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): August 14, 2026

CARTESIAN GROWTH CORPORATION IV
(Exact name of registrant as specified in its charter)

(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:

Securities registered pursuant to Section 12(b) of the Act:

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 ☒

If 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 8.01. Other Events.

On August 14, 2026, Cartesian Growth Corporation IV (the “Company”) issued a press release, a copy of which is filed as Exhibit 99.1 to this Current Report on Form 8-K (this “Report”), announcing that, commencing on or about Monday, August 17, 2026, holders of the units sold in the Company’s initial public offering may elect to separately trade the Class A ordinary shares and warrants included in the units. The Class A ordinary shares and warrants that are separated are expected to trade on the Nasdaq Global Market (“Nasdaq”) under the symbols “CGCF” and “CGCFW”, respectively. Any units not separated will continue to trade on Nasdaq under the symbol “CGCFU”. No fractional warrants will be issued upon separation of the units and only whole warrants will trade. Each holder of units will need to have its broker contact Continental Stock Transfer & Trust Company, the Company’s transfer agent, in order to separate the units into Class A ordinary shares and warrants.

Forward-Looking Statements 

This Report includes “forward-looking statements” within the meaning of the safe harbor provisions of the United States Private Securities Litigation Reform Act of 1995. Certain of these forward-looking statements can be identified by the use of words such as “believes,” “expects,” “intends,” “plans,” “estimates,” “assumes,” “may,” “should,” “will,” “seeks,” or other similar expressions. Such statements may include, but are not limited to, statements regarding the unit separation and the trading of the Company’s securities on Nasdaq. These statements are based on current expectations on the date of this Report and involve a number of risks and uncertainties that may cause actual results to differ significantly, including those risks set forth in the final prospectus for the Company’s initial public offering and other documents filed by the Company with the Securities and Exchange Commission (the “SEC”). Copies of such filings are available on the SEC’s website at www.sec.gov. The Company does not assume any obligation to update or revise any such forward-looking statements, whether as the result of new developments or otherwise. Readers are cautioned not to put undue reliance on forward-looking statements.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

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.

Date: August 14, 2026