Tenaris S.A.

Transaction in Own Shares • Aug 1, 2025

Informazione Regolamentata n. 0602-28-2025		Data/Ora Inizio Diffusione 1 Agosto 2025 23:42:53	Euronext Milan
	:
Societa'		TENARIS
Identificativo Informazione Regolamentata	:	208787
Utenza - referente	:	TENARISN02 - Sardagna Giovanni
Tipologia	:	2.4
Data/Ora Ricezione	:	1 Agosto 2025 23:42:53
Data/Ora Inizio Diffusione	:	1 Agosto 2025 23:42:53
Oggetto	:	Weekly Report (July 28, 2025 – August 1, 2025) on the First Tranche of Tenaris Share Buyback Program.
Testo del comunicato

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

Weekly Report (July 28, 2025 – August 1, 2025) on the First Tranche of Tenaris Share Buyback Program.

Luxembourg, August 1, 2025. - Tenaris S.A. (NYSE and Mexico: TS and EXM Italy: TEN) ("Tenaris") announced today that pursuant to its First Tranche of the USD1.2 billion Share Buyback Program announced on June 6, 2025, covering up to USD 600 million to be executed in the open market, it has repurchased the following ordinary shares from July 28, 2025 to (and including) August 1, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference F X	Purchases in USD
28-Jul-25	MTAA	49,582	16.3933	812,813	1.1637	945,870
29-Jul-25	MTAA	50,000	16.4638	823,190	1.1525	948,726
30-Jul-25	MTAA	188,570	16.4498	3,101,939	1.1479	3,560,716
30-Jul-25	CEUX	100,000	16.4524	1,645,240	1.1479	1,888,571
31-Jul-25	MTAA	345,000	15.6637	5,403,977	1.1446	6,185,392
31-Jul-25	CEUX	207,159	15.6714	3,246,472	1.1446	3,715,911
31-Jul-25	TQEX	35,951	15.6465	562,507	1.1446	643,846
31-Jul-25	AQEU	25,000	15.6395	390,988	1.1446	447,524
1-Aug-25	MTAA	392,000	15.1796	5,950,403	1.1557	6,876,881
1-Aug-25	CEUX	232,000	15.1810	3,521,992	1.1557	4,070,366
1-Aug-25	TQEX	40,000	15.1976	607,904	1.1557	702,555
1-Aug-25	AQEU	27,000	15.1701	409,593	1.1557	473,366
		1,692,262	15.6459	26,477,016		30,459,724

From July 28, 2025 to (and including) August 1, 2025, the Company has purchased a total of 1,692,262 ordinary shares for a total consideration of €26,477,016, equivalent to USD30,459,724.

As of August 1, 2025, the Company held in treasury 22,720,565 ordinary shares equal to 2.12% 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.