Tenaris S.A.

Transaction in Own Shares • Nov 16, 2024

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

Weekly Report (November 11, 2024 – November 15, 2024) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, November 15, 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 November 11, 2024 to (and including) November 15, 2024:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX Purchases in	USD
11-nov-24	MTAA	400,000	17.5441	7,017,640	1.0643	7,468,874
12-nov-24	MTAA	50,000	17.5119	875,595	1.0611	929,094
13-nov-24	MTAA	50,000	17.2787	863,935	1.0590	914,907
14-nov-24	MTAA	50,000	17.4539	872,695	1.0576	922,962
15-nov-24	MTAA	50,000	17.6269	881,345	1.0534	928,409
		600,000	17.5187	10,511,210		11,164,246

From November 11, 2024 to (and including) November,15 2024, the Company has purchased a total of 600,000 ordinary shares for a total consideration of €10,511,210, equivalent to USD11,164,246.

As of November 15, 2024, the Company held in treasury 54,500,466 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 4.69% 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.