#1Investor Presentation Tenaris#2Disclaimer This presentation contains "forward-looking statements." Forward-looking statements are based on management's current views and assumptions and involve known and unknown risks that could cause actual results, performance or events to differ materially from those expressed or implied by those statements. These statements include information regarding management strategy, investment plans, development and growth of the steel pipe and oil and gas industries, trends and other prospective data, including trends regarding the development of raw material costs and the levels of investment in oil and gas drilling worldwide and general economic conditions in the countries where Tenaris operates and sells its products and services. We do not undertake to update any forward-looking statement to reflect events or circumstances after the date of this document or to reflect the occurrence of unanticipated events. Except where otherwise stated, the data presented herein is based on Tenaris analysis and estimates. Investor Presentation Tenaris April 2022 2#3Global Leader in Steel Pipes for the • Energy Industry • Manufacturing facilities in 16 countries Annual steel pipe manufacturing capacity of 4.7 million tons of seamless pipes 3.2 million tons of welded pipes ⚫ 5 Electric steel shops, the least CO2 intensive steel production route 2021 Sales by Region (US$6.5 Bn) Middle East & Asia Pacific, 4% Africa, 13%. • R&D centers in 3 countries Service and distribution network in 25 countries • 23,000 employees (Dec.2021) • Revenue: US$ 6.5 billion (2021) • Stock exchange listings: New York, Italy and Mexico Europe, 11% South America, 20% North America, 52% Investor Presentation Tenaris April 2022 3#4Sustaining values • Protect our employees, prioritizing safety, health and well-being in the workplace. Reduce our environmental footprint and contribute to global and regional goals addressing climate change risk. 2.4 Lost time injury frequency rate 1.8 1.1 1.1 1.0 Develop integrated product and service solutions that meet customer requirements while enhancing safety, efficiency and reliability, and minimizing environmental impact through the supply chain. 2017 2018 Accidents per million hours worked 2019 2020 2021 7.0 CO2 emissions 1.5 CO2 Intensity (right axis) 6.0 Support inclusive growth in the communities where we work and live. Million tons CO2 5.0 3.2 1 4.0 Scope 3 2.3 1.7 3.0 1.0 Scope 2 0.8 1.3 0.8 0.5 2.0 0.4 1.0 2.0 Scope 1 1.8 1.9 1.1 • Foster a corporate culture of transparency and integrity based on ethical behavior and compliance with the law. 0.0 0 2018 2019 2020 2021 Investor Presentation Tenaris Tons CO2/tons steel April 2022 4#5Decarbonization program -30% REDUCTION IN CO₂ INTENSITY TARGET 2030 per ton of steel (Scopes 1, 2 & 3) vs. 2018 values USD 80 Internal carbon per ton CO, price Collaboration with Increased Renewable scrap use electricity Energy efficiency H₂ use H₂ partners to minimize CO, footprint Alternative raw materials Carbon capture, use and storage USD 190 million investment project to build a wind farm in Argentina, which will supply close to 50% of Siderca's electric energy requirements. Working with industry partners to develop technologies involving the use of hydrogen and carbon capture. Investor Presentation Tenaris April 2022 5#6Worldwide Operations Hammerfest Flora Tananger Stavanger Aberdeen Moscow ■ Aksai Amsterdam Luxembourg Lugano Dalmine Paris Essen Silcotub Campina Ploiesti Aktau Calarasi Bucharest Baku Baotou Beijing Yulin m Seoul NKKTubes Grande Prairie Edmonton Nisku Calgary Red Deer Bienfait AlgomaTubes St. John's Toronto Wilder Pittsburgh Denver Bakersfield Oklahoma City = Conroe Midland Houston Bay City Hickman Beech Bottom Baytown Westwego Brookfield Koppel Ambridge Algiers Freeport Monterrey Reynosa Poza Rica Guadalajara Tampico Taisa Ciudad del Carmen Mexico City Petropark Dos Bocas Comalcalco Maracaibo Villahermosa Caracas Lagos TuboCaribe Barrancabermejam Асста Georgetown Onne Bogotá Takoradi Villavicencio Quito Machachi El Coca Luanda Lima Investor Presentation Sta. Cruz de la Sierra mm Confab Rio das Ostras Rio de Janeiro Villa Constitución Siderca Santiago Montevideo Villa Mercedes Siat Senillosa Neuquén Comodoro Rivadavia Tenaris