Tenaris S.A.

Transaction in Own Shares • Sep 30, 2025

Informazione Regolamentata n. 0602-38-2025		Data/Ora Inizio Diffusione 30 Settembre 2025 23:54:01	Euronext Milan
Societa'	:	TENARIS
Identificativo Informazione Regolamentata	:	210539
Utenza - referente	:	TENARISN02 - Sardagna Giovanni
Tipologia	:	2.4
Data/Ora Ricezione	:	30 Settembre 2025 23:54:01
Data/Ora Inizio Diffusione	:	30 Settembre 2025 23:54:01
Oggetto	:	Weekly Report (September 29, 2025 – September 30, 2025) on the First Tranche of Tenaris Share Buyback Program.
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Giovanni Sardagna Tenaris 1-888-300-5432 www.tenaris.com

Weekly Report (September 29, 2025 – September 30, 2025) on the First Tranche of Tenaris Share Buyback Program.

Luxembourg, September 30, 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 USD600 million to be executed in the open market, it has repurchased the following ordinary shares from September 29, 2025 to (and including) September 30, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference F X	Purchases in USD
29-sep-25	MTAA	51,338	15.2592	783,377	1.1732	919,058
29-sep-25	CEUX	29,550	15.2397	450,333	1.1732	528,331
29-sep-25	TQEX	13,258	15.2572	202,280	1.1732	237,315
29-sep-25	AQEU	5,983	15.2624	91,315	1.1732	107,131
30-sep-25	MTAA	245,966	15.2465	3,750,121	1.1750	4,406,392
30-sep-25	CEUX	184,276	15.2540	2,810,946	1.1750	3,302,862
30-sep-25	TQEX	69,000	15.2782	1,054,196	1.1750	1,238,680
30-sep-25	AQEU	58,713	15.2565	895,755	1.1750	1,052,512
		658,084	15.2539	10,038,322		11,792,279

From September 29, 2025 to (and including) September 30, 2025, the Company has purchased a total of 658,084 ordinary shares for a total consideration of €10,038,322, equivalent to USD11,792,279.

As of September 30, 2025, the Company held in treasury 33,059,955 ordinary shares equal to 3.08% 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.