YPF Sociedad Anonima

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of September 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 September 7, 2026.

Buenos Aires, September 7, 2026. Gentlemen COMISIÓN NACIONAL DE VALORES ("CNV") 25 de Mayo 175 City of Buenos Aires A3 MERCADOS S.A. ("A3 MERCADOS") Maipu 1210 City of Buenos Aires BOLSAS Y MERCADOS ARGENTINOS S.A. ("ByMA") Sarmiento 299 City of Buenos Aires Present Ref : YPF S.A. - Tender Offers Our highest consideration: I am pleased to write to you in my capacity as Head of Market Relations at YPF S.A. (the "Company") (CUIT 30-54668997-9), for the purpose of complying with the requirements of the Argentine Securities Commission and the corresponding rules of ByMA and A3 Mercados. YPF is launching two cash tender offers (each, a "Tender Offer,"and collectively, the"Tender Offers") to purchase (i) the 6.950% Class LIII Negotiable Obligations due 2027 (the "2027 Notes") and (ii) the Class XVII Negotiable Obligations with a step-up rate of 2.500%/9.000% due 2029 (the "2029 Notes"and, together with the 2027 Notes, the"Eligible Notes"), which are validly tendered and not withdrawn prior to the expiration date of the Tender Offers, and which are accepted for purchase by YPF in accordance with the terms and conditions set forth in the offer to purchase dated as of the date hereof, for a total cash consideration of up to US$500,000,000, excluding Accrued Interest (the "Maximum Purchase Price"). In addition, concurrently, YPF is offering Class XLIV Negotiable Obligations in a primary offering, in accordance with the terms and conditions applicable to such issuance. The Tender Offers are subject to certain conditions, which are described in detail in the Offer to Purchase published on this same date. In this regard, please find attached the press release regarding the launch of the Tender Offers. Sincerely yours,

Margarita Chun Market Relations Officer YPF S.A.

YPF Sociedad Anónima (a stock corporation ( sociedad anónima ) incorporated under the laws of Argentina) YPF Sociedad Anónima Announces Commencement of Tender Offers for up to U.S.$500,000,000 Maximum Purchase Price of Outstanding Securities of the Series Listed Below, subject to the Priorities Set Forth Herein Buenos Aires, September 7, 2026 - YPF Sociedad Anónima ("YPF") today announced that it has commenced cash tender offers (each a "Tender Offer" and, collectively, the "Tender Offers") to purchase outstanding securities listed in the table below (the "Securities") not to exceed U.S.$500,000,000 in the aggregate, excluding any Accrued Interest (the "Maximum Purchase Price"). Title of Security CUSIP and ISIN Numbers Principal Amount Outstanding Acceptance Priority Level Consideration (a) 6.950% Senior Notes due 2027 CUSIP: 984245 AQ3 P989MJ BL4 ISIN: US984245AQ34 USP989MJBL47 U.S.$643,428,000 1 U.S.$1,017.50 2.500%/9.000% Step Up Amortizing Notes due 2029 CUSIP: P989MJ BS9 984245 AV2 ISIN: USP989MJBS99 US984245AV29 U.S.$640,999,934 (b) 2 U.S.$1,042.00

_______________ (a) Per U.S.$1,000 principal amount. (b) Outstanding principal amount as of the date of this press release corresponds to the application of the amortization factor of 0.85714 multiplied by the original principal amount of the 2029 Securities (as defined below) shown in the records of the DTC (as defined below). The original principal amount of the 2029 Securities before the application of the amortization factor is U.S.$747,833,257. The Tender Offers are subject to the terms and conditions set forth in YPF's Offer to Purchase dated the date hereof (the "Offer to Purchase"), including the concurrent or earlier consummation of a new notes offering that provides YPF with sufficient funds to meet the obligations of YPF in connection with the Tender Offers. The Tender Offers are also subject to the acceptance priority procedures and proration, as described in the Offer to Purchase (the "Acceptance Priority Procedures"). Under the Acceptance Priority Procedures, Securities will be accepted for purchase according to the Acceptance Priority Level set forth in the table above, beginning with the lowest numerical value first. When considering any potential allocation of New Notes in the New Notes Offering, YPF intends, but is not obligated, to give some degree of preference to those investors who, prior to such allocation, have validly tendered, or have indicated to YPF or the Dealer Managers (as defined below) their firm intention to tender, Securities in the Tender Offers. The Offer to Purchase more fully sets forth the terms of the Tender Offers. The Tender Offers are scheduled to expire at 5:00 p.m., New York City time (6:00 p.m. Buenos Aires time), on Wednesday, September 16, 2026, unless extended or earlier terminated (such date and time, as it may be extended with respect to the Tender Offers, the "Expiration Date"). Holders of Securities ("Holders") may participate in the Tender Offers by validly tendering and not validly withdrawing their Securities by the Expiration Date.

