Company: VIST
Filing Date: 2025-04-16
Form Type: 6-K
Source: 0001193125-25-082223
Chunk: 63

Company: Vista Energy, S.A.B. de C.V.
Filing Date: 2025-04-16
Form: 6-K
Chunk 63
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, S.A.B. de C.V., and |

| • |     | Vista Energy Argentina S.A.U. |

Jurisdiction and Applicable Law The Convertible Note Agreement and any dispute or claim arising out of or in connection with it shall be governed by and construed in accordance with the laws of England and Wales. All disputes shall be settled by arbitration in London in accordance with the Arbitration Rules of the ICC. The arbitration shall be conducted in English and the award shall be final and binding on the parties. 52

RESPONSIBLE PARTIES

“We, the undersigned, declare under oath that, within the scope of our respective functions, we have prepared the information regarding the issuer
contained in this disclosure document, which, to the best of our knowledge and belief, reasonably reflects its situation. We also state that we are not aware of any material information that has been omitted or misrepresented in this disclosure
document or that this disclosure document contains information that could mislead investors.”

/s/ Miguel Galuccio

Miguel Galuccio

Chief Executive
Officer

/s/ Pablo Vera Pinto

Pablo Vera Pinto

Chief Financial
Officer

/s/ Javier Rodríguez Galli

Javier Rodríguez Galli

General Counsel

EXHIBITS

1. PRO FORMA FINANCIAL STATEMENTS AND REPORT OF THE INDEPENDENT PUBLIC ACCOUNTANT ON THE COMPILATION OF THE PRO FORMA FINANCIAL INFORMATION TO BE INCLUDED IN THE DISCLOSURE DOCUMENT

54

1. PRO FORMA FINANCIAL STATEMENTS AND REPORT OF THE INDEPENDENT PUBLIC ACCOUNTANT ON THE COMPILATION OF THE PRO FORMA FINANCIAL INFORMATION TO BE INCLUDED IN THE DISCLOSURE DOCUMENT

55

VISTA ENERGY, S.A.B. DE C.V.

Unaudited pro forma consolidated financial statements as of December 31, 2024,

and for the year ended December 31, 2024

VISTA ENERGY, S.A.B. DE C.V. Unaudited pro forma consolidated financial statements as of December 31, 2024, and for the year ended December 31, 2024 TABLE OF CONTENTS

| • |     | Independent public accountant’s report on the compilation of proforma financial information to be included 
 in the disclosure document                                                                                 |

REPORT OF THE INDEPENDENT PUBLIC ACCOUNTANT ON THE COMPILATION OF THE PROFORMA FINANCIAL INFORMATION TO BE INCLUDED IN THE DISCLOSURE DOCUMENT

To the Shareholders