TGS files 2025 annual report on Form 20-F

Transportadora de Gas del Sur S.A.

Rhea-AI Filing Summary

Transportadora de Gas del Sur S.A. (tgs) filed its annual report on Form 20-F for the fiscal year ended December 31, 2025 with the U.S. Securities and Exchange Commission. The report is available on the company’s website and on the SEC’s website, and shareholders can request free hard copies from the Investor Relations office.

The company describes itself as Argentina’s leading natural gas transporter, moving approximately 60% of the gas consumed in the country through more than 5,700 miles of pipelines, with firm contracted capacity of 89.4 MMn3/d. It is also a major natural gas processor and is investing in infrastructure in the Vaca Muerta basin to expand midstream services. The controlling shareholder, Compañía de Inversiones de Energía S.A., holds 53.83% of tgs’s total share capital.

Key Figures

Market share of gas transported: Approximately 60% of gas consumed in Argentina Pipeline network length: More than 5,700 miles Firm contracted capacity: 89.4 MMn3/d +2 more

5 metrics

Market share of gas transported Approximately 60% of gas consumed in Argentina Company description in 2025 Form 20-F announcement

Pipeline network length More than 5,700 miles Gas transportation system in Argentina

Firm contracted capacity 89.4 MMn3/d Natural gas transportation capacity

Controlling stake held by CIESA 53.83% of total share capital Ownership structure of TGS

CIESA share split 50% Pampa Energía, 50% GIP/PCT Shareholders of controlling company CIESA

Key Terms

Form 20-F, Form 6-K, firm contracted capacity, Vaca Muerta basin, +1 more

5 terms

Form 20-F regulatory

"filed its annual report on Form 20-F for the fiscal year ended"

Form 20-F is the standardized annual disclosure that non-U.S. companies must file with the U.S. securities regulator when their shares are traded in the U.S.; it contains audited financial statements, a plain-language description of the business, management discussion, governance details and key risk factors. It matters to investors because it provides a consistent, comparable company “report card” and rulebook, helping buyers assess financial health, governance and risks before investing.

Form 6-K regulatory

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

A Form 6-K is a report that companies listed in certain countries file to provide important updates, such as financial results, corporate changes, or other significant information, to regulators and investors. It functions like an official company update or news release, helping investors stay informed about developments that could affect their investment decisions.

firm contracted capacity financial

"with a firm contracted capacity of 89.4 MMn3/d"

Vaca Muerta basin financial

"infrastructure investments in Vaca Muerta basin will allow to grow"

Midstreamers financial

"positioning tgs as one of the main Midstreamers in Argentina"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Transportadora de Gas del Sur (TGS) file with the SEC?

Transportadora de Gas del Sur filed its 2025 Annual Report on Form 20-F for the fiscal year ended December 31, 2025. This comprehensive report provides the company’s audited financial statements and detailed business information for investors and regulators.

How can investors access TGS’s 2025 Form 20-F?

Investors can access TGS’s 2025 Form 20-F on the company’s website at www.tgs.com.ar and on the SEC’s website at www.sec.gov. Shareholders may also request a free hard copy of the complete financial statements from the Investor Relations office.

What is TGS’s role in Argentina’s natural gas market?

TGS is described as Argentina’s leading natural gas transporter, moving approximately 60% of the gas consumed in the country. It operates more than 5,700 miles of gas pipelines with firm contracted capacity of 89.4 MMn3/d, and is also a major natural gas processor.

What infrastructure investments is TGS making in the Vaca Muerta basin?

TGS highlights infrastructure investments in the Vaca Muerta basin aimed at significantly growing services to natural gas producers. These projects are expected to strengthen its position as one of Argentina’s main midstream service providers, supporting development of this important shale gas region.

Who controls Transportadora de Gas del Sur (TGS)?

Compañía de Inversiones de Energía S.A. (CIESA) is the controlling company of TGS, owning 53.83% of its total share capital. CIESA’s shareholders are Pampa Energía S.A. with 50%, and Grupo Inversor Petroquímica S.L. together with PCT L.L.C. holding the remaining 50%.

On which stock exchanges are TGS shares traded?

TGS shares trade on the New York Stock Exchange under the symbol TGS and on BYMA (Bolsas y Mercados Argentinos S.A.) under the symbol TGSU2. This dual listing provides both international and Argentine investors access to the company’s equity.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/22/2026 - 05:50 PM EDT Learn about SEC filing dates

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 April 22, 2026

Commission file number: 1-13.396

Transportadora de Gas del Sur S.A.

Cecilia Grierson 355, piso 26

(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, April 22, 2026.

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)

TGS Files 2025 Annual Report on Form 20-F

Buenos Aires, Argentina, April 22, 2026.  Transportadora de Gas del Sur S.A. (“tgs” or “the Company”) (NYSE: TGS, MERVAL: TGSU2) announced that today it filed its annual report on Form 20-F for the fiscal year ended December 31, 2025 (the “2025 Annual Report”) with the U.S. Securities and Exchange Commission (the “SEC”). The 2025 Annual Report can be accessed by visiting the Company’s website at www.tgs.com.ar as well as on the SEC’s website at www.sec.gov. In addition, shareholders may receive a hard copy of the Company’s complete financial statements free of charge by requesting a copy from Carlos Almagro (calmagro@tgs.com.ar) or Leandro Perez Castaño (leandro_perez@tgs.com.ar) in TGS’s Investor Relations Office at +(54-11) 3751-5100.

tgs is the leader in Argentina in the transportation of natural gas, transporting approximately 60% of the gas consumed in the country, through more than 5,700 miles of gas pipelines, with a firm contracted capacity of 89.4 MMn3/d. It is one of the main natural gas processors. In addition, tgs´ infrastructure investments in Vaca Muerta basin will allow to grow significantly in the provision of services to natural gas producers, positioning tgs as one of the main Midstreamers in Argentina. tgs shares are traded on NYSE (New York Stock Exchange) and BYMA (Bolsas y Mercados Argentinos S.A.). The controlling company of tgs is Compañía de Inversiones de Energía S.A. ("CIESA"), which owns 53.83% of the total share capital. CIESA’s shareholders are: (i) Pampa Energía S.A. with 50%, (ii) Grupo Investor Petroquímica S.L. (member of the GIP group, led by the Sielecki family) and PCT L.L.C. with the remaining 50%.

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: April 22, 2026.