Investor Presentation April 2022

Input 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

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