FORM 6 - K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Private Issuer

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

the Securities Exchange Act of 1934

As of August 5, 2026

TENARIS, S.A.

(Translation of Registrant's name into English)

26, Boulevard Royal, 4th floor

L-2449 Luxembourg

(Address of principal executive offices)

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

Form 20-F  ✓    Form 40-F      

The attached material is being furnished to the Securities and Exchange Commission pursuant to Rule 13a-16 and Form 6-K under the Securities Exchange Act of 1934, as amended. This report contains Tenaris S.A. Half-year report 2026 – Interim management report.

SIGNATURE

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.

Date: August 5, 2026

Tenaris, S.A.

By: /s/ Giovanni Sardagna

Giovanni Sardagna

Investor Relations Officer

Half-year report 2026 - Interim management report

TABLE OF CONTENTS

Half-year report 2026 - Interim management report

INTERIM MANAGEMENT REPORT

Company Overview

Tenaris is a leading global manufacturer and supplier of steel pipe products and related services for the world’s energy industry and other industrial applications. Our customers include most of the world’s leading oil & gas companies, and we operate an integrated network of steel pipe manufacturing, research, finishing and service facilities with industrial operations in the Americas, Europe, the Middle East, Asia and Africa.

Although our operations are mainly focused on serving the oil & gas industry, we also supply pipes and tubular components for non-energy applications. We develop and supply products and services for low-carbon energy applications such as geothermal wells, waste-to-energy (bioenergy) power plants, hydrogen storage and transportation, and carbon capture and storage ("CCS").

Through an integrated global network of R&D, manufacturing and service facilities, and a team of around 26,000 people worldwide, we work with our customers to meet their needs in a timely manner, observing the highest levels of product performance and reliability.

For more information on the Company, including its business strategy, competitive strengths, business segments, products, processes and facilities, main competitors, raw materials and energy, main investments and capital expenditure program, see our annual report for the year ended December 31, 2025. For a discussion and analysis of our financial condition and results of operations see “Business overview - Operating and Financial Review and Prospects” in this half-year report.

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Principal Risks and Uncertainties

We face certain risks, including risks associated with our business and the industry in which we operate. We are a global steel pipe manufacturer primarily focused on manufacturing products and related services for the oil and gas industry.

Demand for steel pipe products for the oil and gas industry has been historically volatile and depends primarily on the number of wells drilled, completed and reworked, and on well depth, length and drilling conditions. Exploration, development and production activity and the related capital spending by oil and gas companies, including national oil companies, depend primarily on current and expected oil and gas prices and are sensitive to expectations for economic growth and resulting oil and gas demand. Several factors, such as the supply and demand for oil and gas, the consolidation in the oil and gas industry, the development and availability of new drilling technology, as well as political and global economic conditions, and government regulations affect these prices. When oil and gas prices fall, producers generally reduce production and exploration spending and purchase fewer steel pipe products, which may impact our results of operations.

Adverse economic, political and security conditions in the countries where we operate or sell our products and services, as well as armed conflicts, geopolitical tensions and related sanctions, may disrupt our operations, reduce demand and adversely affect our revenues, profitability and financial condition. We have significant operations and sales in multiple countries, and our business is exposed to political, economic, social, regulatory and security developments that are unpredictable and may vary significantly from jurisdiction to jurisdiction. These developments and risks include trade restrictions, inflation, devaluation, exchange controls, changes (including retroactive) in tax regimes, price controls, delays or denials of governmental approvals, labor disruptions, energy shortages, civil unrest, criminal violence, armed conflicts, sanctions and other geopolitical events. The occurrence of any of these events could disrupt our manufacturing operations or supply chain, reduce demand for our products and services, and adversely affect our financial condition and results of operations.

In addition, armed conflicts and geopolitical tensions, particularly in the Middle East, and related sanctions, may disrupt global trade flows and sales to affected customers, increase energy and raw-material costs, affect supply availability, restrict transactions with certain counterparties, result in operational disruptions or asset impairments, and affect our delivery commitments, adversely affecting our results of operations and financial condition. In March 2026, the armed conflict involving the United States and Israel against Iran, and retaliatory actions by Iran across the broader Middle East, led to a closure of the Hormuz Strait, through which almost 20% of the world’s oil and LNG supply is shipped, resulting in extreme volatility of energy prices and a disruption to oil and LNG production and transportation in the region. There is uncertainty about the full impact and consequences resulting from the conflict. We maintain significant industrial operations and customer relationships in the Middle East. A prolonged conflict or an escalation of hostilities in the region could disrupt our operations at these facilities, impair our ability to fulfill customer orders, increase the cost of transportation both through alternative ports or by land and/or additional insurance costs), result in potential order cancellations, restrict employee mobility, damage physical infrastructure, and hinder supply of raw materials, semi-finished steel and other inputs to our regional mills. The Iran conflict adds to existing supply chain challenges, including trade restrictions from tariffs and supply chain disruptions that have continued since the Russia–Ukraine war. A sustained disruption to the Hormuz Strait could significantly increase oil prices and fuel broader inflation, slow global economic activity and reduce demand for our products. The imposition of additional sanctions targeting Iran-linked maritime networks and the potential for expanded trade restrictions may further constrain our sourcing alternatives and increase compliance costs.

Regulatory, investor, customer and social scrutiny of GHG emissions and climate-related impacts has increased globally. Governments and regulators in multiple jurisdictions have adopted, or are considering adopting, laws, regulations and policies aimed at reducing emissions, promoting the transition to a lower-carbon economy and expanding climate and sustainability-related disclosures. Government initiatives include carbon taxes or carbon-pricing systems (including the CBAM), “cap-and-trade” systems (like the ETS) and measures promoting renewable energy sources, or electric vehicles. These regulations are complex, evolving and, in some cases, inconsistent or conflicting across jurisdictions, increasing compliance burdens, costs and legal risks. Climate-related regulatory uncertainty, including changes to disclosure regimes and emissions-related requirements, may further increase compliance complexity and costs. In addition, governments may adopt more stringent or abrupt policy, legal, technological or market measures to meet climate objectives. We provide products and services to the oil and gas industry, which accounts for a significant portion of global GHG emissions. Existing and future climate-related legislation, carbon pricing mechanisms, emissions-reporting obligations, restrictions on fossil fuel development, government incentives for alternative energy sources and increasing competitiveness of renewable energy may reduce demand for oil and natural gas and, in turn, for our products and services. These developments may increase operating and compliance costs, require additional capital expenditures and adversely affect our market position. Shifts in stakeholder expectations regarding climate-related performance and disclosures, and our ability to meet evolving regulatory, investor, customer and employee demands, may adversely affect our reputation, access to capital and results of operations.

