NOT REQUIRED.

PROMISSORY NOTE

Principal Amount: $150,000

Dated as of May 18, 2026

Cartesian Growth Corporation

III, a Cayman Islands exempted company (“Maker”), promises to pay to the order of CGC III Sponsor LLC, a Cayman Islands

limited liability company, or its registered assigns or successors in interest (“Payee”), the principal sum of One

Hundred Fifty Thousand Dollars ($150,000) in lawful money of the United States of America, on the terms and conditions described below.

All payments on this Note shall be made by check or wire transfer of immediately available funds or as otherwise determined by Maker to

such account as Payee may from time to time designate by written notice in accordance with the provisions of this Note.

1.       Principal. The principal

balance of this Note shall be payable on the earliest to occur of (i) the date on which Maker consummates its initial business combination

and (ii) the date that the winding up of Maker is effective (such date, the “Maturity Date”). The principal balance

may be prepaid at any time. Under no circumstances shall any individual, including but not limited to any officer, director, employee

or shareholder of Maker, be obligated personally for any obligations or liabilities of Maker hereunder.

2.       Interest. No interest shall accrue

on the unpaid principal balance of this Note.

3.       Drawdown. Upon execution of this Note,

Payee shall fund One Hundred Fifty Thousand Dollars ($150,000).

4.       Application

of Payments. All payments shall first be applied to the payment in full of any costs incurred in connection with the collection of

any sum due under this Note, including (without limitation) reasonable attorney’s fees, then to the payment in full of any late

charges and finally to the reduction of the unpaid principal balance of this Note.

5.       Conversion.

(a)           At

Payee’s option, on the Maturity Date in the event Maker consummates its initial business combination, Payee may elect to convert

all or any portion of the principal outstanding under this Note into that number of warrants (“Working Capital Warrants”)

equal to: (i) the portion of the principal amount of this Note being converted pursuant to this Section 5, divided by (ii) $1.00, rounded

up to the nearest whole number. Each Working Capital Warrant shall have the same terms and conditions as the warrants issued by Maker

pursuant to a private placement to Payee (the “Private Placement”), as described in the prospectus (the “Prospectus”)

for Maker’s initial public offering (the “IPO”) dated May 5, 2025 and filed with the U.S. Securities and Exchange

Commission, including the transfer restrictions applicable thereto. The Working Capital Warrants and the Class A ordinary shares underlying

such warrants, and any other equity security of Maker issued or issuable with respect to the foregoing by way of a share dividend or

share split or in connection with a combination of shares, recapitalization, merger, consolidation or reorganization, shall be entitled

to the registration rights set forth in that certain registration rights agreement among Maker, Payee and the other parties thereto,

dated as of May 5, 2025.

(b)           Upon

any complete or partial conversion of the principal amount of this Note, (i) such principal amount shall be so converted and such

converted portion of this Note shall become fully paid and satisfied, (ii) Payee shall surrender and deliver this Note, duly

endorsed, to Maker or such other address which Maker shall designate against delivery of the Working Capital Warrants, (iii) Maker

shall promptly deliver a new duly executed Note to Payee in the principal amount that remains outstanding, if any, after any such

conversion and (iv) in exchange for all or any portion of the surrendered Note, Maker shall, within five (5) business days following

receipt by Maker of Payee’s election to convert this Note pursuant to this Section 5, deliver to Payee the Working Capital

Warrants, which shall bear such legends as are required in the opinion of counsel to Maker or by any other agreement between Maker

and Payee and applicable state and federal securities laws.

(c)

Payee shall pay any and all issue and other taxes that may be payable with respect to any issue or delivery of the Working Capital

Warrants upon conversion of this Note pursuant hereto; provided, however, that Payee shall not be obligated to pay any transfer

taxes resulting from any transfer requested by Payee in connection with any such conversion.

(d)

The Working Capital Warrants shall not be issued upon conversion of this Note unless such issuance and such conversion comply with

all applicable provisions of law. No fractional warrants shall be issued upon conversion of this Note. For the avoidance of doubt, in

the event that all principal on this Note has been paid in full on or prior to the Maturity Date, then Payee shall not be entitled to

convert any portion of this Note into Working Capital Warrants. Upon conversion of this Note in full, this Note shall be cancelled and

void without further action of Maker or Payee, and Maker shall be forever released from all its obligations and liabilities under this

Note.

6.       Events of Default. The following shall

constitute an event of default (each, an “Event of Default”):

(a)

Failure to Make Required Payments. Failure by Maker to pay the principal amount due pursuant to this Note within five (5)

business days of the date specified in Section 1 above.

(b)

Voluntary Bankruptcy, Etc. The commencement by Maker of a voluntary case under any applicable bankruptcy, insolvency, reorganization,

rehabilitation or other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee,

trustee, custodian, sequestrator (or other similar official) of Maker or for any substantial part of its property, or the making by it

of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking

of corporate action by Maker in furtherance of any of the foregoing.

