Tenaris S.A.

Transaction in Own Shares • Dec 5, 2025

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Data/Ora Ricezione : 5 Dicembre 2025 23:41:01

Oggetto : Weekly Report (December 1, 2025 – December

5, 2025) on the Second Tranche of Tenaris

Share Buyback Program.

Testo del comunicato

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

Weekly Report (December 1, 2025 – December 5, 2025) on the Second Tranche of Tenaris Share Buyback Program.

Luxembourg, December 5, 2025. - Tenaris S.A. (NYSE and Mexico: TS and EXM Italy: TEN) ("Tenaris") announced today that pursuant to its Second Tranche of the USD1.2 billion Share Buyback Program announced on November 2, 2025, covering up to USD600 million to be executed in the open market, it has repurchased the following ordinary shares from December 1, 2025 to (and including) December 5, 2025:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
01-dic-25	MTA	451,432	17.5058	7,902,678	1.1606	9,171,453
01-dic-25	CEUX	326,347	17.5062	5,713,096	1.1606	6,630,333
01-dic-25	TQEX	46,377	17.5047	811,815	1.1606	942,152
01-dic-25	AQXE	39,006	17.5040	682,761	1.1606	792,378
02-dic-25	MTA	454,074	17.1727	7,797,677	1.1630	9,068,698
02-dic-25	CEUX	325,781	17.1747	5,595,191	1.1630	6,507,207
02-dic-25	TQEX	45,885	17.1762	788,130	1.1630	916,595
02-dic-25	AQXE	39,565	17.1765	679,588	1.1630	790,361
03-dic-25	MTA	472,124	17.4363	8,232,096	1.1607	9,554,582
03-dic-25	CEUX	257,933	17.3984	4,487,622	1.1607	5,208,558
03-dic-25	TQEX	46,392	17.4350	808,845	1.1607	938,785
03-dic-25	AQXE	40,346	17.4345	703,412	1.1607	816,416
04-dic-25	MTA	482,740	17.6296	8,510,513	1.1662	9,924,535
04-dic-25	CEUX	344,796	17.6307	6,078,995	1.1662	7,089,020
04-dic-25	TQEX	46,786	17.6306	824,865	1.1662	961,917
04-dic-25	AQXE	41,372	17.6300	729,388	1.1662	850,576
05-dic-25	MTA	490,864	17.7262	8,701,153	1.1674	10,157,291
05-dic-25	CEUX	348,017	17.7268	6,169,228	1.1674	7,201,648
05-dic-25	TQEX	46,918	17.7278	831,753	1.1674	970,947
05-dic-25	AQXE	42,446	17.7280	752,483	1.1674	878,411
		4,389,201	17.4978	76,801,289		89,371,864

From December 1, 2025 to (and including) December 5, 2025, the Company has purchased a total of 4,389,201 ordinary shares for a total consideration of €76,801,289, equivalent to USD89,371,864.

As of December 5, 2025, the Company held in treasury 46,339,274, ordinary shares equal to 4.32% 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.