Transportadora de Gas del Sur S.A. (TGS)
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The business works in principle, but one material question is open. As long as it stays open, our findings do not carry a quality verdict.
Holding the stock is a bet that ENARGAS delivers its monthly tariff adjustments faster than inflation eats them, and that the multi-billion Vaca Muerta projects get funded without tipping the balance sheet. Buying in adds a valuation problem: market value in dollars, profit in pesos, and in between a currency that lost roughly 41 percent in 2025 — our data set carries a P/E of 15.74, translation at the closing rate gives about 18, and both are calculated cleanly. Three things belong in every report you read: are transported volumes still growing (last 74.2 million cubic meters per day)? How is the $3.0 billion project with YPF and Chevron being financed? And does a second distribution follow the first $1.15 per ADR, or does the profit stay in the reserve? Until those answers exist, watching wins. The decision is yours.
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Transportadora de Gas del Sur moves more than 60 percent of the natural gas Argentina consumes, through 5,746 miles of pipeline. The business is real, the volumes are rising, and the license was extended in July 2025 by twenty years to the end of 2047. The numbers are the complicated part: because Argentina counts as a hyperinflationary economy, every old peso figure is restated in every new annual report. Revenue for 2023 therefore appears in three consecutive filings with three entirely different values — Ps. 452.8 billion, then Ps. 986.1 billion, then Ps. 1,297.1 billion. Add books in pesos against financial debt that is 100 percent dollar-denominated, and a price set by a regulator rather than a market. London fund Helikon cut its position by 28.5 percent in the first quarter of 2026 — and in the same quarter sold out entirely of the co-owner of TGS's controlling shareholder. Not investment advice — just the question of how you value a company whose measuring stick is recalibrated every single year.
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This analysis is as of July 23, 2026. Stock Watch will tell you what's changed at TGS since then.
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Basics
Performance
Valuation
Profitability
Balance Sheet & Safety
Growth
Quality & Screener
AI Rating
Uses AIGeprüft am 24.07.2026 gegen die verfügbare SEC-Belegkette von Transportadora de Gas del Sur S.A. (Foreign Private Issuer, CIK 0000931427 — es gibt kein 10-K und kein 10-Q): Jahresbericht 20-F für 2025 (eingereicht 22.04.2026), Jahresbericht 20-F für 2024 (24.04.2025) sowie die 6-K vom 06.05.2026 (Quartalsmitteilung 1Q2026), 13.05.2026 (RIGI-Zulassung), 26.05.2026 (Zwischenabschluss zum 31.03.2026), 11.06.2026 (Verträge zum integrierten Flüssiggas-Projekt) und 12.06.2026 (Rating-Anpassung). Befund: Der Konzern verkauft keine KI-Produkte und nennt KI nirgends als Geschäftsrisiko für das eigene Modell — die Risk Factors drehen sich um Argentinien, Tarifregulierung, Währung und Inflation. Belegt ist dagegen der eigene, interne Einsatz: Im 20-F 2025 beschreibt TGS unter „Human Capital“, dass die Messung des Betriebsklimas 2025 auf die Plattform Slik umgestellt wurde, die dem Unternehmen neben Umfragen und Echtzeit-Dashboards ausdrücklich „artificial intelligence insights“ liefert; im selben Bericht führt die am 03.11.2025 vom Vorstand verabschiedete aktualisierte Cybersicherheits-Richtlinie eigene Definitionen und Verfahren für den sicheren Einsatz künstlicher Intelligenz ein. Beides ist operativer Einsatz beziehungsweise dessen Governance, keine Umsatzquelle. In den beiden Zwischenberichten und den Pflichtmitteilungen kommt KI nicht vor. Nach der Vorrang-Regel (verkauft > bedroht > nutzt > neutral) bleibt damit „nutzt“ — mit dem ehrlichen Zusatz, dass es sich um einen schmalen internen Anwendungsfall in Personal- und IT-Prozessen handelt, nicht um KI im Kernprozess des Gastransports.
View the full file — quotes, sources, reviewed filings
„During 2025, we renovated the measurement of organizational climate with the Slik platform, which provides us with customized surveys, real-time dashboards and artificial intelligence insights."
