Tenaris S.A.

Transaction in Own Shares • Jun 14, 2025

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

Weekly Report (June 9, 2025 – June 13, 2025) on the First Tranche of Tenaris Share Buyback Program.

Luxembourg, June 13, 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 June 9, 2025 to (and including) June 13, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
09-jun-25	MTAA	349,266	15.3519	5,361,897	1.1408	6,116,852
09-jun-25	CEUX	92,356	15.3490	1,417,572	1.1408	1,617,166
10-jun-25	MTAA	545,000	15.7016	8,557,372	1.1424	9,775,942
10-jun-25	CEUX	282,000	15.7009	4,427,654	1.1424	5,058,152
10-jun-25	TQEX	42,000	15.6812	658,610	1.1424	752,397
10-jun-25	AQEU	39,000	15.6801	611,524	1.1424	698,605
11-jun-25	MTAA	545,000	15.7285	8,572,033	1.1483	9,843,265
11-jun-25	CEUX	285,000	15.7281	4,482,509	1.1483	5,147,265
11-jun-25	TQEX	41,000	15.7372	645,225	1.1483	740,912
11-jun-25	AQEU	29,000	15.7370	456,373	1.1483	524,053
12-jun-25	MTAA	603,154	15.5879	9,401,904	1.1584	10,891,166
12-jun-25	CEUX	249,000	15.5877	3,881,337	1.1584	4,496,141
12-jun-25	TQEX	46,000	15.5888	717,085	1.1584	830,671
13-jun-25	MTAA	612,413	15.6315	9,572,934	1.1543	11,050,037
13-jun-25	CEUX	304,000	15.6322	4,752,189	1.1543	5,485,452
13-jun-25	TQEX	48,000	15.6302	750,250	1.1543	866,013
13-jun-25	AQEU	43,000	15.6318	672,167	1.1543	775,883
		4,155,189	15.6283	64,938,634		74,669,971

From June 9, 2025 to (and including) June 13, 2025, the Company has purchased a total of 4,155,189 ordinary shares for a total consideration of €64,938,634, equivalent to USD74,669,971.

As of June 13, 2025, the Company held in treasury 4,155,189 ordinary shares equal to 0.39% 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.