Company: TNRSF
Filing Date: 2025-06-20
Form Type: 6-K
Source: 0001171843-25-003969
Chunk: 0

Company: TENARIS SA
Filing Date: 2025-06-20
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 June 18, 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 provides information pursuant to Luxembourg Transparency Law.

<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 18, 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 provides information pursuant to Luxembourg Transparency Law

Luxembourg, June 18, 2025. - Tenaris S.A. (NYSE and Mexico: TS and
EXM Italy: TEN) (“Tenaris”, or the “Company”) announced today that the Company’s controlling shareholder,
San Faustin S.A. (“San Faustin”), has notified the Company that, as a result of Tenaris’s open market repurchases of
own shares under its share buyback program publicly announced on May 27, 2025, San Faustin has passively crossed a voting rights
threshold triggering a notice requirement under the Luxembourg Transparency Law.

On the date hereof, San Faustin informed the Company that, following repurchases
of shares by Tenaris in the period from June 9 to June 13, 2025 (disclosed