Investor Presentation April 2022

USD 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

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