Tenaris S.A.

Transaction in Own Shares • Jan 17, 2025

Giovanni Sardagna Tenaris 1-888-300-5432 www.tenaris.com

Weekly Report (January 13, 2025 – January 17, 2025) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, January 17, 2025. - Tenaris S.A. (NYSE and Mexico: TS and EXM Italy: TEN) ("Tenaris") announced today that pursuant to its up to USD 700 million Share Buyback Program announced on November 10, 2024, (subject to a maximum of 46,373,915 ordinary shares), to be executed in the open market, it has repurchased the following ordinary shares from January 13, 2025 to (and including) January 17, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
13-ene-25	MTAA	50,000	19.0120	950,600	1.0199	969,517
14-ene-25	MTAA	50,000	19.0018	950,090	1.0293	977,928
15-ene-25	MTAA	50,000	19.0190	950,950	1.0304	979,859
16-ene-25	MTAA	394,921	19.0238	7,512,898	1.0299	7,737,534
17-ene-25	MTAA	300,000	19.0128	5,703,840	1.0301	5,875,526
		844,921	19.0176	16,068,378		16,540,363

From January 13, 2025 to (and including) January 17, 2025, the Company has purchased a total of 844,921 ordinary shares for a total consideration of €16,068,378, equivalent to USD16,540,363.

As of January 17, 2025, the Company held in treasury 80,425,814 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 6.92% of the total issued share capital.

Tenaris intends to cancel treasury shares purchased under the Programs in due course.

Details of the above transactions, are available on Tenaris's corporate website under the Share Buyback Program Section https://ir.tenaris.com/share-buyback-program.

Some of the statements contained in this press release are "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 risks include but are not limited to risks arising from uncertainties as to future oil and gas prices and their impact on investment programs by oil and gas companies.

Tenaris is a leading global supplier of steel tubes and related services for the world's energy industry and certain other industrial applications.