Cartesian Growth Corp IV (CGCFU) sponsor forfeits 312,500 Class B founder shares

Rhea-AI Filing Summary

CGC IV Sponsor LLC reported disposition transactions in this Form 4 filing.

CGC IV Sponsor LLC, a major holder of Cartesian Growth Corp IV founder shares, reported the forfeiture of 312,500 Class B ordinary shares to the company at no cost. The forfeiture occurred in connection with the expiration of the remaining portion of the underwriters' over-allotment option as of August 8, 2026. Following this restructuring transaction, the Sponsor holds 6,775,000 Class B ordinary shares, which are automatically convertible into Class A ordinary shares on a one-for-one basis. Peter Yu may be deemed to share voting and dispositive control over the Sponsor’s holdings but disclaims beneficial ownership except to the extent of his pecuniary interest.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider CGC IV Sponsor LLC, Yu Peter

Role 10% Owner | Chairman and CEO

Type	Security	Shares	Price	Value
Other	Class B ordinary shares F1, F2, F3	312,500	$0.00	$0.00

Holdings After Transaction: Class B ordinary shares — 6,775,000 shares (Direct)

Footnotes (3)

1. F1. As described in the Issuer's registration statement on Form S-1 (File No. 333- 296614) under the heading "Description of Securities--Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to certain adjustments described therein and have no expiration date.
2. F2. 312,500 Class B ordinary shares were forfeited by CGC IV Sponsor LLC (the "Sponsor") to the Issuer at no cost in connection with the expiration of the remaining portion of the underwriters' over-allotment option as of August 8, 2026, as described in the Registration Statement.
3. F3. These Class B ordinary shares are held by the Sponsor and were acquired pursuant to a securities purchase agreement by and between the Sponsor and the Issuer. CGC IV Sponsor Manager LLC is the sole member of the Sponsor and is controlled by Peter Yu. Consequently, Mr. Yu may be deemed to share voting and dispositive control over the securities held by the Sponsor, and thus to share beneficial ownership of such securities. Mr. Yu disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

Key Figures

Class B shares forfeited: 312,500 Class B ordinary shares Class B shares held after transaction: 6,775,000 Class B ordinary shares Underlying Class A shares: 312,500 Class A ordinary shares

3 metrics

Class B shares forfeited 312,500 Class B ordinary shares Forfeited to issuer at no cost upon expiration of underwriters' over-allotment option as of August 8, 2026

Class B shares held after transaction 6,775,000 Class B ordinary shares Held directly by CGC IV Sponsor LLC following the reported restructuring transaction

Underlying Class A shares 312,500 Class A ordinary shares Underlying the forfeited Class B ordinary shares on a one-for-one conversion basis

Key Terms

over-allotment option, Founder Shares, beneficial ownership, dispositive control

4 terms

over-allotment option financial

"expiration of the remaining portion of the underwriters' over-allotment option as of August 8, 2026"

An over-allotment option is a special agreement that allows underwriters to sell more shares than initially planned if demand is high. Think of it like a retailer offering extra units of a popular product to meet additional customer interest. This option helps ensure the full sale is completed and can also give investors extra shares if they want more.

Founder Shares financial

"under the heading "Description of Securities--Founder Shares", the Class B ordinary shares will automatically convert"

Founder shares are the ownership stakes given to the people who start a company, often with extra voting power or protections compared with ordinary shares. For investors, they matter because founders’ control and incentives influence decisions about strategy, hiring, and whether the company sells or stays independent — like a family that keeps majority voting rights in a household decision. High founder ownership can mean stable leadership but also a risk that outside shareholders have less influence.

beneficial ownership financial

"Mr. Yu may be deemed to share voting and dispositive control and thus to share beneficial ownership"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

dispositive control financial

"Consequently, Mr. Yu may be deemed to share voting and dispositive control over the securities"

FAQ

What did CGC IV Sponsor LLC report in this Form 4 for CGCFU?

CGC IV Sponsor LLC reported forfeiting 312,500 Class B ordinary shares of Cartesian Growth Corp IV to the issuer at no cost, tied to the expiration of the underwriters' over-allotment option on August 8, 2026.

How many Class B shares does the Sponsor hold after this CGCFU transaction?

After the forfeiture, the Sponsor holds 6,775,000 Class B ordinary shares. These shares are automatically convertible into Class A ordinary shares on a one-for-one basis in connection with the company’s initial business combination or earlier at the holder’s option.

Why were 312,500 Class B shares disposed of in Cartesian Growth Corp IV (CGCFU)?

The 312,500 Class B ordinary shares were forfeited to Cartesian Growth Corp IV at no cost in connection with the expiration of the remaining portion of the underwriters' over-allotment option as of August 8, 2026, as described in the company’s registration statement.

How are Cartesian Growth Corp IV (CGCFU) Class B founder shares treated?

The Class B founder shares automatically convert into Class A ordinary shares at the time of the initial business combination, or earlier at the holder’s option, on a one-for-one basis, subject to adjustments described in the registration statement, and have no expiration date.

What is Peter Yu’s beneficial ownership status in this CGCFU Form 4?

The Sponsor’s holdings are controlled by an entity controlled by Peter Yu, so he may be deemed to share voting and dispositive control. However, he disclaims beneficial ownership of the securities except to the extent of his pecuniary interest.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/11/2026 - 10:16 AM Accepted by SEC EDGAR 08/11/2026 - 10:16 AM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

CGC IV Sponsor LLC

(Last) (First) (Middle)

505 FIFTH AVENUE, 15TH FLOOR

(Street)

NEW YORK NEW YORK 10017

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Cartesian Growth Corp IV [ CGCF ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Class B ordinary shares	(1)	08/08/2026		J(2)			312,500	(1)	(1)	Class A ordinary shares	312,500	$0	6,775,000(3)	D

1. Name and Address of Reporting Person^*

CGC IV Sponsor LLC

(Last) (First) (Middle)

505 FIFTH AVENUE, 15TH FLOOR

(Street)

NEW YORK NEW YORK 10017

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Yu Peter

(Last) (First) (Middle)

505 FIFTH AVENUE, 15TH FLOOR

(Street)

NEW YORK NEW YORK 10017

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman and CEO

Explanation of Responses:

1. As described in the Issuer's registration statement on Form S-1 (File No. 333- 296614) under the heading "Description of Securities--Founder Shares", the Class B ordinary shares will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to certain adjustments described therein and have no expiration date.

2. 312,500 Class B ordinary shares were forfeited by CGC IV Sponsor LLC (the "Sponsor") to the Issuer at no cost in connection with the expiration of the remaining portion of the underwriters' over-allotment option as of August 8, 2026, as described in the Registration Statement.

3. These Class B ordinary shares are held by the Sponsor and were acquired pursuant to a securities purchase agreement by and between the Sponsor and the Issuer. CGC IV Sponsor Manager LLC is the sole member of the Sponsor and is controlled by Peter Yu. Consequently, Mr. Yu may be deemed to share voting and dispositive control over the securities held by the Sponsor, and thus to share beneficial ownership of such securities. Mr. Yu disclaims beneficial ownership of such securities except to the extent of its or his pecuniary interest therein.

	/s/ Thomas Martin, Attorney-in-Fact	08/11/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)