Tenaris S.A.

Transaction in Own Shares • Mar 15, 2024

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

Weekly Report (March 11, 2024 - March 15, 2024) on the Second Tranche of Tenaris Share Buyback Program

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

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
11-mar-24	MTAA	485,287	17.2438	8,368,192	1.0927	9,143,923
12-mar-24	MTAA	199,616	17.5437	3,502,003	1.0917	3,823,137
13-mar-24	MTAA	30,000	17.7366	532,098	1.0943	582,275
14-mar-24	MTAA	30,000	17.9032	537,096	1.0887	584,736
15-mar-24	MTAA	29,623	17.8198	527,876	1.0887	574,699
		774,526	17.3878	13,467,265		14,708,770

From March 11, 2024 to (and including) March 15, 2024, the Company has purchased a total of 774,526 ordinary shares for a total consideration of €13,467,265, equivalent to USD14,708,770.

As of March 15, 2024, the Company held in treasury 29,651,982 ordinary shares (including 17,779,302 ordinary shares bought in the first tranche), equal to 2.51% 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.