UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer
Pursuant to Rule 27a-16 or 15d-16
under the Securities Exchange Act of 1934

For the month of September, 2026

Commission File Number: 001-38376

Central Puerto S.A.

(Exact name of registrant as specified in its charter)

Port Central S.A.

(Translation of registrant’s name into English)

Avenida Thomas Edison 2701

C1104BAB Buenos Aires

Republic of Argentina

+54 (11) 4317-5000

(Address of principal executive offices)

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

Form 20-F [X] Form 40-F [_]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Yes [_] No [X]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

Yes [_] No [X]

BUENOS AIRES, August 31, 2026

COMISIÓN NACIONAL DE VALORES (“CNV”)

25 de Mayo 175

Attn.: Management of Issuers

City of Buenos Aires

Present

A3 Mercados S.A.

Paraguay 777, 15th Floor

Rosario

BOLSAS Y MERCADOS ARGENTINOS S.A.

Sarmiento 299

City of Buenos Aires

Present

Ref.: Relevant Event

To whom it may concern,

I am pleased to address you in my capacity as Head of Market Relations of Central Puerto S.A. (the “Company”), in compliance with the provisions of Article 2, Section II, Chapter I, Title XII of the Rules of the National Securities Commission (N.T. 2013) (the “CNV Rules”), to inform you that the Board of Directors of the Company, based on the report issued by the Audit Committee and the Supervisory Committee, has resolved to establish the terms and conditions for the acquisition of the Company’s own shares for up to thirty million U.S. dollars (US$ 30,000,000), pursuant to Article 64 and subsequent articles of the Capital Markets Law No. 26,831, Article 220, subsection 2 of the General Companies Law, and the CNV Rules (the “Applicable Regulations”).

The Board of Directors considers that this transaction is in the best interest of the Company’s shareholders, who, through the share repurchase, will increase their participation in Central Puerto S.A.’s strategic assets.

Such procedure, which may be carried out by the Company and/or its subsidiaries, shall be subject to the following terms and conditions:

(i) Purpose of the acquisition: the share repurchase is intended to protect the value of the Company’s shareholders’ investment, considering that the market trading price of the shares does not adequately reflect the fair value of the Company’s underlying assets or the economic potential derived from their operation.

(ii) Maximum amount to be invested: thirty million U.S. dollars (US$ 30,000,000);

(iii) Percentage of share capital subject to the acquisition: the proposed acquisition shall be made with respect to fully paid-in shares and shall at no time exceed 10% of the Company’s share capital at the time of the acquisition, in accordance with the limits established by the Applicable Regulations;

(iv) Daily limit for market transactions: pursuant to the Applicable Regulations, up to 25% (twenty-five percent) of the average daily trading volume of the share on the markets on which it is listed, based on the preceding 90 (ninety) trading days;

(v) Price to be paid for the shares: the maximum price to be paid shall be US$ 16 per American Depositary Receipt (“ADR”) on the New York Stock Exchange (“NYSE”) and up to a maximum of AR$ 2,600 per common share on Bolsas y Mercados Argentinos;

(vi) Source of funds: the Repurchase shall be carried out with unrestricted reserves arising from optional reserves pending distribution resulting from the latest approved financial statements, evidencing the availability of cash to fund this resolution. It is hereby stated that the Company has sufficient liquidity to carry out the aforementioned acquisitions without affecting its solvency;

(vii) Term during which the acquisitions will be carried out: the Company shall acquire shares within a period of 180 calendar days, commencing on the business day following the date of publication of the purchase through the market communication media, subject to any renewal or extension of such period, which shall be disclosed to investors through the same means; and

(viii) Internal Communication: directors, members of the Supervisory Committee and managers are hereby informed that, while a decision by the Company to acquire its own shares is in effect, in accordance with subsection (vii) above, they may not sell shares of the Company owned by them or managed by them directly or indirectly during the applicable period.

Yours sincerely,

Leonardo Marinaro

Head of Market Relations

Central Puerto S.A.

SIGNATURES

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.