Im Jahr 2025 haben wir die Messung des Betriebsklimas auf die Plattform Slik umgestellt, die uns maßgeschneiderte Umfragen, Echtzeit-Dashboards und Erkenntnisse aus künstlicher Intelligenz liefert.
„Outlining of specific definitions and procedures related to the safe use of artificial intelligence."
Festlegung spezifischer Definitionen und Verfahren für den sicheren Einsatz künstlicher Intelligenz.
Filings Reviewed: 20-F 2026-04-22 · 20-F 2025-04-24 · 6-K 2026-05-06 · 6-K 2026-05-13 · 6-K 2026-05-26 · 6-K 2026-06-11 · 6-K 2026-06-12
Rated on July 24, 2026 · How the Rating Is Built
Quarterly Figures
| Quarter | EPS (Earnings Per Share) | EPS YoY (%) | Sales (ARS m) | Sales YoY (%) | Net Margin (%) | OCF (ARS m) | FCF (ARS m) |
|---|---|---|---|---|---|---|---|
| 2024: Q2 | 0.12 | -47.20 | 363,424 | 75.80 | 32.90 | 142,081 | 65,360 |
| 2024: Q3 | 0.35 | 288.90 | 331,968 | 48.50 | 20.70 | 171,457 | 90,965 |
| 2024: Q4 | 0.81 | 331.40 | 413,753 | 87.70 | 35.70 | 189,336 | 88,765 |
| 2025: Q1 | 0.68 | 51.60 | 320,991 | 8.60 | 33.40 | 142 | 90 |
| 2025: Q2 | 0.20 | 66.70 | 343,013 | -5.60 | 11.70 | 85 | 32 |
| 2025: Q3 | 0.51 | 45.70 | 421,417 | 26.90 | 26.60 | 164,033 | 70,420 |
| 2025: Q4 | 0.68 | -15.50 | 567,122 | 37.10 | 25.90 | 141,222 | 21,305 |
| 2026: Q1 | 0.77 | 14.00 | 484,200 | 50.80 | 33.00 | 195,773 | 52,384 |
- EPS (Earnings Per Share):
- Quarterly profit divided by the total share count — how much of the profit works out to a single share.
- YoY (Year over Year):
- Change versus the same quarter a year ago — this is how you compare without seasonal distortion (e.g. the holiday shopping season).
- Sales:
- All revenue for the quarter, before any costs are deducted — the top line of the income statement.
- Net Margin:
- What percentage of sales is left over as profit in the end. Negative means the company is posting a loss.
- OCF (Operating Cash Flow):
- The cash that actually flows into the till from the core business during the quarter — harder to dress up than book profit.
- FCF (Free Cash Flow):
- Operating cash flow minus capital expenditures — the money that's genuinely free to use, say for paying down debt, buybacks, or dividends.
Assessment: Opportunities & Risks
Volumes are growing where it counts: average daily deliveries in gas transportation rose from 66.8 million cubic meters (2023) to 74.2 (2025), and the firm-contracted share from 49.8 to 55.1, at 83 percent utilization. Liquids still delivered 1,076,729 tons in 2025 despite a seven-week shutdown — practically the prior-year level.
Hyperinflation accounting under IAS 29 makes peso series unusable across filings: consolidated revenue for 2023 appears as Ps. 452.8 billion, Ps. 986.1 billion and Ps. 1,297.1 billion in three consecutive annual reports. The purchasing power lost on the company's own cash is a real expense — Ps. 36.0 billion in the first quarter of 2026 alone, after Ps. 25.3 billion a year earlier.
The price of the core business is a political decision. In the five-year tariff review (Resolution 256/2025) ENARGAS set an allowed return of 7.18 percent real after tax against the 9.98 percent requested. How little of that arrives shows in the first quarter of 2026: segment revenue fell Ps. 7.1 billion despite tariff increases, because inflation restatement cost Ps. 48.5 billion.
As of December 31, 2025 the company holds Ps. 3,127.9 billion of equity (ratio 57.8 percent) plus cash and financial investments of Ps. 1,808.2 billion against financial debt of Ps. 1,705.6 billion — no net debt, with maturities not before 2031 and 2035. On June 11, 2026 S&P raised the rating from "B−" to "B". The catch: all debt is dollar-denominated while the books are in pesos.
