Company: TNRSF
Filing Date: 2025-11-03
Form Type: 6-K
Source: 0001171843-25-006874
Chunk: 0

Company: TENARIS SA
Filing Date: 2025-11-03
Form: 6-K
Chunk 0
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<div align='center'>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</div>

As of November 2, 2025

<div align='center'>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 ___</div>

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 Press Release announcing Tenaris to Commence a USD 600 million Second Tranche of its USD 1.2 Billion Share Buyback Program.

<div align='center'>SIGNATURE</div>

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: November 2, 2025

<div align='center'>Tenaris, S.A.</div>

**By: /s/ Giovanni Sardagna

Giovanni Sardagna

Investor Relations Officer

Giovanni Sardagna

Tenaris

1-888-300-5432

www.tenaris.com

Tenaris to Commence a USD 600 million Second Tranche of its USD 1.2 Billion Share Buyback Program**

Luxembourg, November 2, 2025. - Tenaris S.A. (NYSE and Mexico: TS and EXM Italy: TEN) (“Tenaris”) announced today that pursuant to its USD 1.2 billion Share Buyback Program (the “Program”) announced on May 27, 2025, it has entered into a non-discretionary buyback agreement with a primary financial institution (the “Bank”) for the execution of its second tranche, covering up to the remainder USD 600 million of the Program (excluding customary transaction fees). This second tranche shall start on November 3, 2025, and end