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Our business has been, and in the future could be, affected by severe weather in areas where we operate, which could materially affect our operations and financial results. Extreme weather conditions and natural disasters such as hurricanes, extreme wind, fires, flooding or coastal storm surges have resulted, and may in the future result, in the shutdown of our facilities, evacuation of our employees, and activity disruptions at our clients’ well-sites or in our supply chain. Chronic physical risks associated with climate change, including changes in precipitation patterns and increases in average temperatures and sea levels, may increase operating costs and capital expenditures resulting from facility damage, supply constraints, higher insurance costs or reduced availability of insurance, reduced production capacity, and asset impairments or early retirement. Occurrence of these risks could adversely affect our financial condition, results of operations and cash flows.

We are subject to extensive and evolving environmental, health and safety laws and regulations in the jurisdictions in which we operate, including those relating to hazardous materials, air emissions, water discharges, and waste management. Environmental requirements have become increasingly complex, stringent, and costly to implement, vary significantly across jurisdictions, and may place us at a competitive disadvantage relative to competitors operating in jurisdictions with less stringent standards. Compliance costs and the impact of future regulatory changes are often uncertain and may require significant capital expenditure or remediation costs. Certain environmental laws impose strict, joint and several liabilities for environmental damage, remediation, and threats to public health, regardless of fault or compliance at the time of the activity. As a result, we may be exposed to liabilities arising from environmental incidents, conditions, or activities caused by third parties or from historical operations. Environmental incidents or accidents, even if promptly addressed, could result in regulatory actions, remediation obligations, reputational harm and operational disruptions. In addition, trade-related environmental measures, such as carbon pricing and border adjustment mechanisms, including the CBAM, may increase compliance costs, administrative burdens and the cost of accessing certain markets. Our oil and gas casing, tubing, and line pipe products are sold primarily for use in oil and gas drilling, gathering, transportation, processing and power generation facilities, which are subject to inherent risk. Product defects or failures, including well failures, line pipe leaks, blowouts, bursts and fires, could result in personal injury, property damage, environmental pollution, production losses and related liabilities, adversely affecting our results of operations and financial condition.

Competition in the global market for steel pipe products may cause us to lose market share and hurt our sales and profitability.

The global market for steel pipe products is highly competitive; key factors include price, quality, service and technology. Due to the global nature of our operations, we export and import products from several countries and, in many jurisdictions, supplement domestic production with imported products, including OCTG and other products imported into the United States from our facilities in other countries.

From time to time, governmental authorities or local producers in countries where we operate or sell our products initiate or request trade remedy proceedings, including antidumping, countervailing duty or safeguard investigations, or seek other import restrictions. These proceedings, and any resulting duties, deposits, penalties, quotas or other measures, may increase our costs, restrict our access to important markets, limit our growth opportunities or affect the competitiveness of our products. We can give no assurance as to the imposition, continuation, level or effectiveness of any such measures, or as to the outcome of any investigation, review or appeal.

For example, in 2026 a Tenaris subsidiary was subject to an antidumping proceeding in Canada concerning imports of OCTG, which resulted in the application of antidumping duties to certain OCTG imports into Canada. Although the application of those duties is not expected to have a material effect on the Company or its subsidiaries, similar proceedings in Canada or other jurisdictions could adversely affect our business depending on their scope, duration and outcome.

In addition, several jurisdictions of significance to our business have imposed or expanded local content requirements or other regulations limiting imports. If these restrictions are imposed, expanded or maintained, our competitive position could be negatively affected, which could in turn adversely affect our revenues, profitability and financial condition. For further information on U.S. antidumping duty proceedings, see note 18 “Contingencies, commitments and restrictions on the distribution of profits” to our unaudited Consolidated Condensed Interim Financial Statements.

Our sales may also be affected as a result of tariffs and other international trade regulations. We are subject to tariffs and trade and customs laws and regulations governing shipment of goods and services across international borders. In addition, the EU, the United States and other countries impose requirements, recordkeeping and reporting obligations and, in certain cases, economic sanctions, to control, restrict or prohibit the import and export of certain goods and services. Certain governments have also imposed economic sanctions against certain countries, persons or other entities, such as sanctions that restrict or prohibit international commercial transactions involving Iran, Russia, Syria and Venezuela, and their citizens or companies. Similarly, we are subject to the U.S. anti-boycott laws. International trade laws and regulations are complex and frequently changing, and they may be enacted, amended, enforced or interpreted in a manner that could materially impact our operations. For more information on U.S. tariffs on steel imports, please see note 19 “Tariffs on steel and other imports” to our unaudited consolidated financial statements included in this half-year report.

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Profitability may also be hurt if increases in the cost of raw materials, energy and other costs and limitations or disruptions to the supply of raw materials and energy, result in higher costs of production that cannot be offset by higher selling prices or if the limited availability of such resources forces us to curtail production. Disruptions to our manufacturing processes could adversely impact our operations, affect customer service levels or our reputation, or expose us to liability and, consequently, adversely affect our financial results. Low levels of capacity utilization or failure to attract or retain a qualified workforce could also affect our results of operations and financial conditions. In addition, the increasing adoption of artificial intelligence and automation technologies in our operations may require significant reskilling and redeployment of our workforce, heighten competition for AI-skilled talent, and give rise to labor relations challenges, including resistance to changes in job content and increased scrutiny in collective bargaining, any of which could adversely affect our productivity, costs and employee relations. Certain consequences of climate change may further complicate our workforce management and planning, adversely affecting our ability to attract and retain qualified personnel.

We plan to continue implementing our business strategy of consolidating our position as a leading global supplier of integrated product and service solutions to the energy and other industries and adapting to the energy transition by reducing the carbon emissions in our operations and developing and supplying products and services for low-carbon energy applications, while pursuing strategic investment opportunities. Any component of this strategy could cost more than anticipated (including due to increasing regulatory requirements aimed at transitioning to a lower-carbon economy), may not be successfully implemented or could be delayed or abandoned. Assessments of potential acquisitions, joint ventures, partnerships and capital investments necessarily rely on assumptions regarding timing, profitability, market conditions and customer behavior that may prove incorrect. Our past or future acquisitions, significant investments and alliances may not perform in line with expectations and could adversely affect our operations and profitability. Integration of acquired businesses can place new demands on our organization and personnel, disrupt ongoing activities and divert management attention. Moreover, we may acquire assets unrelated to our core business and may be unable to integrate them effectively or divest them on favorable terms. These transactions are also subject to scrutiny by governmental authorities, including antitrust and consumer protection authorities. The costs of complying with authorization or investigation procedures may be significant. Even if we successfully implement our business strategy, it may not yield the expected results, or decisions by our joint venture partners may frustrate our initiatives. External factors -such as market volatility, shifts in customer capital spending, supply chain disruptions and the uncertain pace of the energy transition- could undermine anticipated benefits. Increased costs to decarbonize operations and develop new products, misallocated capital, or failure to realize anticipated synergies could harm our growth, competitive position, and profitability.

