Company: VIST
Filing Date: 2025-12-03
Form Type: 6-K
Source: 0001193125-25-306998
Chunk: 0

Company: Vista Energy, S.A.B. de C.V.
Filing Date: 2025-12-03
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 December 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

Colonia 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 ☐

Issuance of notes under New York law by Vista Energy Argentina S.A.U., the Company’s main subsidiary

Mexico City, México, December 3, 2025 - Vista Energy, S.A.B. de C.V. (the “” or “”) (BMV: VISTA,
NYSE: VIST) announces to investors that it has completed the pricing of U.S.$400,000,000 in aggregate principal amount of the 8.500% senior notes due 2033 (the “”) of Vista Energy Argentina S.A.U. (“”), at an issue price of 101.236%, equivalent to a yield to average life of 8.250%, which will be governed by New York law. Vista Argentina is the Company’s main subsidiary. The offering is expected to close on
December 10, 2025.

The Notes are being issued as additional notes of Vista Argentina’s previously issued U.S.$500,000,000 8.500% senior notes
due 2033 (the “” and, together with the Notes, the “”). The Notes will have the same terms in all respects as the Initial Notes (except with respect to the date of issuance, initial
issuance price and first interest payment date), will be treated as part of the same series of securities as the Initial Notes under the indenture governing the 2033 Notes and will be fully fungible and vote as one class with the Initial Notes