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

As of June 9, 2016

TENARIS, S.A.

(Translation of Registrant's name into English)

TENARIS, S.A.

29, Avenue de la Porte-Neuve 3rd floor

L-2227 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-FÖForm 40-F

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.

Yes NoÖ

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-.

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 subscribes to additional shares in Usiminas capital increase.

SIGNATURE

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 9, 2016.

Tenaris, S.A.

By: /s/ Cecilia Bilesio

Cecilia Bilesio

Corporate Secretary

Giovanni Sardagna

Tenaris

1-888-300-5432

www.tenaris.com

Tenaris subscribes to additional shares in Usiminas capital increase

Luxembourg, June 9, 2016 – Tenaris S.A. (NYSE, Buenos Aires and Mexico: TS and MTA Italy: TEN) announced today, in connection with the previously-announced issuance of 200 million ordinary shares of Usinas Siderúrgicas de Minas Gerais – Usiminas at BRL 5.0 per share, that all entities within the Ternium/Tenaris Group (including TenarisConfab) have exercised their rights to subscribe to their corresponding portion of the shares left unsubscribed in the initial subscription round.

Today, TenarisConfab subscribed to 4.2 million ordinary shares for a total amount of BRL 20.9 million (approximately USD 6.2 million), and also indicated its willingness to subscribe to ordinary shares that remain unsubscribed following the completion of this second subscription round (if any).

Taking into consideration the ordinary shares subscribed to in the first round on May 23, 2016, TenarisConfab subscribed to 9.3 million ordinary shares for a total amount of BRL 46.2 million (approximately USD 13.4 million).

Some of the statements contained in this press release are "forward-looking statements". Forward-looking statements are based on management's current views and assumptions and involve known and unknown risks that could cause actual results, performance or events to differ materially from those expressed or implied by those statements.

Tenaris is a leading global supplier of steel tubes and related services for the world's energy industry and certain other industrial applications.