Tenaris S.A.

Transaction in Own Shares • Jan 31, 2025

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

Weekly Report (January 27, 2025 – January 31, 2025) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, January 31, 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 27, 2025 to (and including) January 31, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
27-ene-25	MTAA	308,758	18.5105	5,715,265	1.0498	5,999,885
27-ene-25	CEUX	101,520	18.4896	1,877,064	1.0498	1,970,542
27-ene-25	TQEX	20,300	18.4735	375,012	1.0498	393,688
28-ene-25	MTAA	380,323	18.3368	6,973,907	1.0424	7,269,600
29-ene-25	MTAA	379,954	18.0469	6,856,992	1.0420	7,144,985
29-ene-25	CEUX	306,200	18.0815	5,536,555	1.0420	5,769,091
29-ene-25	TQEX	36,700	18.0654	663,000	1.0420	690,846
29-ene-25	AQEU	35,100	18.0648	634,074	1.0420	660,706
30-ene-25	MTAA	250,000	18.2460	4,561,500	1.0430	4,757,645
31-ene-25	MTAA	303,655	18.3466	5,571,037	1.0395	5,791,093
31-ene-25	CEUX	270,000	18.3512	4,954,824	1.0395	5,150,540
		2,392,510	18.2734	43,719,231		45,598,620

From January 27, 2025 to (and including) January 31, 2025, the Company has purchased a total of 2,392,510 ordinary shares for a total consideration of €43,719,231, equivalent to USD45,598,620.

As of January 31, 2025, the Company held in treasury 83,757,212 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 7.20% 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.