Vaca Muerta supplies the demand: the tender in early 2026 drew requests for more than 32 million cubic meters per day, almost three times the capacity offered. Against that stand roughly $3.55 billion of announced projects — $550 million for the Perito Moreno expansion and $3.0 billion for the liquids project with YPF, Pluspetrol and Chevron — versus equity of roughly $2.15 billion. Funding is still open.
53.83 percent sits with CIESA, 25.33 percent with the state fund FGS, and only 20.84 percent with the broad public. The state stake is more than twice the size of all 18,052,759 ADRs outstanding; TGS itself names sales "such as the ANSES" as a price risk. The same state regulates the tariff. Helikon held roughly 13 percent of all ADRs as of March 31, 2026 — in a market that thin, a single seller moves the price.
Transportadora de Gas del Sur is money illusion in its purest form: a real, growing business — more gas than ever, a license extended to 2047, a balance sheet with almost no net debt, a first dividend in years — expressed in numbers that multiply from report to report without anything having moved. Revenue for 2023 sits in the books three times: Ps. 452.8 billion, Ps. 986.1 billion and Ps. 1,297.1 billion. Add debt that is 100 percent dollar-denominated against a peso balance sheet, a tariff set by a regulator, and a $3.55 billion growth program against $2.15 billion of equity. Whoever invests here buys a solid network and an open bill. Not investment advice.
- Transportadora de Gas del Sur reached our research list through the Form 13F-HR of London-based Helikon Investments Ltd for the quarter ended March 31, 2026 (filed May 8, 2026): 2,347,333 ADRs worth $81,241,195. The position was built in the third quarter of 2025, added to in the fourth and cut by 28.5 percent in the first quarter of 2026; in that same quarter the fund sold out entirely of Pampa Energía ($50.0 million) — the co-owner of TGS controlling shareholder CIESA. A 13F shows only U.S.-listed long positions, arrives with a 35- to 45-day delay and contains no short sales or derivatives — a rear-view mirror, not a road map.
- Transportadora de Gas del Sur is a foreign private issuer: there is no 10-K and no 10-Q. The evidence chain for this analysis is the annual reports on Form 20-F for 2025 (filed 04.22.2026) and 2024 (04.24.2025) plus the interim reports and mandatory disclosures on Form 6-K (earnings release 05.06.2026, interim financial statements 05.26.2026, RIGI approval 05.13.2026, NGL project 06.11.2026, credit rating 06.12.2026).
- Our in-house stock scanner carries eight quarters for TGS in the reporting currency peso: Piotroski F-Score 7 of 9, equity ratio 0.578, P/E 15.74 (data as of July 23, 2026). The Altman Z-Score, NCAV and the cash line are deliberately not carried, because those metrics would mix peso balance sheet items with dollar market values. Every peso amount in this analysis is stated in constant purchasing power under IAS 29 and is not comparable across annual reports; analyses are evergreen, daily prices are not a buy argument.
About the Company
Transportadora de Gas del Sur S.A. engages in transportation of natural gas, and production and commercialization of natural gas liquids in Argentina and internationally. The company operates through four segments: Natural Gas Transportation Services; Liquids Production and Commercialization; Midstream; and Telecommunications. The Natural Gas Transportation segment transports natural gas through pipeline system to distribution companies, power plants, and industrial customers. It provides operation and maintenance services for the natural gas transportation facilities. The Liquids Production and Commercialization segment produces and commercializes natural gas liquids, such as ethane, liquid petroleum gas, natural gasoline, propane, and butane. This segment offers certain related services comprising reception, storage, and dispatch of the liquids. The Midstream segment provides natural gas conditioning services; treatment, removal of impurities and natural gas compression, including the collection and transport of natural gas; and inspection and maintenance of pipelines and compressor plants services. In addition, this segment offers steam generation for electricity production and management services for expansion works and steam generation for the production of electricity. The Telecommunications segment offers data transmission services through a network of digital terrestrial radio relay. It serves residential, commercial, industrial, and electric power generation end users. The company was incorporated in 1992 and is headquartered in Buenos Aires, Argentina. Transportadora de Gas del Sur S.A. operates as a subsidiary of Compañía de Inversiones de Energía S.A.
| IPO Year | 1994 |
|---|
Chart
Interactive price chart (TradingView).
Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.