Tenaris S.A.

Transaction in Own Shares • Feb 14, 2025

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

Weekly Report (February 10, 2025 – February 14, 2025) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, February 14, 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 February 10, 2025 to (and including) February 14, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
10-feb-25	MTAA	50,000	18.9397	946,985	1.0314	976,720
11-feb-25	MTAA	50,000	19.1353	956,765	1.0340	989,295
12-feb-25	MTAA	50,000	18.9904	949,520	1.0373	984,937
13-feb-25	MTAA	516,000	18.6239	9,609,932	1.0434	10,027,003
13-feb-25	CEUX	249,000	18.6308	4,639,069	1.0434	4,840,405
13-feb-25	TQEX	35,000	18.6340	652,190	1.0434	680,495
14-feb-25	MTAA	519,000	18.5250	9,614,475	1.0511	10,105,775
14-feb-25	CEUX	317,000	18.5212	5,871,220	1.0511	6,171,240
14-feb-25	TQEX	42,000	18.5287	778,205	1.0511	817,972
14-feb-25	AQEU	37,000	18.5348	685,788	1.0511	720,831
		1,865,000	18.6081	34,704,150		36,314,673

From February 10, 2025 to (and including) February 14, 2025, the Company has purchased a total of 1,865,000 ordinary shares for a total consideration of €34,704,150, equivalent to USD36,314,673.

As of February 14, 2025, the Company held in treasury 87,541,212 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 7.53% 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.