Tenaris S.A.

Transaction in Own Shares • Jul 20, 2024

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

Weekly Report (July 15, 2024 – July 19, 2024) on the Fourth Tranche of Tenaris Share Buyback Program

Luxembourg, July 19, 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 15 to (and including) July 19, 2024:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
15-Jul-2024	MTAA	280,555	14.4347	4,049,727	1.0917	4,421,083
16-Jul-2024	MTAA	263,705	14.4211	3,802,916	1.0878	4,136,823
17-Jul-2024	MTAA	222,000	14.5380	3,227,436	1.0934	3,528,883
18-Jul-2024	MTAA	172,900	14.6045	2,525,118	1.0915	2,756,175
19-Jul-2024	MTAA	171,200	14.6491	2,507,926	1.0889	2,730,881
		1,110,360	14.5116	16,113,123		17,573,844

From July 15, 2024 to (and including) July 19, 2024, the Company has purchased a total of 1,110,360 ordinary shares for a total consideration of €16,113,123, equivalent to USD17,573,844.

As of July 19, 2024, the Company held in treasury 51,503,977 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 4.43% 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.