Company: TNRSF
Filing Date: 2025-05-28
Form Type: 6-K
Source: 0001171843-25-003473
Chunk: 0

Company: TENARIS SA
Filing Date: 2025-05-28
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 May 27, 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 Share buyback program of up to USD 1.2 billion.

<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: May 27, 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

Share buyback program of up to USD 1.2 billion

Luxembourg, May 27, 2025. - Tenaris S.A. (NYSE and Mexico: TS and
EXM Italy: TEN) (“Tenaris”) announced today that Tenaris’s Board of Directors approved a share buyback program of up
to $1.2 billion (which, at the closing price of May 27, 2025 on the Milan Stock Exchange would represent approximately 74 million shares,
or 6.9% of Tenaris’s outstanding shares), to be executed within a year, with the intention to cancel the ordinary shares acquired
through the program.

The decision and opportunity of initiating the buyback program is driven
by the company’s significant cash flow generation and strong balance sheet.

The buyback program will