TENARIS SA

Unless otherwise specified or if the context so requires:

• References in this annual report to “Tenaris”, “we”, “us” or “our” are to Tenaris S.A. and its consolidated subsidiaries. See “II. Accounting Policies A. Basis of presentation” and “II. Accounting Policies B. Group accounting” to our audited consolidated financial statements included in this annual report.

• References in this annual report to “the Company” are exclusively to Tenaris S.A., a Luxembourg société anonyme.

• References in this annual report to “San Faustin” are to San Faustin S.A., a Luxembourg société anonyme and the Company’s controlling shareholder.

• “ADSs” refers to the American Depositary Shares, which are evidenced by American Depositary Receipts, and represent two shares each.

• “API” refers to the American Petroleum Institute.

• “ARS” refers to the Argentine peso.

• “billion” refers to one thousand million, or 1,000,000,000.

• “BRL” refers to the Brazilian real.

• “CBAM” refers to the EU Carbon Border Adjustment Mechanism.

• “CCS” refers to carbon capture and storage.

• “CSDDD” refers to the Corporate Sustainability Due Diligence Directive.

• “CSRD” refers to the Corporate Social Responsibility Directive.

• “DMA” refers to the Double Materiality Assessment.

• “EAF” refers to electric arc furnaces.

• “EC” refers to the European Commission.

• “EFRAG” refers to the European Financial Reporting Advisory Group.

• “EMS” refers to the Environmental Management System.

• “ESRS” refers to the European Sustainability Reporting Standards.

• “ETS” refers to EU Emissions Trading System.

• “EU” refers to the European Union.

• “EUR” refers to the Euro.

• “FCPA” refers to the U.S. Foreign Corrupt Practices Act.

• “GHG” refers to greenhouse gas.

• “IFRS” refers to International Financial Reporting Standards.

• “IPCC” refers to the Intergovernmental Panel on Climate Change.

• “ISO” refers to the International Organization for Standardization.

• “ksi” refers to kilopound per square inch.

• “NYSE” refers to the New York Stock Exchange.

• “OCTG” refers to oil country tubular goods. See “Information on the Company – Business Overview – Our Products”.

• “OPEC” refers to the Organization of Petroleum Exporting Countries.

• “QHSE” refers to Quality, Health, Safety, and Environment.

• “QMS” refers to the Quality Management System.

• “R&D” refers to research and development.

• “RCP” refers to the Representative Concentration Pathway.

• “SAR” refers to the Saudi Arabian Riyal.

• “SEC” refers to the U.S Securities and Exchange Commission.

• “shares” refers to ordinary shares, par value $1.00, of the Company.

• “tons” refers to metric tons; one metric ton is equal to 1,000 kilograms, 2,204.62 pounds, or 1.102 U.S. (short) tons.

• “UK” refers to the United Kingdom.

• “U.S. dollars”, “US$”, “USD” or “$” each refers to the United States dollar.