(c)

Involuntary Bankruptcy, Etc. The entry of a decree or order for relief by a court having jurisdiction in the premises in

respect of Maker in an involuntary case under any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator,

assignee, custodian, trustee, sequestrator (or similar official) of Maker or for any substantial part of its property, or ordering the

winding-up or liquidation of its affairs, and the continuance of any such decree or order unstayed and in effect for a period of 60 consecutive

days.

7.       Remedies. Subject to Section 13 below:

(a)

Upon the occurrence of an Event of Default specified in Section 6(a) hereof, Payee may, by written notice to Maker, declare this

Note to be due immediately and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable hereunder, shall

become immediately due and payable without presentment, demand, protest or other notice of any kind, all of which are hereby expressly

waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding.

(b)            Upon

the occurrence of an Event of Default specified in Sections 6(b) or 6(c), the unpaid principal balance of this Note, and all other sums

payable with regard to this Note, shall automatically and immediately become due and payable, in all cases without any action on the

part of Payee.

8.       Waivers.

Maker and all endorsers and guarantors of, and sureties for, this Note waive presentment for payment, demand, notice of dishonor,

protest, and notice of protest with regard to this Note, all errors, defects and imperfections in any proceedings instituted by

Payee under the terms of this Note, and all benefits that might accrue to Maker by virtue of any present or future laws exempting

any property, real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or

sale under execution, or providing for any stay of execution, exemption from civil process, or extension of time for payment; and

Maker agrees that any real estate that may be levied upon pursuant to a judgment obtained by virtue hereof, on any writ of execution

issued hereon, may be sold upon any such writ in whole or in part in any order desired by Payee.

Unconditional Liability. Maker hereby waives all notices in connection with the delivery, acceptance, performance, default,

or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any

other party, and shall not be affected in any manner by any indulgence, extension of time, renewal, waiver or modification granted or

consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee

with respect to the payment or other provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may

become parties hereto without notice to Maker or affecting Maker’s liability hereunder.

10.     Notices. All notices, statements or

other documents which are required or contemplated by this Note shall be in writing and delivered: (i) personally or sent by first class

registered or certified mail, overnight courier service to the address designated in writing by such party, (ii) by facsimile to the

number most recently provided to such party or such other address or fax number as may be designated in writing by such party or (iii)

by electronic mail, to the electronic mail address most recently provided to such party or such other electronic mail address as may

be designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the day

of delivery, if delivered personally, on the business day following receipt of written confirmation, if sent by facsimile or electronic

mail, one (1) business day after delivery to an overnight courier service or five

(5) days after mailing if sent by mail.

11.

Construction and Governing Law. THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK,

WITHOUT REGARD TO CONFLICT OF LAW PROVISIONS THEREOF.

12.

Severability. Any provision contained in this Note which is prohibited or unenforceable in any jurisdiction shall, as to such

jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof,

and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other

jurisdiction.

13.

Trust Waiver. Notwithstanding anything herein to the contrary, Payee hereby waives any and all right, title, interest or claim

of any kind (“Claim”) in or to any distribution of or from the trust account in which a portion of the proceeds of

the IPO and the Private Placement were deposited, as described in greater detail in the Prospectus, and hereby agrees not to seek recourse,

reimbursement, payment or satisfaction for any Claim against the trust account for any reason whatsoever; provided, however,

that upon the consummation of the initial business combination, Maker shall repay the principal balance of this Note out of the proceeds

released to Maker from the trust account.

14.     Amendment; Waiver. Any amendment hereto or waiver of any provision hereof may be made with, and only with, the written consent of Maker and Payee, except to the extent deemed given by Maker pursuant to Section 8 and 9 above.

15.

Assignment. No assignment or transfer of this Note or any rights or obligations hereunder may be made by any party hereto (by

operation of law or otherwise) without the prior written consent of the other party hereto and any attempted assignment without the required

consent shall be void; provided, however, that the foregoing shall not apply to an affiliate of Payee who agrees to be bound

by the terms of this Note.

[SIGNATURE PAGE FOLLOWS]

IN WITNESS WHEREOF, Maker and

Payee, intending to be legally bound hereby, have caused this Note to be duly executed by the undersigned as of the day and year first

above written.

CARTESIAN GROWTH CORPORATION

III

By:

/s/ Peter Yu

Name:

Peter Yu

Title:

Chief Executive Officer

Acknowledged and Agreed:

CGC III SPONSOR LLC

By:

/s/ Rafael de Luque

Name:

Rafael de Luque

Title:

Manager and Vice President

[Signature Page to Promissory Note]

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dei:tradingSymbolItemType

Balance Type:

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duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

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dei_WrittenCommunications

Namespace Prefix:

dei_

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xbrli:booleanItemType

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- Details

Name:

us-gaap_StatementClassOfStockAxis=CGCT_UnitMember

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- Details

Name:

us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember

Namespace Prefix:

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- Details

Name:

us-gaap_StatementClassOfStockAxis=us-gaap_WarrantMember

Namespace Prefix:

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