Our results of operations and financial condition could be adversely affected by movements in exchange rates. In addition, particularly as a consequence of deteriorating market conditions, we may be required to record a significant charge to earnings if we must reassess our goodwill or other assets as a result of changes in assumptions underlying the carrying value of certain assets. As a global company, our business is carried out in currencies other than the U.S. dollar, which is the Company’s functional and presentation currency. As a result, we are exposed to foreign exchange rate risk. Changes in currency values and foreign exchange regulations could adversely affect our financial condition and results of operations. For more information on foreign exchange rate risk and restrictions, and in particular for the current situation in Argentina, see note 20 “Foreign exchange control measures in Argentina” to our unaudited consolidated condensed interim financial statements included in this half-year report. In addition, a significant portion of our assets are subject to amortization. These assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Intangible assets with indefinite useful life, including goodwill, are subject to impairment tests.

We are subject to tax laws and regulations in multiple jurisdictions, and the integrated nature of our global operations may give rise to conflicting claims by tax authorities, including with respect to transfer pricing and the allocation of taxable profits among jurisdictions. Although many jurisdictions provide dispute resolution mechanisms under double taxation treaties, such processes may be lengthy, uncertain and may not fully eliminate double taxation. Tax authorities worldwide have increased scrutiny of multinational groups, and ongoing changes to international tax frameworks, including initiatives led by the OECD, the European Union and other jurisdictions, have increased complexity, compliance obligations and the risk of tax disputes. We are subject to global minimum taxation regimes, including Pillar Two rules, which may result in additional tax liabilities, increased compliance costs and greater exposure to interpretation differences among tax authorities. The implementation, coordination and interaction of these regimes across jurisdictions remain evolving and uncertain. Further changes in tax laws, regulations or their interpretation or enforcement, including those related to evolving international tax initiatives, could require adjustments to our organizational structure, increase the risk of audits and disputes, and result in additional taxes, penalties or interest. Any of these developments could adversely affect our profitability, financial condition and cash flows.

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We operate globally, including in jurisdictions with elevated corruption risks. Despite our commitment to conduct business ethically and in compliance with applicable anti-corruption laws, including the FCPA, the UK Bribery Act, and similar laws in other jurisdictions, we face the risk that our employees, agents, representatives, affiliates or other associated persons may engage in conduct that violates such laws. Many anti-corruption regimes impose strict liability on companies for the actions of third parties acting on their behalf, and we cannot assure that all past or future violations, including at acquired businesses, will be detected or prevented. Actual or alleged violations of anti-corruption laws could result in governmental investigations, significant management distraction, substantial fines, penalties or other sanctions, private litigation, increased compliance costs, and reputational damage, which could adversely affect our operations, revenues, profitability and financial condition.

In addition, limitations on our ability to protect our intellectual property rights, including our trade secrets, could adversely affect our competitive advantage and financial results.

Cyberattacks could have a material adverse impact on our business and results of operations. We rely heavily on information systems, and cyber threats are persistent, evolving, and often beyond our control. Despite significant investments in security, monitoring, and response, we experience cyber incidents in the normal course of business. The growing availability and use of artificial intelligence amplify adversarial capabilities and increases the likelihood, scale, and sophistication of attacks. There can be no assurance that our defenses will prevent or limit the effects of cyber incidents. We remain vulnerable to unauthorized access, loss, destruction, corruption, or misuse of data; compromise of credentials and identities; system and network outages; programming or employee errors; and dishonest or malicious behavior. Threats may also arise from third parties and the broader ecosystem, including suppliers, service providers, and customers, where we do not control the effectiveness of their safeguards. Supply chain complexity heightens the risk of propagation across Tenaris’s environment. If critical third parties are affected, or if our own safeguards are circumvented or breached, consequences could include disruption of operations and manufacturing, loss of access to critical systems and financial reporting, compromise of intellectual property and customer data, failure to meet customer requirements, reputational damage, regulatory investigations, fines and penalties (including for personal data protection and breach notification), safety and environmental impacts, and other financial losses. The dynamic threat landscape may also require continued increases in resources to enhance prevention, detection, response, and recovery capabilities. We do not currently maintain standalone cyber insurance, and existing property and general liability policies may not adequately cover cyber-related losses. Investigations and remediation following an incident can be prolonged, during which the full scope of harm may be unknown and certain issues may recur. Additionally, failure to timely monitor and address technology obsolescence could increase costs and operational risk. Regulatory developments, including restrictions on ransomware payments and related facilitation, may limit our options for responding to certain attacks.

As a holding company, our subsidiaries’ ability to pay cash dividends and make other payments to us depends on the results of operations and financial condition of such subsidiaries, which could be restricted by legal, contractual or other limitations, including exchange controls or transfer restrictions, and other agreements and commitments of our subsidiaries.

The Company is a holding company and conducts all its operations through subsidiaries. The ability of our subsidiaries to pay dividends and make other payments to us will depend on their results of operations and financial condition. The Company’s ability to pay dividends to shareholders is subject to legal and other requirements and restrictions in effect at the holding company level. As of June 30, 2026, San Faustin beneficially owned 68.34% of the Company’s issued share capital, and 68.34% of the voting rights. As a result, RP STAK is indirectly able to elect a substantial majority of the members of the Company’s board of directors and has the power to determine the outcome of most actions requiring shareholder approval, including, subject to the requirements of Luxembourg law, the payment of dividends. The decisions of the Company’s controlling shareholder may not reflect the will or best interests of other shareholders.

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Outstanding Legal Proceedings

Tenaris is from time to time subject to various claims, lawsuits and other legal proceedings, including customer, employee, tax and environmental-related claims, in which third parties are seeking payment for alleged damages, reimbursement for losses, or indemnity. Management, with the assistance of legal counsel, periodically reviews the status of each significant matter and assesses potential financial exposure.

Some of these claims, lawsuits and other legal proceedings involve highly complex issues, and often these issues are subject to substantial uncertainties and, therefore, the probability of loss and an estimation of damages are difficult to ascertain. Accordingly, with respect to a large portion of such claims, lawsuits and other legal proceedings, the Company is unable to make a reliable estimate of the expected financial effect that will result from ultimate resolution of the proceeding. In those situations, the Company has not accrued a provision for the potential outcome of these cases.

