Company: TNRSF
Filing Date: 2025-12-01
Form Type: 6-K
Source: 0001171843-25-007659
Chunk: 0

Company: TENARIS SA
Filing Date: 2025-12-01
Form: 6-K
Chunk 0
---
<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 28, 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>

Indicate by check mark whether the registrant by furnishing the
information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12G3-2(b) under
the Securities Exchange Act of 1934.

<div align='center'>Yes ____ No Ö

If “Yes” is marked, indicate below
the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-__.</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 Weekly Report
(November 24, 2025 – November 28, 2025) on the Second Tranche of Tenaris 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 28, 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

Weekly Report (November 24, 2025 – November 28, 2025)
on the Second Tranche of Tenaris Share Buyback Program.

Luxembourg, November 28, 2025. - Tenaris S.A. (