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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

_____________

FORM 6-K

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities and Exchange Act of 1934

For October 6, 2026

Commission file number: 1-13.396

Transportadora de Gas del Sur S.A.

Cecilia Grierson 355, Twenty sixth Floor

(1107), Capital Federal

Argentina

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 X Form 40-F

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

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

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to the Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes No X

If \"Yes\" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):

City of Buenos Aires, October 6, 2026.

E-NOTA-20261006-63731

Messrs.

Comisión Nacional de Valores (Argentine Securities and Exchange Commission)

Bolsas y Mercados Argentinos S.A. (Argentine Stock Exchanges and Markets)

Bolsa de Comercio de Buenos Aires (Buenos Aires Stock Exchange)

Gerencia Técnica y de Valores Negociables (Technical and Negotiable Securities Management)

A3 Mercados S.A. (A3 Markets)

Re: Material Fact. Resignation of Alternate Director

Dear Sirs,

I am writing to you in my capacity as Head of Market Relations of Transportadora de Gas del Sur S.A. (“tgs” or the “Company”), to inform you that, on this date, Ms. Flavia Vanesa Bevilacqua, who was appointed Alternate Director by tgs’ Annual Ordinary, Extraordinary and Special Shareholders’ Meeting held on April 15, 2026, notified the Company, by means of a letter dated October 6, 2026, of her resignation from such position due to personal reasons, effective as of such date.

In this regard, we hereby inform you that the above-mentioned resignation will be considered by tgs’ Board of Directors in its next meeting.

Yours sincerely.

Hernán Diego Flores Gómez

Head of Market Relations

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.

Transportadora de Gas del Sur S.A.

\n\n\n

By: \n	/s/Alejandro M. Basso \n
Name: \n	Alejandro M. Basso \n
Title: \n	Chief Financial Officer and Services Vice President \n

\n\n\n

By: \n	/s/Hernán D. Flores Gómez \n
Name: \n	Hernán Diego Flores Gómez \n
Title: \n	Legal Affairs Vice President \n

Date: October 6, 2026.

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