If a potential loss from a claim, lawsuit or other proceeding is considered probable and the amount can be reasonably estimated, a provision is recorded. Accruals for loss contingencies reflect a reasonable estimate of the losses to be incurred based on information available to management as of the date of preparation of the financial statements and take into consideration litigation and settlement strategies. In a limited number of ongoing cases, the Company was able to make a reliable estimate of the expected loss or range of probable loss and, depending on the likelihood of occurrence, in some of such cases has accrued a provision for such loss but believes that publication of this information on a case-by-case basis would seriously prejudice the Tenaris’s position in the ongoing legal proceedings or in any related settlement discussions. Accordingly, in these cases, the Company has disclosed information with respect to the nature of the contingency but has not disclosed its estimate of the range of potential loss.

The Company believes that the aggregate provisions recorded for potential losses in these Consolidated Condensed Interim Financial Statements are adequate based upon currently available information. However, if management’s estimates prove incorrect, current reserves could be inadequate and the Company could incur a charge to earnings which could have a material adverse effect on its results of operations, financial condition, net worth and cash flows.

A summary description of Tenaris’s material outstanding legal proceedings as of June 30, 2026, is included in note 18 “Contingencies, commitments and restrictions on the distribution of profits“ to our unaudited consolidated condensed interim financial statements included in this half-year report.

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Business Overview

Operating and Financial Review and Prospects

The following discussion and analysis should be read in conjunction with the audited consolidated financial statements and the related notes included in our annual report for the year ended December 31, 2025, and is based on, and should be read in conjunction with, the unaudited consolidated condensed interim financial statements for the six-month period ended June 30, 2026, included in this half-year report.

Certain information contained in this discussion and analysis and presented elsewhere in this half-year report, including information with respect to our plans and strategy for our business, includes forward-looking statements that involve risks and uncertainties. See “Cautionary Statement Concerning Forward-Looking Statements” in this half-year report. In evaluating this discussion and analysis, you should specifically consider the various risk factors identified in “Principal Risks and Uncertainties”, other risk factors identified elsewhere in this half-year report and other factors that could cause results to differ materially from those expressed in such forward-looking statements.

Market Background and Outlook

Oil and gas drilling activity has been increasing in the USA, Canada and Argentina. In addition, customers around the world are moving forward with investments in cost-competitive offshore projects, as the industry increases its focus on security and diversification of supply.

In the United States, OCTG prices have been increasing in response to higher demand and to offset higher raw material and logistic costs.

In the Middle East, the conflict continues to cause disruption to shipping through the strait of Hormuz. Drilling activity in Iraq, Kuwait and Qatar has been severely affected, while, in Saudi Arabia and the UAE, it has been largely maintained.

In the second half, we expect our sales and EBITDA to remain in line with the first half, despite sales continuing to be affected by lower shipments to the Middle East and higher raw material costs. There may be some upside if the shipping disruption at the strait of Hormuz ends before the end of the year. The third quarter will be additionally affected by seasonality and product mix effects, while the fourth quarter will benefit from higher prices and volumes in most regions.

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Results of Operations

Selected income statement data

Selected consolidated financial position data

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Six-month period ended June 30, 2026, compared to six-month period ended June 30, 2025

Summary

Our sales in the first half of 2026 increased 1% compared to the first half of 2025 as volumes of tubular products shipped decreased 1% and tubes average selling prices increased 2% driven by price increases in North America while sales in the Others segment increased 3%. EBITDA in the first half of 2026 was negatively affected by the impact of tariff costs in the United States. Earnings per share increased 4% following the reduction of outstanding shares due to the share buyback.

Cash flow provided by operating activities amounted to $1.1 billion during the first half of 2026, net of an increase in working capital of $84 million. After capital expenditures of $236 million, our free cash flow amounted to $0.9 billion. Following a dividend payment of $606 million and share buybacks for $90 million in the semester, our net cash position amounted to $3.6 billion at the end of June 2026.

The following table shows our net sales by business segment for the periods indicated below:

Tubes

The following table indicates for our Tubes business segment, sales volumes of seamless and welded pipes for the periods indicated below:

The following table indicates, for our Tubes business segment, net sales by geographic region, operating income and operating income as a percentage of net sales for the periods indicated below:

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Net sales of tubular products and services increased 1% to $5,734 million in the first half of 2026, compared to $5,686 million in the first half of 2025 due to a 1% decrease in volumes and a 2% increase in average selling prices driven by price increases in North America. Average drilling activity in the first half of 2026 declined 3% in the United States and Canada and 2% internationally compared to the first half of 2025.

Operating results from tubular products and services amounted to a gain of $1,010 million in the first half of 2026 compared to a gain of $1,068 million in the first half of 2025. The decline in operating results is mainly due to the impact of tariff costs in the United States.

Others

The following table indicates, for our Others business segment, net sales, operating income and operating income as a percentage of net sales for the periods indicated below:

Net sales of other products and services increased 3% to $333 million in the first half of 2026, compared to $322 million in the first half of 2025. The increase is mainly due to additional sales of excess raw materials.

Operating results from other products and services amounted to a gain of $68 million in the first half of 2026, compared to a gain of $65 million in the first half of 2025. These results were primarily driven by our oilfield services business in Argentina and by sales of sucker rods, pipes for plumbing applications, and coiled tubing.

Selling, general and administrative expenses, or SG&A, amounted to $951 million in the first half of 2026 and $941 million in the first half of 2025 in both cases representing 15.7% of sales.

Other operating results amounted to a loss of $6 million in the first half of 2026, compared to a loss of $50 thousand in the first half of 2025. The six million loss is mainly due to the provision for ongoing litigation related to the acquisition of a participation in Usiminas.

Financial results amounted to a gain of $83 million in the first half of 2026, compared to a gain of $67 million in the first half of 2025. Financial results of the semester are mainly attributable to a $94 million net finance income from the net return of our portfolio investments.

Equity in earnings of non-consolidated companies generated a gain of $81 million in the first half of 2026, compared to a gain of $47 million in the first half of 2025. These results are mainly derived from our participation in Ternium (NYSE:TX) and Usiminas.

Income tax amounted to a charge of $185 million in the first half of 2026, compared to $187 million in the first half of 2025.

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Liquidity and Capital Resources

The following table provides certain information related to our cash generation and changes in our cash and cash equivalents position for the periods indicated below:

Net cash provided by operating activities during the first half of 2026 amounted to $1.1 billion (net of an increase in working capital of $84 million), compared to cash provided by operations of $1.5 billion (including a reduction in working capital of $250 million) in the first half of 2025.

