Company: TNRSF
Filing Date: 2025-06-09
Form Type: 6-K
Source: 0001171843-25-003775
Chunk: 0

Company: TENARIS SA
Filing Date: 2025-06-09
Form: 6-K
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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 June 6, 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 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 First 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: June 6, 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 First Tranche of its USD 1.2 Billion Share Buyback Program

Luxembourg, June 6, 2025. - Tenaris S.A. (NYSE and Mexico: TS and
EXM Italy: TEN) (“Tenaris”) announced today that pursuant to its Share Buyback Program (the “Program”) announced
on May 27, 2025, covering up to USD 1.2 billion, it has entered into a non-discretionary buyback agreement with a primary financial institution
(the “Bank”).

The Bank will make its trading decisions concerning the timing of the purchases
of Tenaris’s ordinary shares independently of and uninfluenced by Tenaris. The Program will be