Tenaris S.A.

Transaction in Own Shares • Apr 13, 2024

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

Weekly Report (April 8, 2024 – April 12, 2024) on the Second Tranche of Tenaris Share Buyback Program

Luxembourg, April 12, 2024. - Tenaris S.A. (NYSE and Mexico: TS and EXM Italy: TEN) ("Tenaris") announced today that pursuant to its Second Tranche of the Share Buyback Program announced on February 25, 2024, covering up to \$300 million to be executed in the open market, it has repurchased the following ordinary shares from April 8 to (and including) April 12, 2024:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
08-abr-24	MTAA	9,998	18.5429	185,392	1.0853	201,206
09-abr-24	MTAA	10,000	18.5232	185,232	1.0858	201,125
10-abr-24	MTAA	9,757	18.4641	180,154	1.0752	193,702
11-abr-24	MTAA	10,000	18.4755	184,755	1.0703	197,743
12-abr-24	MTAA	9,988	18.4470	184,249	1.0631	195,875
		49,743	18.4907	919,782		989,651

From April 8, 2024 to (and including) April 12, 2024, the Company has purchased a total of 49,743 ordinary shares for a total consideration of €919,782, equivalent to USD989,651.

As of April 12, 2024, the Company held in treasury 29,905,895 ordinary shares (including 17,779,302 ordinary shares bought in the first tranche), equal to 2.53% of the total issued share capital.

Tenaris intends to cancel all shares purchased under the Program 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.