Capital expenditures amounted to $236 million in the first half of 2026, compared to $309 million in the first half of 2025. Free cash flow amounted to $0.9 billion in the first half of 2026, compared to $1.2 billion in the first half of 2025.

Following a dividend payment of $606 million in May 2026 and share buybacks of $90 million during the first half of 2026, our net cash position amounted to $3.6 billion at the end of June 2026.

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Other Significant Events of the Period

Annual General Meeting of Shareholders

On May 12, 2026, the Company’s annual general meeting of shareholders approved all resolutions on its agenda.

Among other resolutions adopted at the annual general meeting, shareholders acknowledged the Company’s consolidated annual management report for the year ended December 31, 2025, which includes the following information and certifications required by applicable law: (i) consolidated financial and non-financial information (or sustainability statement) for the year ended December 31, 2025; (ii) related management certifications on the Company's consolidated financial statements as of and for the year ended December 31, 2025, and on the annual accounts as at December 31, 2025; and (iii) external auditors' reports on such consolidated financial statements, annual accounts and non-financial information (or sustainability statement). The annual meeting also approved the consolidated financial statements as of and for the year ended December 31, 2025, and the annual accounts as of December 31, 2025.

The shareholders approved an annual dividend of US$0.89 per share (or US$1.78 per ADS), which represents an aggregate sum of approximately US$0.9 billion, and which includes the interim dividend of US$0.29 per share (US$0.58 per ADS), or approximately US$0.3 billion, paid in November 2025. Tenaris paid the balance of the annual dividend in the amount of US$0.60 per share entitled to dividends (or US$1.20 per ADS), in U.S. dollars, which represents approximately US$0.6 billion, on May 20, 2026; with a record date of May 19, 2026, and an ex-dividend date of May 18, 2026, for securities listed in Europe and Mexico and an ex-dividend of May 19, 2026 for securities listed in the United States.

The annual meeting resolved to reduce the number of directors to ten and to re-appoint Mr. Simon Ayat, Mr. Roberto Bonatti, Mr. Germán Curá, Ms. Molly Montgomery, Ms. Maria Novales-Flamarique, Mr. Gianfelice Mario Rocca, Mr. Paolo Rocca, Mr. Jaime Serra Puche, Ms. Monica Tiuba and Mr. Guillermo Vogel to the board of directors. All board members will hold office until the meeting that will be convened to decide on the 2026 annual accounts. In a subsequent meeting, the board of directors re-elected Mr. Paolo Rocca as chairman, Mr. Vogel and Mr. Curá as vice-chairmen, and Mr. Ayat, Mr. Serra Puche and Ms. Tiuba as audit committee members, with Ms. Tiuba continuing to serve as the committee’s chair. All members of the audit committee qualify as independent directors for purposes of the U.S. Securities Exchange Act Rule 10A-3(b)(1) and under the Company’s articles of association. The board of directors also confirmed Mr. Gabriel Podskubka as Chief Executive Officer.

In addition, the annual general meeting approved the compensation payable to the members of the Board for the year ending December 31, 2026, and the Compensation Report for the year 2025. The shareholders appointed Forvis Mazars, Cabinet de révision agreé, as the Company’s statutory auditor for the fiscal year ending December 31, 2026, and approved their corresponding fees for audit and audit-related services.

Finally, the annual meeting renewed the authorization to purchase, acquire or receive, from time to time, Company shares, including shares represented by ADRs, on such terms and conditions as may be approved by the board of directors within the limit of the shareholders’ authorization.

Extraordinary General Meeting of Shareholders

The extraordinary general meeting of shareholders, held immediately after the annual general meeting, resolved to approve the cancellation of 62,355,174 ordinary shares held in treasury by the Company acquired throughout the third share buyback program, which ran from June 9, 2025 to March 3, 2026, and resolved to approve the corresponding reduction of the issued share capital. As a result, effective May 12, 2026, the share capital of the Company is reduced from US$1,071,994,930 (represented by 1,071,994,930 shares with a par value of US$1 per share) to US$1,009,639,756 (represented by 1,009,639,756 shares with a par value of US$1 per share). The extraordinary meeting also approved the corresponding amendment to article 5 of the articles of association to reflect the adopted resolutions.

Copies of the minutes of the annual general meeting and extraordinary general meeting of shareholders, and a copy of the amended articles of association can be downloaded from Company’s website at ir.tenaris.com/corporate-governance/annual-general-meeting.

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Tenaris's CEO succession

On May 6, 2026, the Company announced that its board of directors had appointed Mr. Gabriel Podskubka as Chief Executive Officer and that Mr. Paolo Rocca would continue to serve as chairman of the board, reflecting the culmination of a long-term leadership planning process.

Agreement for acquisition of Artrom Steel Tubes S.A.

On May 8, 2026, the Company announced that it had entered into a definitive agreement to acquire from GLGH Steel, LLC, a U.S.-based company, 100% of the share capital of Artrom Steel Tubes S.A. ("Artrom"), for an aggregate purchase price of EUR86 million, on a cash-free and debt-free basis, including a normalized level of working capital. Artrom is a Romanian manufacturer of steel and seamless steel pipes, with annual steelmaking capacity of approximately 450,000 metric tons at its facility in Reșița and seamless pipe rolling capacity of up to 200,000 metric tons at its Slatina facility. The transaction is subject to customary regulatory conditions, including clearance from the European Union competition authorities and Romanian government approvals, and closing is expected to occur during the fourth quarter of 2026. The acquisition is expected to expand Tenaris's industrial pipe product range and manufacturing footprint, strengthening its ability to serve customers in the European industrial segment.

Share Buyback Programs

In November 2023, the Company’s board of directors approved a share buyback program of up to $1.2 billion, which was divided into four tranches and ran from November 5, 2023, to (and including) August 2, 2024, under which the Company repurchased 71,679,768 ordinary shares, representing 6.07% of the Company’s issued share capital as measured at the beginning of the first program, for a total consideration of approximately $1.2 billion (excluding incidental transaction fees).

The shares acquired during the first tranche of the first share buyback program were cancelled at the extraordinary shareholders meeting held on April 30, 2024, and the remaining shares acquired during the second, third and fourth tranches of the first share buyback program were cancelled at the extraordinary shareholders meeting held on May 6, 2025, as further described below.

In November 2024, the Company’s board of directors approved a follow-on share buyback program of up to $700 million (excluding incidental transaction fees), subject to a maximum of 46,373,915 ordinary shares, representing the remaining 3.93% of the Company’s issued share capital (measured as of the launch of the first share buyback program), to complete the maximum of 10% of the share capital that could be repurchased by the Company at the time.

