Tenaris S.A.

Transaction in Own Shares • Dec 7, 2024

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

Weekly Report (December 2, 2024 – December 6, 2024) on the USD 700 million Tenaris Share Buyback Program.

Luxembourg, December 6, 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 2, 2024 to (and including) December 6, 2024:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
02-dic-24	MTAA	973,048	18.2607	17,768,538	1.0468	18,600,105
02-dic-24	CEUX	498,000	18.2602	9,093,580	1.0468	9,519,159
02-dic-24	TQEX	89,758	18.2570	1,638,712	1.0468	1,715,404
02-dic-24	AQEU	72,000	18.2580	1,314,576	1.0468	1,376,098
03-dic-24	MTAA	968,798	18.3742	17,800,888	1.0517	18,721,194
03-dic-24	CEUX	499,000	18.3742	9,168,726	1.0517	9,642,749
03-dic-24	TQEX	89,000	18.3745	1,635,331	1.0517	1,719,877
03-dic-24	AQEU	71,525	18.3756	1,314,315	1.0517	1,382,265
04-dic-24	MTAA	400,000	18.4799	7,391,960	1.0530	7,783,364
05-dic-24	MTAA	604,541	18.4437	11,149,973	1.0573	11,788,866
06-dic-24	MTAA	200,000	18.2142	3,642,840	1.0565	3,848,478
		4,465,670	18.3443	81,919,437		86,097,560

From December 2, 2024 to (and including) December 6, 2024, the Company has purchased a total of 4,465,670 ordinary shares for a total consideration of €81,919,437, equivalent to USD86,097,560.

As of December 6, 2024, the Company held in treasury 72,683,869 ordinary shares (including 53,900,466 ordinary shares bought pursuant to the USD 1.2 billion Share Buyback Program), equal to 6.25% 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.