Tenaris S.A.

Transaction in Own Shares • Jan 3, 2025

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

Weekly Report (December 30, 2024 – January 3, 2025) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, January 3, 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 December 30, 2024 to (and including) January 3, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
30-dic-24	MTAA	331,448	18.0928	5,996,822	1.0380	6,224,702
30-dic-24	CEUX	171,979	18.0950	3,111,960	1.0380	3,230,214
02-ene-25	MTAA	50,000	18.3666	918,330	1.0281	944,135
03-ene-25	MTAA	300,000	18.3517	5,505,510	1.0287	5,663,518
		853,427	18.2003	15,532,622		16,062,569

From December 30, 2024 to (and including) January 3, 2025, the Company has purchased a total of 853,427 ordinary shares for a total consideration of €15,532,622, equivalent to USD16,062,569.

As of January 3, 2025, the Company held in treasury 78,835,337 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 6.78% 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.