During the second share buyback program, which ran from November 11, 2024, to (and including) March 4, 2025, the Company repurchased 36,862,132 ordinary shares, representing 3.12% of the Company’s issued share capital as measured at the beginning of the first share buyback program, for a total consideration of approximately $700 million (excluding incidental transaction fees).

On May 6, 2025, the extraordinary shareholders meeting approved the cancellation of 90,762,598 ordinary shares held in treasury by the Company, which had been acquired during the second, third and fourth tranches of the first share buyback program and second share buyback program, and resolved to approve the corresponding reduction of the issued share capital of the Company and the amendment of the first paragraph of article 5 of the Company’s articles of association. As a result, effective May 6, 2025, the share capital of the Company was reduced from $1,162,757,528 (represented by 1,162,757,528 shares with a par value of $1 per share) to $1,071,994,930 (represented by 1,071,994,930 shares with a par value of $1 per share).

Half-year report 2026 - Interim management report

In May 2025, the Company’s board of directors approved a third share buyback program of up to $1.2 billion (excluding incidental transaction fees), divided into two tranches. The first tranche of the program, which covered up to $600 million (excluding incidental transaction fees), ran from June 9, 2025, to (and including) September 30, 2025. Under the first tranche of the program, the Company repurchased 33,059,955 ordinary shares, representing 3.08% of the Company’s issued shares as measured at the beginning of the first tranche of the program, for a total consideration of approximately $584 million (excluding incidental transaction fees). The second tranche of the third share buyback program, which covered up to $600 million (excluding incidental transaction fees), ran from November 3, 2025, and was originally scheduled to end no later than April 30, 2026. Under the second tranche of the program, the Company repurchased 29,295,219 ordinary shares, representing 2.73% of the Company's issued shares as measured at the beginning of the second tranche of the program, for an aggregate consideration of approximately $583.6 million (excluding incidental transaction fees), thereby substantially completing its targeted repurchases.

On February 23, 2026, the Company announced its decision to terminate, effective March 3, 2026, the second tranche of the third share buyback program. In a context of high volatility in the market, allowing the second tranche of the program to continue as initially scheduled would, by application of the customary mechanics in the existing buyback agreement, have resulted in a significant incremental pay-out to its counterparty. Accordingly, following the expiration of the blackout period corresponding to the Company’s annual earnings release on February 20, 2026, the Company exercised its right to terminate its existing buyback agreement on the first date it was allowed to do so under the terms of the agreement, and in March 2026, paid the incidental transaction fees.

All shares acquired by the Company under its share buyback programs, and held in treasury, were cancelled by extraordinary general meetings of shareholders and the issued share capital and legal reserve of the Company were reduced accordingly.

During the six-month period ended June 30, 2026, the Company purchased 2,184,202 shares, for approximately $89.6 million (including a negative performance amount of $47.1 million). During the six-month period ended June 30, 2025, the Company purchased 12,277,261 shares, for approximately $235 million under the second share buyback program and purchased 13,094,268 shares, for approximately $237 million under the third share buyback program.

There were no ordinary shares held in treasury by the Company as of June 30, 2026. As of June 30, 2025, the Company held in treasury the 13,094,268 ordinary shares repurchased under the third share buyback program.

Further information on the share buyback programs and share repurchases thereunder is available on Tenaris’s corporate website under the Share Buyback Program Section and note 23 "Share buyback programs" to our unaudited consolidated condensed interim financial statements included in this half-year report.

Changes in the Company's Board of Directors

In the meeting held on August 5, 2026, the Company’s Board of Directors has been informed that Mr. Jaime Serra Puche has resigned as a member of the Board and of its Audit Committee, for personal reasons, and that, due to other commitments, Mr. Germán Curá has resigned as Vice Chair responsible for overseeing Tenaris’s Sustainability Strategy but will continue to serve as a director.

Pursuant to the authority granted to the Board of Directors under Luxembourg law and the Company's articles of association, the Board has appointed Ms. Alicia Móndolo as a member of the Board until the Company’s next shareholders meeting and as Vice Chair responsible for overseeing the Company's Sustainability Strategy, Risk Management and Compliance, and Ms. Maria Novales-Flamarique as a member of the Audit Committee.

These changes will be effective upon the publication of the Company's unaudited financial statements for the second quarter of 2026. Following such changes, the Board of Directors will be composed of ten members, as follows: Mr. Paolo Rocca, Chairman; Mr. Guillermo Vogel, Vice Chair responsible for overseeing Financial Reporting and Investor Relations; Ms. Alicia Móndolo, Vice Chair responsible for overseeing Sustainability, Risk Management and Compliance; Ms. Monica Tiuba; Mr. Simon Ayat; Ms. Maria Novales-Flamarique; Mr. Gianfelice Rocca; Mr. Roberto Bonatti; Mr. Germán Curá; and Ms. Molly Montgomery. Each of Ms. Tiuba, Mr. Ayat, Ms. Novales-Flamarique and Ms. Montgomery qualify as independent directors.

The Audit Committee will be composed of Ms. Monica Tiuba, as Chair, Mr. Simon Ayat and Ms. Maria Novales-Flamarique.

Half-year report 2026 - Interim management report

Related Party Transactions

Tenaris is a party to several related party transactions which include, among others, purchases and sales of goods (including steel pipes, flat steel products, steel bars, raw materials, gas and electricity) and services (including engineering services and related services) from or to entities controlled by San Faustin S.A., or in which San Faustin holds significant interests. Material related party transactions are subject to the review of the audit committee of the Company’s board of directors and the requirements of the Company’s articles of association and Luxembourg law. For further detail on Tenaris’s related party transactions, see note 22 “Related party transactions” to our unaudited consolidated condensed interim financial statements included in this half-year report.

Half-year report 2026 - Interim management report

MANAGEMENT CERTIFICATION

We confirm, to the best of our knowledge, that:

s/ Gabriel Podskubka

Chief Executive Officer

Gabriel Podskubka

August 5, 2026

s/ Carlos Gómez Álzaga

Chief Financial Officer

Carlos Gómez Alzaga

August 5, 2026

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

CONSOLIDATED CONDENSED INTERIM INCOME STATEMENTS

^(*) Number of outstanding shares as of June 30, 2026, and 2025, was 1,009,639,756 and 1,058,900,662, respectively.

^(**) Each ADS equals two shares.

The accompanying notes are an integral part of these Consolidated Condensed Interim Financial Statements.

