Tenaris S.A.

Transaction in Own Shares • Jul 28, 2024

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

Weekly Report (July 22, 2024 – July 26, 2024) on the Fourth Tranche of Tenaris Share Buyback Program

Luxembourg, July 26, 2024. - Tenaris S.A. (NYSE and Mexico: TS and EXM Italy: TEN) ("Tenaris") announced today that pursuant to its Fourth Tranche of the Share Buyback Program announced on June 14, 2024, covering up to \$300 million to be executed in the open market, it has repurchased the following ordinary shares from July 22 to (and including) July 26, 2024:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
22-Jul-2024	MTAA	155,000	14.5646	2,257,513	1.0885	2,457,197
23-Jul-2024	MTAA	220,000	14.4614	3,181,508	1.0845	3,450,341
24-Jul-2024	MTAA	155,500	14.4169	2,241,828	1.0854	2,433,284
25-Jul-2024	MTAA	182,486	14.2285	2,596,502	1.0855	2,818,496
26-Jul-2024	MTAA	114,747	14.5058	1,664,497	1.0856	1,806,983
		827,733	14.4272	11,941,848		12,966,301

From July 22, 2024 to (and including) July 26, 2024, the Company has purchased a total of 827,733 ordinary shares for a total consideration of €11,941,848, equivalent to USD12,966,301.

As of July 26, 2024, the Company held in treasury 52,331,710 ordinary shares (including 16,367,003 ordinary shares bought in the second tranche and 18,080,524 ordinary shares bought in the third tranche), equal to 4.5% 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.