Tenaris S.A.

Transaction in Own Shares • Jan 11, 2025

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

Weekly Report (January 6, 2025 – January 10, 2025) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, January 10, 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 6, 2025 to (and including) January 10, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
06-ene-25	MTAA	200,000	18.3102	3,662,040	1.0392	3,805,592
06-ene-25	CEUX	95,556	18.2858	1,747,318	1.0392	1,815,813
07-ene-25	MTAA	300,000	18.4386	5,531,580	1.0369	5,735,695
08-ene-25	MTAA	50,000	18.9134	945,670	1.0300	974,040
09-ene-25	MTAA	50,000	18.9032	945,160	1.0299	973,420
10-ene-25	MTAA	50,000	19.0360	951,800	1.0250	975,595
		745,556	18.4876	13,783,568		14,280,155

From January 6, 2025 to (and including) January 10, 2025, the Company has purchased a total of 745,556 ordinary shares for a total consideration of €13,783,568 , equivalent to USD14,280,155.

As of January 10, 2025, the Company held in treasury 79,580,893 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 6.84% 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.