Tenaris S.A.

Transaction in Own Shares • Dec 27, 2024

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

Weekly Report (December 23, 2024 – December 27, 2024) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, December 27, 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 23, 2024 to (and including) December 27, 2024:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
23-Dec-24	MTAA	233,597	17.9189	4,185,801	1.0391	4,349,466
27-Dec-24	MTAA	331,607	18.1377	6,014,588	1.0423	6,269,005
		565,204	18.0473	10,200,390		10,618,471

From December 23, 2024 to (and including) December 27, 2024, the Company has purchased a total of 565,204 ordinary shares for a total consideration of €10,200,390, equivalent to USD10,618,471.

As of December 27, 2024, the Company held in treasury 77,981,910 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 6.71% 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.