Alexandria Cairo Bahrain Dammam Doha Saudi Steel Pipe Dubai Abu Dhabi Manufacturing Centers R&D Centers Qingdao Chí Minh Ho Chi Singapore Batam Sorong SPLJ Jakarta Darwin Perth Dampier Service Centers Commercial/Administrative Offices April 2022 60#7Global OCTG Demand [Mill Tn] 17.7 4.8 15.4 15.4 13.9 14.1 11.8 5.5 11.7 5.9 11.0 5.1 5.0 ■ CHINA & RUSSIAN AREA 3.8 9.6 ■ INTERNATIONAL 4.4 1.1 LATIN AMERICA 5.4 3.3 5.4 3.9 2.5 3.3 2.8 2.6 0.5 0.6 0.7 0.8 2.3 0.8 2.4 2.7 8.0 0.5 5.8 5.9 0.6 5.5 5.5 4.0 3.5 2.3 2.8 2014 2015 2016 2017 2018 2019 2020 2021 2022F Investor Presentation Tenaris ■ USA & CANADA April 2022 7#8Differentiated Products Full range of high quality products (seamless and welded pipes, premium connections, large OD OCTG and connectors, line pipe, mechanical pipe, accessories, sucker rods and coiled tubing) for use in all types of oil and gas drilling, well completion and transportation activities. Select industrial applications: airbags, cranes, hydraulic cylinders. Product portfolio for the energy transition: hydrogen storage and transportation, carbon capture, use and storage (CCUS) and geothermal energy. Blue® Series BlueDockⓇ Connector Dopeless® technology Airbag inflators Hydrogen storage systems Wedge Series Connections Connections Investor Presentation Tenaris April 2022 8#9Rig DirectⓇ Services and Digital Integration Integrated solution that addresses costs, quality, operational efficiency and sustainability Active in 30 countries around the world 40+ service and distribution facilities 20+ years of experience in Rig Direct® Services Digital integration through Rig Direct® Portal, PipeTracer® and Digital Marketplace OneLineTM Services for complex pipeline projects Investor Presentation Tenaris April 2022 9#10Vertical integration in the US • • • ~USD10 billion invested in the US over the past 15 years. Largest US domestic producer complemented by imports from the rest of our industrial system. Vertical integration with domestic steel shop for local steel bar production. Serving many of the leading shale operators, e.g., ConocoPhillips, Diamondback Energy and Pioneer Natural Resources. Full product range supplemented with Rig Direct® Services and digital integration. Denver Bakersfield Oklahoma City Hickman Investor Presentation Midland Brookfield Ambridge Pittsburgh Koppel West Virginia Wilder Conroe Westwego Bay City Baytown Freeport Tenaris Manufacturing Centers Regional Comercial Offices ■ Service Centers Steel Shop April 2022 10 10#11Input Costs Evolution 300 280 260 240 220 200 180 160 140 120 100 8622 40 20 80 60 2014 avg 1Q15 2Q15 3Q15 4Q15 1Q16 2Q16 3Q16 4Q16 Spot Prices as of April 8th 2022 1Q17 2Q17 3Q17 4Q17 1Q18 2Q18 3Q18 4Q18 1Q19 2Q19 3Q19 4Q19 1Q20 Iron Ore (IODEX) Scrap USA (CRU) HRC USA (CRU) Structural increase in raw material, energy and freight costs reflecting post pandemic economic recovery, the Russia - Ukraine war and the energy transition. Investor Presentation Tenaris 2Q20 3Q20 4Q20 1Q21 2Q21 3Q21 4Q21 1Q22 Spot April 2022 11 1,582 US$/Tn 636 US$/Tn 155 US$/Tn#12Financial Performance USD million 1,800 1,600 1,400 1,200 1,000 800 600 400 200 EBITDA ה % 20% 15% 1,000 TIME 2017 2018 EBITDA 2019 2020 % EBITDA margin USD million Net cash position 1,200 1,000 800 ༔ ༔ ༔ ° 2021 25% USD million 1,500 Free cash flow % Sales 30% 25% 20% 15% 500 10% 10% 5% 0 5% 2017 2018 2019 2020 21 0% -5% -10% -1,000 -15% FCF Free cash flow margin (% sales) 0% -500 USD million 600 500 400 300 200 100 0 Dividend % yield 4.5% 4.0% 3.5% 3.0% 2.5% 2.0% 1.5% 1.0% 0.5% 0.0% 2020 2021 Proposed HM 2017 2018 2019 2017 2018 2019 2020 2021 Investor Presentation Tenaris I Dividend Yield (Dividend/Avg. Market Cap.) April 2022 12#13USD million 2,500 2,000 1,500 1,000 500 Quarterly Financial Performance Net Sales USD million 700 600 500 400 300 EBITDA % 30.0% 25.0% 20.0% 15.0% 10.0% ||| ..||| 200 100 1Q 2021 2Q 2021 5.0% 0.0% 3Q 2021 4Q 2021 1Q 2022 USD million 1Q 2021 2Q 2021 3Q 2021 4Q 2021 1Q 2022 Free cash flow 40 20 0 -20 -40 -60 -80 -100 -120 1Q 2021 2Q 2021 3Q 2021 4Q 2021 1Q 2022 Investor Presentation Tenaris EBITDA % EBITDA margin USD million Net cash position 1,200 1,000 800 600 400 200 Dec-21 Mar-22 Mar-21 Jun-21 Sep-21 April 2022 13#14Tenaris Investor Presentation Tenaris April 2022 14 14