Tenaris S.A.

Transaction in Own Shares • Jan 25, 2025

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

Weekly Report (January 20, 2025 – January 24, 2025) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, January 24, 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 January 20, 2025 to (and including) January 24, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
20-ene-25	MTAA	100,000	19.0643	1,906,430	1.0401	1,982,878
21-ene-25	MTAA	149,360	18.9769	2,834,390	1.0399	2,947,482
22-ene-25	MTAA	100,000	18.8271	1,882,710	1.0419	1,961,596
23-ene-25	MTAA	100,000	18.7529	1,875,290	1.0396	1,949,458
24-ene-25	MTAA	489,528	18.3992	9,006,924	1.0517	9,472,582
		938,888	18.6452	17,505,743		18,313,995

From January 20, 2025 to (and including) January 24, 2025, the Company has purchased a total of 938,888 ordinary shares for a total consideration of €17,505,743, equivalent to USD18,313,995.

As of January 24, 2025, the Company held in treasury 81,364,702 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 7.00% 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.