Company: VIST
Filing Date: 2025-09-15
Form Type: 6-K
Source: 0001193125-25-203571
Chunk: 0

Company: Vista Energy, S.A.B. de C.V.
Filing Date: 2025-09-15
Form: 6-K
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER

PURSUANT TO RULE 13a-16OR 15d-16

UNDER SECURITIES EXCHANGE ACT OF 1934

For the month of September 2025

Commission File No. 001-39000

Vista Energy, S.A.B. de C.V.

(Exact Name of the Registrant as Specified in the Charter)

N.A.

(Translation of Registrant’s Name into English)

Torre Mapfre,

243 Paseo de la Reforma Avenue, 18 thFloor

Cuauhtémoc, Alcaldía Cuauhtémoc

06500, Mexico City

Mexico

(Address of Principal Executive Office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

Advance Notice of 3rd Quarter of 2025 Results

Mexico City, September 15, 2025 — Vista Energy, S.A.B. de C.V. (“Vista” or the “Company”) (NYSE: VIST; BMV: VISTA)
announced today that it will release its consolidated financial statements for the third quarter of 2025 on Wednesday, October 22, 2025, after market closes.

The Company will present the results through a webcast on Thursday, October 23, 2025, at 8:00 am Mexico City time (10:00 am ET; 11:00 am BAT).

The webcast will be accessible on the Company’s website, at .

Forward-Looking Statements

Any statements contained
herein or in the attachments hereto regarding Vista that are not historical or current facts are forward-looking statements. These forward-looking statements convey Vista’s current expectations or forecasts of future events. Forward-looking
statements regarding Vista involve known and unknown risks, uncertainties and other factors that may cause Vista’s actual results, performance or achievements to be materially different from any future results, performances or achievements
expressed or implied by the forward-looking statements. Certain of these risks and uncertainties are described in the “Risk Factors,” “Forward-Looking Statements” and other applicable sections of Vista’s annual report
filed with the United States Securities and Exchange Commission (“SEC”) on Form 20-F and other applicable filings with