These Consolidated Condensed Interim Financial Statements should be read in conjunction with our audited Consolidated Financial Statements and notes for the fiscal year ended December 31, 2025.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

CONSOLIDATED CONDENSED INTERIM STATEMENTS OF OTHER COMPREHENSIVE INCOME

The accompanying notes are an integral part of these Consolidated Condensed Interim Financial Statements.

These Consolidated Condensed Interim Financial Statements should be read in conjunction with our audited Consolidated Financial Statements and notes for the fiscal year ended December 31, 2025.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

CONSOLIDATED CONDENSED INTERIM STATEMENTS OF FINANCIAL POSITION

The accompanying notes are an integral part of these Consolidated Condensed Interim Financial Statements.

These Consolidated Condensed Interim Financial Statements should be read in conjunction with our audited Consolidated Financial Statements and notes for the fiscal year ended December 31, 2025.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

CONSOLIDATED CONDENSED INTERIM STATEMENTS OF CHANGES IN EQUITY

⁽¹⁾ The Company has an authorized share capital of a single class of 2.5 billion shares having a nominal value of USD1.00 per share. As of June 30, 2026, there were 1,009,639,756 shares issued. All issued shares are fully paid.

⁽²⁾ As of June 30, 2026, the Company held no treasury shares. For further information, see Note 23.

⁽³⁾ On May 12, 2026, the extraordinary general meeting of shareholders approved the cancelation of 62,355,174 ordinary shares held in treasury by the Company and the corresponding reduction of the issued share capital of the Company and, accordingly, the legal reserve was proportionally reduced.

⁽⁴⁾ Other reserves include mainly the result of transactions with non-controlling interests that do not result in a loss of control, the remeasurement of post-employment benefit obligations, the changes in value of cash flow hedges and in financial instruments measured at fair value through other comprehensive income and the changes in the share buyback program liability.

⁽⁵⁾ The restrictions to the distribution of profits and payment of dividends according to Luxembourg Law are disclosed in note 18.

The accompanying notes are an integral part of these Consolidated Condensed Interim Financial Statements.

These Consolidated Condensed Interim Financial Statements should be read in conjunction with our audited Consolidated Financial Statements and notes for the fiscal year ended December 31, 2025.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

⁽¹⁾ The Company had an authorized share capital of a single class of 2.5 billion shares having a nominal value of USD1.00 per share. As of June 30, 2025, there were 1,071,994,930 shares issued. All issued shares are fully paid.

⁽²⁾ As of June 30, 2025, the Company held 13,094,268 treasury shares, and there were 1,058,900,662 outstanding shares. For more information, see note 23.

⁽³⁾ On May 6, 2025, the extraordinary general meeting of shareholders approved the cancelation of 90,762,598 ordinary shares held in treasury by the Company and the corresponding reduction of the issued share capital of the Company and, accordingly, the legal reserve was proportionally reduced.

⁽⁴⁾ Other reserves include mainly the result of transactions with non-controlling interests that do not result in a loss of control, the remeasurement of post-employment benefit obligations, the changes in value of cash flow hedges and in financial instruments measured at fair value through other comprehensive income and the changes in the share buyback program liability.

⁽⁵⁾ The restrictions to the distribution of profits and payment of dividends according to Luxembourg Law are disclosed in note 18.

The accompanying notes are an integral part of these Consolidated Condensed Interim Financial Statements.

These Consolidated Condensed Interim Financial Statements should be read in conjunction with our audited Consolidated Financial Statements and notes for the fiscal year ended December 31, 2025.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

CONSOLIDATED CONDENSED INTERIM STATEMENTS OF CASH FLOWS

^(*) Changes in working capital do not include non-cash movements due to the variations in the exchange rates used by subsidiaries with functional currencies different from the U.S. dollar for an amount of $13.1 million for the six-month period ended June 30, 2026, and $(36.7) million for the six-month period ended June 30, 2025.

^(**) For the six-month period ended June 30, 2025, related to the deconsolidation of Amaja Tubular Services Limited.

^(***) For the six-month period ended June 30, 2026, mainly related to the acquisition of the oilfield division of AllTorque. For more information see note 24.

The accompanying notes are an integral part of these Consolidated Condensed Interim Financial Statements.

These Consolidated Condensed Interim Financial Statements should be read in conjunction with our audited Consolidated Financial Statements and notes for the fiscal year ended December 31, 2025.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

NOTES TO THE CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

NOTES TO THE CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS

Tenaris S.A. (the "Company") was established as a public limited liability company (société anonyme) under the laws of the Grand-Duchy of Luxembourg on December 17, 2001. The Company holds, either directly or indirectly, controlling interests in various subsidiaries in the steel pipe manufacturing and distribution businesses. References in these Consolidated Condensed Interim Financial Statements to “Tenaris” refer to Tenaris S.A. and its consolidated subsidiaries. A list of the Company’s principal subsidiaries is included in note 33 to the Company’s audited Consolidated Financial Statements for the year ended December 31, 2025.

The Company’s shares trade on the Italian Stock Exchange and the Mexican Stock Exchange, and its American Depositary Securities (“ADS”) trade on the New York Stock Exchange.

These Consolidated Condensed Interim Financial Statements were approved for issuance by the Company’s Board of Directors on August 5, 2026.

These Consolidated Condensed Interim Financial Statements have been prepared in accordance with IAS 34, “Interim Financial Reporting” as issued by the International Accounting Standards Board (“IASB”) and as adopted by the European Union (“EU”). The accounting policies used in the preparation of these Consolidated Condensed Interim Financial Statements are consistent with those used in the audited Consolidated Financial Statements for the year ended December 31, 2025. These Consolidated Condensed Interim Financial Statements should be read in conjunction with the audited Consolidated Financial Statements for the year ended December 31, 2025, which have been prepared in accordance with IFRS Accounting Standards as issued by the IASB and in conformity with IFRS as adopted by the EU.

The preparation of Consolidated Condensed Interim Financial Statements requires management to make certain accounting estimates and assumptions that might affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities as of the reporting dates, and the reported amounts of revenues and expenses for the reported periods. Actual results may differ from these estimates. The main areas involving significant estimates or judgments are impairment of long-lived assets; impairment of investments in associates; income taxes -including recoverability of deferred tax assets-; allowance for obsolescence of inventory; contingencies; allowance for trade receivables; post-employment and other long-term benefits; business combinations; useful lives of property, plant and equipment and other long-lived assets and fair value estimation of certain financial instruments. During the period there were no material changes in the significant accounting estimates and judgements.