Securities validly tendered pursuant to the Tender Offers may be withdrawn at any time at or prior to 5:00 p.m., New York City time (6:00 p.m. Buenos Aires time), on Wednesday, September 16, 2026 (such date and time, as it may be extended with respect to the Tender Offers, the "Withdrawal Deadline"), but not thereafter. The Withdrawal Deadline for the Tender Offers is the same as the Expiration Date. It is expected that the Settlement Date for the Tender Offers will be on or around Friday, September 18, 2026, the second business day after the Expiration Date, but which may change without notice (the "Settlement Date"). Payment for the Securities that are validly tendered and accepted for purchase pursuant to the Tender Offers will be made on the Settlement Date. YPF will not be responsible for any delays in the transmission of funds to Holders attributable to the clearing systems and under no circumstances will any interest be payable because of any such delay. Subject to the terms and conditions described in the Offer to Purchase, Holders who validly tender their Securities at or prior to the Expiration Date will receive the applicable Consideration specified in the table above payable for such tendered Securities that are accepted for purchase by YPF. In addition, YPF will pay accrued and unpaid interest on the Securities up to, but not including, the Settlement Date ("Accrued Interest") . Payment of the Consideration and Accrued Interest will be made on the Settlement Date. YPF reserves the absolute right to amend, extend, terminate or withdraw any or all of the Tender Offers in its sole discretion, subject to disclosure and as otherwise required by applicable law. Any (i) increase or decrease in the percentage of Securities sought in a Tender Offer, other than the acceptance for purchase of an additional amount of Securities not to exceed two percent of the applicable series of Securities, or (ii) change in the Consideration offered, will be communicated by public announcement that is widely disseminated no later than 9:00 a.m., New York City time (10:00 a.m. Buenos Aires time), on the third business day before the Expiration Date. Any other material change in the terms of a Tender Offer will be communicated by public announcement that is widely disseminated no later than 9:00 a.m., New York City time (10:00 a.m. Buenos Aires time), on the second business day before the Expiration Date. In the event of termination or withdrawal of a Tender Offer, Securities tendered and not accepted for purchase pursuant to such Tender Offer will be promptly returned to the tendering holders. The complete terms and conditions of the Tender Offers are described in the Offer to Purchase, copies of which may be obtained from Sodali & Co, the information and tender agent for the Tender Offers (the "Information and Tender Agent"), at the Tender Offer Website: https://projects.sodali.com/YPF, by email at YPF@investor.sodali.com, by telephone in Stamford at +1 203 658 9457, or in writing at 333 Ludlow Street, South Tower, 5th Floor, Stamford, CT 06902, United States . YPF has engaged BBVA Securities Inc., Itaú BBA USA Securities, Inc., J.P. Morgan Securities LLC and Santander US Capital Markets LLC to act as the dealer managers (the "Dealer Managers") and Banco Santander Argentina S.A., Banco de Galicia y Buenos Aires S.A., Balanz Capital Valores S.A.U., Cucchiara y Cía. S.A., Banco CMF S.A., Macro Securities S.A.U. and Latin Securities S.A.U. as local dealer managers (the "Local Dealer Managers") in connection with the Tender Offers. Questions regarding the terms of the Tender Offers may be directed to BBVA Securities Inc. by telephone at +1 (800) 422-8692 (U.S. toll free) or +1 (212) 728-2446 (collect), Itaú BBA USA Securities, Inc. by telephone at +1 (888) 770-4828 (U.S. toll free) or +1 (212) 710-6749 (collect), J.P. Morgan Securities LLC by telephone at +1 (866) 846-2874 (U.S. toll free) or +1 (212) 834-7279 (collect) and Santander US Capital Markets LLC by telephone at +1 (855) 404-3636 (U.S. toll free) or +1 (212) 940-1442 (collect).