S&P upgrades Transportadora de Gas del Sur (TGS) long-term debt to B from B-

Rhea-AI Filing Summary

Transportadora de Gas del Sur S.A. reports that S&P Global Ratings upgraded its long-term local and foreign currency debt ratings from “B-” to “B” on June 11, 2026. The upgrade follows S&P’s revision of Argentina’s transfer and convertibility risk assessment, which influences perceived sovereign and corporate credit risk.

Positive

• S&P Global Ratings upgrade: Long-term local and foreign currency debt ratings raised from “B-” to “B”, signaling an improved risk assessment and potentially better future financing terms.

Negative

• None.

Insights

Credit & Fixed-Income Analyst

S&P raised TGS’s long-term debt rating from B- to B.

Transportadora de Gas del Sur S.A. received an S&P upgrade on its long-term local and foreign currency debt, moving from B- to B. This reflects improved views on Argentina’s transfer and convertibility risk, which frames how easily issuers can service foreign-currency obligations.

A one-notch move within the B category still indicates speculative-grade risk, but it can modestly improve funding access and pricing for future borrowing. The action is driven by country-risk reassessment rather than company-specific financial changes in this excerpt, yet it is directionally favorable for creditors and, indirectly, equity holders.

Key Figures

Previous S&P long-term rating: B- New S&P long-term rating: B Rating action date: June 11, 2026 +1 more

4 metrics

Previous S&P long-term rating B- Long-term local and foreign currency debt rating before upgrade

New S&P long-term rating B Long-term local and foreign currency debt rating after upgrade

Rating action date June 11, 2026 Date S&P resolved to upgrade ratings

Disclosure date June 12, 2026 Date of material fact communication in Buenos Aires

Key Terms

Material Fact, long-term local and foreign currency debt ratings, transfer and convertibility risk assessment, Report of Foreign Issuer

4 terms

Material Fact regulatory

"Re: Material Fact. Amendment to the Company’s Credit Rating"

long-term local and foreign currency debt ratings financial

"upgrade the Company’s long-term local and foreign currency debt ratings from “B-” to “B”"

transfer and convertibility risk assessment financial

"following a revision of Argentina’s transfer and convertibility risk assessment"

Report of Foreign Issuer regulatory

"FORM 6-K Report of Foreign Issuer Pursuant to Rule 13a-16"

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FAQ

What credit rating change did S&P make for Transportadora de Gas del Sur (TGS)?

S&P Global Ratings upgraded Transportadora de Gas del Sur’s long-term local and foreign currency debt ratings from “B-” to “B”. This one-notch move within speculative grade reflects a better risk view tied to Argentina’s transfer and convertibility assessment.

When was Transportadora de Gas del Sur’s S&P rating upgraded?

S&P Global Ratings resolved to upgrade Transportadora de Gas del Sur’s long-term ratings on June 11, 2026. The company reported this as a material fact dated June 12, 2026, in a filing addressed to Argentine market authorities.

Why did S&P upgrade TGS’s long-term debt ratings to B?

S&P upgraded TGS’s long-term local and foreign currency debt ratings following a revision of Argentina’s transfer and convertibility risk assessment. This change indicates an improved view of the broader country risk conditions affecting issuers like TGS.

Does the S&P rating upgrade apply to both local and foreign currency debt of TGS?

Yes, the S&P Global Ratings action upgraded Transportadora de Gas del Sur’s long-term local and foreign currency debt ratings from “B-” to “B”. The filing explicitly states that both local and foreign currency long-term ratings were raised together.

How did Transportadora de Gas del Sur disclose the S&P rating upgrade?

Transportadora de Gas del Sur disclosed the S&P rating upgrade as a material fact in a communication dated June 12, 2026. The notice was sent by the Head of Market Relations to Argentine securities and exchange authorities and furnished on Form 6-K.

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 June 12, 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, June 12, 2026.

E-NOTA-20260612-62681

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. Amendment to the Company’s Credit Rating

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”), in order to inform that, on June 11, 2026, S&P Global Ratings (“S&P”) resolved to upgrade the Company’s long-term local and foreign currency debt ratings from “B-” to “B”, following a revision of Argentina’s transfer and convertibility risk assessment.

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.

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

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

Date: June 12, 2026.