Tenaris carefully assesses the potential impact of climate change and energy transition on its business and the risks to its markets and its tangible and intangible assets and adapts its business strategy accordingly. These events did not impact materially management judgments and estimates used in the preparation of these Consolidated Condensed Interim Financial Statements. For further information, see note 36 to our audited Consolidated Financial Statements for the year ended December 31, 2025.

Material intercompany transactions, balances and unrealized gains (losses) on transactions between Tenaris’s subsidiaries have been eliminated in consolidation. However, since the functional currency of some subsidiaries is their respective local currency, some financial gains (losses) arising from intercompany transactions are generated. These are included in the Consolidated Condensed Interim Income Statements under Other financial results, net.

There were no significant changes in valuation techniques during the period and there have been no changes in any risk management policies since the year ended December 31, 2025.

If necessary, comparative amounts have been reclassified to conform to changes in presentation in the current period.

None of the accounting pronouncements applicable after December 31, 2025, and as of the date of these Consolidated Condensed Interim Financial Statements had a material effect on the Company’s financial condition or result of its operations.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

Reportable operating segments

(All amounts in millions of U.S. dollars)

There are no material differences between IFRS and management views in total revenues.

The differences between operating income under the IFRS and management views are mainly related to the cost of goods sold, reflecting the effect of raw materials prices variations on the valuation of the replacement cost considered for management view compared to IFRS cost calculated at historical cost on a FIFO basis, and other timing differences. For more information see note II.C “Segment information” in the Company’s audited Consolidated Financial Statements for the year ended December 31, 2025.

The main differences in net income under the IFRS and management views arise from the impact of functional currencies on financial result, deferred income taxes as well as the equity in earnings of non-consolidated companies.

Geographical information

Allocation of net sales to geographical information is based on the final destination of the products sold.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

There are no revenues from external customers attributable to the Company’s country of incorporation (Luxembourg). The principal countries from which the Company derives its revenues are USA, Argentina, Canada, Saudi Arabia, Mexico and United Arab Emirates.

The Company’s largest customer accounted for approximately 10% of revenues from third parties in the six-month period ended June 30, 2026, while no single customer accounted for more than 10% of revenues from third parties in the corresponding period of 2025. These revenues were attributable to the Company’s Tubes segment.

Revenue is mainly recognized at a point in time to direct customers, when control has been transferred and there is no unfulfilled performance obligation that could affect the acceptance of the product by the customer. In the six-month periods ended June 30, 2026, and 2025, revenues related to governmental institutions represented approximately 23% and 26%, respectively.

Tubes segment revenues by market:

(All amounts in millions of U.S. dollars)

The table above includes revenues from services performed on third party tubes of $199.5 million and $210.8 million for the six-month periods ended June 30, 2026, and 2025, respectively.

^(*) For the six-month period ended June 30, 2026, related to the purchase price allocation arising from the acquisition of a scrap processing business in Beaver Falls, Pennsylvania. For more information see note 24.

^(**) For the six-month period ended June 30, 2025, related to the deconsolidation of Amaja Tubular Services Limited.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

Provision for the ongoing litigation related to the acquisition of participation in Usiminas: this item relates to the provision described in note 18, without reflecting any net foreign exchange result associated thereto.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

Interest income: For the six-month period ended June 30, 2026, includes $20.0 million of interest related to instruments carried at FVTPL and includes $37.0 million of interest related to instruments carried at FVTOCI.

For the six-month period ended June 30, 2025, includes $16.0 million of interest related to instruments carried at FVTPL and includes $47.4 million of interest related to instruments carried at FVTOCI.

Other: For the six-month period ended June 30, 2025, includes a loss of approximately $15.8 million related to fees paid in connection with a collection involving the Company’s Mexican subsidiary.

Earnings from non-consolidated companies: These results are mainly derived from our investments in Ternium and Usiminas.

Tenaris is within the scope of the OECD Pillar Two model rules. Pillar Two legislation was adopted in Luxembourg, the jurisdiction in which the Company is incorporated, and came into effect as from January 1, 2024. Tenaris applies the exception regarding the recognition and disclosure of deferred tax assets and liabilities related to Pillar Two income taxes, as provided in the amendments to IAS 12 issued in May 2023.

In the six-month periods ended June 30, 2026 and 2025, Tenaris recognized an estimated current tax expense related to Pillar Two, amounting to $6.8 million and $11.3 million, respectively.

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated

On May 12, 2026, the Company’s shareholders approved an annual dividend of $0.89 per outstanding share ($1.78 per ADS), which represents an aggregate sum of approximately US$0.9 billion, and which includes the interim dividend of $0.29 per outstanding share ($0.58 per ADS) paid on November 26, 2025. The remaining balance, amounting to $0.60 per outstanding share ($1.20 per ADS), which represents approximately $0.6 billion, was paid on May 20, 2026.

On May 6, 2025, the Company’s shareholders approved an annual dividend of $0.83 per outstanding share ($1.66 per ADS), which represented an aggregate sum of approximately US$0.9 billion, and which included the interim dividend of $0.27 per outstanding share ($0.54 per ADS) paid on November 20, 2024. The remaining balance, amounting to $0.56 per outstanding share ($1.12 per ADS), which represented approximately $0.6 billion, was paid on May 21, 2025.

^(*) For the six-month period ended June 30, 2026, related to the acquisition of the oilfield division of AllTorque and the purchase price allocation arising from the acquisition of a scrap processing business in Beaver Falls, Pennsylvania. For more information see note 24.

^(**) For the six-month period ended June 30, 2025, includes the unwinding of certain land plots in Saudi Arabia.

^(***) For the six-month period ended June 30, 2025, related to the deconsolidation of Amaja Tubular Services Limited.

The Company’s Brazilian subsidiary, Confab Industrial S.A. (“Confab”), holds certain real estate assets, with a carrying value of $32.4 million, that are subject to a judicial mortgage aimed at securing the indemnification potentially payable to Companhia Siderúrgica Nacional (“CSN") under a lawsuit brough by CSN against Confab and other related companies. The litigation is currently pending, and no amount is currently owed by Confab. See note 18 “Contingencies, commitments and restrictions on the distribution of profits - Contingencies - CSN claims relating to the January 2012 acquisition of Usiminas” to these Consolidated Condensed Interim Financial Statements.

The Company’s Saudi Arabian subsidiary, Global Pipe Company (“GPC”), holds certain assets with a carrying value of $37.7 million that are pledged as security for current borrowings. Tenaris holds an indirect participation of 27.6% in GPC through its subsidiary, Saudi Steel Pipe Company (“SSPC”).

Consolidated Condensed Interim Financial Statements For the six-month period ended June 30, 2026 - all amounts in thousands of U.S. dollars, unless otherwise stated