Tenaris S.A.

Transaction in Own Shares • Jun 8, 2024

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

Weekly Report (June 3, 2024 – June 7, 2024) on the Third Tranche of Tenaris Share Buyback Program

Luxembourg, June 7, 2024. - Tenaris S.A. (NYSE and Mexico: TS and EXM Italy: TEN) ("Tenaris") announced today that pursuant to its Third Tranche of the Share Buyback Program announced on May 12, 2024, covering up to \$300 million to be executed in the open market, it has repurchased the following ordinary shares from June 3 to (and including) June 7, 2024:

Date	Trading Venue	Shares Purchased	Weighted Average Price (EUR)	Purchases in EUR	Reference FX	Purchases in USD
03-Jun-2024	CEUX	296,000	15.1366	4,480,434	1.0869	4,869,769
03-Jun-2024	MTAA	635,000	15.1355	9,611,043	1.0869	10,446,269
03-Jun-2024	TQEX	48,000	15.1385	726,648	1.0869	789,791
04-Jun-2024	CEUX	303,000	14.8032	4,485,370	1.0880	4,880,095
04-Jun-2024	MTAA	657,000	14.8032	9,725,702	1.0880	10,581,539
04-Jun-2024	TQEX	49,000	14.8039	725,391	1.0880	789,228
05-Jun-2024	CEUX	319,000	14.8424	4,734,726	1.0865	5,144,284
05-Jun-2024	MTAA	678,900	14.8422	10,076,370	1.0865	10,947,974
05-Jun-2024	TQEX	52,000	14.8428	771,826	1.0865	838,591
06-Jun-2024	CEUX	322,000	14.8069	4,767,822	1.0878	5,186,423
06-Jun-2024	MTAA	676,000	14.8073	10,009,735	1.0878	10,888,611
06-Jun-2024	TQEX	54,000	14.8061	799,529	1.0878	869,728
07-Jun-2024	CEUX	324,000	14.9405	4,840,722	1.0812	5,233,803
07-Jun-2024	MTAA	677,000	14.9402	10,114,515	1.0812	10,935,791
07-Jun-2024	TQEX	56,000	14.9383	836,545	1.0812	904,473
		5,146,900	14.9034	76,706,376		83,306,370

From June 3, 2024 to (and including) June 7, 2024, the Company has purchased a total of 5,146,900 ordinary shares for a total consideration of €76,706,376, equivalent to USD83,306,370.

As of June 7, 2024, the Company held in treasury 31,478,880 ordinary shares (including 16,367,003 ordinary shares bought in the second tranche), equal to 2.71% 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.