Company: CGCT
Filing Date: 2025-05-01
Form Type: 8-A12B
Source: 0001104659-25-043271
Chunk: 0

Company: Cartesian Growth Corp III
Filing Date: 2025-05-01
Form: 8-A12B
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-A

FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

PURSUANT TO SECTION 12(b) OR (g) OF THE

SECURITIES EXCHANGE ACT OF 1934

Cartesian Growth Corporation III

(Exact name of registrant as specified in its charter)</div>

| Cayman Islands                                                 |     |                                 N/A |
| (State or other jurisdiction of incorporation or organization) |     | -I.R.S. Employer Identification No. |
| 505 Fifth Avenue, 15th Floor                                   
 New York, New York                                             |     |                               10017 |
| (Address of principal executive offices)                       |     |                           -Zip Code |

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

| Title of each class                                                                         
 to be registered                                                                            |     | Name of each exchange on which 
 each class is to be registered |
| Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant |     | The Nasdaq Stock Market LLC    |
| Class A ordinary shares, par value $0.0001 per share                                        |     | The Nasdaq Stock Market LLC    |
| Warrants, each whole warrant exercisable for one Class A ordinary                           
 share at an exercise price of $11.50                                                        |     | The Nasdaq Stock Market LLC    |

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c) or (e), check the following box.x

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d) or (e), check the following box.¨

If this form relates to the registration of a class of securities concurrently with a Regulation A offering, check the following box.¨

| Securities Act registration statement or Regulation A offering statement file number to which this form relates: |     | 333-284565     |
|                                                                                                                  |     | -If applicable |

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

| N/A              |
| (Title of Class) |

| Item 1. | Description of Registrant’s Securities to be Registered. |

The