Tenaris S.A.

Transaction in Own Shares • Feb 8, 2025

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

Weekly Report (February 3, 2025 – February 7, 2025) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, February 7, 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 3, 2025 to (and including) February 7, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
03-feb-25	MTAA	531,200	18.3072	9,724,785	1.0315	10,031,115
03-feb-25	CEUX	313,400	18.3073	5,737,508	1.0315	5,918,239
03-feb-25	TQEX	38,000	18.2973	695,297	1.0315	717,199
03-feb-25	AQEU	36,400	18.2995	666,102	1.0315	687,084
04-feb-25	MTAA	200,000	18.4329	3,686,580	1.0382	3,827,407
05-feb-25	MTAA	200,000	18.4969	3,699,380	1.0419	3,854,384
06-feb-25	MTAA	100,000	18.6169	1,861,690	1.0368	1,930,200
07-feb-25	MTAA	500,000	18.4544	9,227,200	1.0344	9,544,616
		1,919,000	18.3942	35,298,542		36,510,245

From February 3, 2025 to (and including) February 7, 2025, the Company has purchased a total of 1,919,000 ordinary shares for a total consideration of €35,298,542, equivalent to USD36,510,245.

As of February 7, 2025, the Company held in treasury 85,676,212 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 7.37% 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.