6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13A-16 OR 15D-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of March 2026

Commission File Number: 001-12102

YPF Sociedad Anónima

(Exact name of registrant as specified in its charter)

Macacha Güemes 515

C1106BKK Buenos Aires, Argentina

(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 ☐

YPF Sociedad Anónima

TABLE OF CONTENT

ITEM 1      Translation of letter to the Argentine Securities Commission dated March 26, 2026.

City of Buenos Aires, March 26, 2026

To the

COMISIÓN NACIONAL DE VALORES (“CNV”)

25 de Mayo 175

Ciudad Autónoma de Buenos Aires

BOLSAS Y MERCADOS ARGENTINOS S.A. (“ByMA”)

Sarmiento 299

Ciudad Autónoma de Buenos Aires

A3 MERCADOS S.A.

Maipú 1210

Ciudad Autónoma de Buenos Aires

Ref.: Filing of Annual Report on Form 20-F.

Dear Sirs,

YPF S.A. informs that it has filed its Annual Report on Form 20-F for the fiscal year ended December 31, 2025, in order to comply with the United States Securities and Exchange Commission (“SEC”) regulations.

The document is posted and available on the SEC’s website (www.sec.gov), and on YPF S. A’s website (www.ypf.com), in the following link: https://investors.ypf.com/financial-information.html

Yours faithfully,

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, thereunto duly authorized.