Tenaris S.A.

Transaction in Own Shares • Dec 14, 2024

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

Weekly Report (December 9, 2024 – December 13, 2024) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, December 13, 2024. - 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 9, 2024 to (and including) December 13, 2024:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
09-dic-24	MTAA	200,000	18.5063	3,701,260	1.0590	3,919,634
10-dic-24	MTAA	200,000	18.5020	3,700,400	1.0502	3,886,160
11-dic-24	MTAA	200,000	18.4558	3,691,160	1.0489	3,871,658
12-dic-24	MTAA	200,000	18.5445	3,708,900	1.0472	3,883,960
13-dic-24	MTAA	300,000	18.4517	5,535,510	1.0487	5,805,089
		1,100,000	18.4884	20,337,230		21,366,502

From December 9, 2024 to (and including) December 13, 2024, the Company has purchased a total of 1,100,000 ordinary shares for a total consideration of €20,337,230, equivalent to USD21,366,502.

As of December 13, 2024, the Company held in treasury 73,783,869 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 6.35% 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.