Tenaris S.A.

Transaction in Own Shares • Feb 28, 2025

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

Weekly Report (February 24, 2025 – February 28, 2025) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, February 28, 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 24, 2025 to (and including) February 28, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
24-feb-25	MTAA	30,000	17.9581	538,743	1.0466	563,848
25-feb-25	MTAA	30,000	17.6470	529,410	1.0497	555,722
26-feb-25	MTAA	30,000	17.6958	530,874	1.0505	557,683
27-feb-25	MTAA	30,000	18.0965	542,895	1.0412	565,262
28-feb-25	MTAA	30,000	17.9955	539,865	1.0401	561,514
		150,000	17.8786	2,681,787		2,804,029

From February 24, 2025 to (and including) February 28, 2025, the Company has purchased a total of 150,000 ordinary shares for a total consideration of €2,681,787, equivalent to USD2,804,029.

As of February 28, 2025, the Company held in treasury 90,095,494 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 7.75% 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.