Tenaris (TNRSF) buys back 5.3M shares under USD1.2B program

Rhea-AI Filing Summary

Tenaris S.A. reported weekly activity for the second tranche of its USD1.2 billion share buyback program, which contemplates up to USD600 million to be executed in the open market. From December 15, 2025 to (and including) December 19, 2025, the company repurchased 5,336,993 ordinary shares for a total consideration of €89,794,646, equivalent to USD105,511,681.

As of December 19, 2025, Tenaris held 56,599,414 ordinary shares in treasury, representing 5.28% of its total issued share capital, and it intends to cancel the treasury shares purchased under its buyback programs in due course. The company has made detailed transaction information available on its website and notes that its outlook is subject to risks including uncertainty in future oil and gas prices and related investment spending.

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Form 6-K: How Foreign Companies Report to the SEC →

FORM 6 - K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Private Issuer

Pursuant to Rule 13a - 16 or 15d - 16 of

the Securities Exchange Act of 1934

As of December 19, 2025

TENARIS, S.A.

(Translation of Registrant's name into English)

26, Boulevard Royal, 4th floor

L-2449 Luxembourg

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or 40-F.

Form 20-F Ö Form 40-F ___

The attached material is being furnished to the Securities and Exchange Commission pursuant to Rule 13a-16 and Form 6-K under the Securities Exchange Act of 1934, as amended. This report contains Tenaris’s Weekly Report (December 15, 2025 – December 19, 2025) on the Second Tranche of Tenaris Share Buyback Program.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: December 19, 2025

Tenaris, S.A.

By: /s/ Giovanni Sardagna

Giovanni Sardagna

Investor Relations Officer

Giovanni Sardagna

Tenaris

1-888-300-5432

www.tenaris.com

Weekly Report (December 15, 2025 – December 19, 2025) on the Second Tranche of Tenaris Share Buyback Program.

Luxembourg, December 19, 2025. - Tenaris S.A. (NYSE and Mexico: TS and EXM Italy: TEN) (“Tenaris”) announced today that pursuant to its Second Tranche of the USD1.2 billion Share Buyback Program announced on November 2, 2025, covering up to USD600 million to be executed in the open market, it has repurchased the following ordinary shares from December 15, 2025 to (and including) December 19, 2025:

From December 15, 2025 to (and including) December 19, 2025, the Company has purchased a total of 5,336,993 ordinary shares for a total consideration of €89,794,646 equivalent to USD105,511,681.

As of December 19, 2025, the Company held in treasury 56,599,414 ordinary shares equal to 5.28% of the total issued share capital.

Tenaris intends to cancel treasury shares purchased under the Programs 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.

FAQ

What did Tenaris (TNRSF) disclose in its latest Form 6-K?

Tenaris disclosed a weekly update on the second tranche of its USD1.2 billion share buyback program, summarizing repurchases made between December 15 and 19, 2025 and its current treasury share position.

How many Tenaris (TNRSF) shares were repurchased in the December 15–19, 2025 period?

Between December 15 and 19, 2025, Tenaris repurchased 5,336,993 ordinary shares under the second tranche of its buyback program.

What was the total amount paid by Tenaris (TNRSF) for the weekly share repurchases?

For this weekly period, Tenaris paid a total consideration of €89,794,646, equivalent to USD105,511,681, for the repurchased ordinary shares.

What portion of its share capital does Tenaris (TNRSF) currently hold in treasury?

As of December 19, 2025, Tenaris held 56,599,414 ordinary shares in treasury, representing 5.28% of its total issued share capital.

What are the overall size and second tranche limits of Tenaris’s share buyback program?

Tenaris’s share buyback program totals USD1.2 billion, with the second tranche covering up to USD600 million to be executed in the open market.

What does Tenaris (TNRSF) plan to do with the treasury shares it is repurchasing?

Tenaris stated that it intends to cancel the treasury shares purchased under its buyback programs in due course.

Where can investors find detailed information on Tenaris’s recent buyback transactions?

Details of the transactions are available on Tenaris’s corporate website under the Share Buyback Program section at https://ir.tenaris.com/share-buyback-program.