NEW YORK, March 12, 2008 — The Bank of New York Mellon (NYSE: BK), a global leader in securities servicing, has been selected by Tenaris S.A. (Tenaris) as successor depositary bank for its American depositary receipt (ADR) program. Each Tenaris ADR represents two ordinary shares. The ADRs trade on the New York Stock Exchange under the symbol "TS." The ordinary shares trade on the Mercado de Valores de Buenos Aires under the symbol "TS," the Mercato Telematico Azionario under the symbol "TEN," and the Bolsa Mexicana de Valores, S.A. de C.V. under the symbol "TS."

Tenaris is a leading supplier of tubes and related services for the world's energy industry and certain other industrial applications. It has established an integrated global network of manufacturing, R&D, finishing and service facilities, with a direct presence in most major oil and gas markets worldwide. Since becoming a publicly listed company in December 2002 following a multi-jurisdictional exchange offer, Tenaris has grown rapidly and its market capitalization has increased more than tenfold.

"We are pleased to be serving as the new depositary for Tenaris, one of the largest and most active issuers in the DR universe," said Christopher Sturdy, executive vice president and head of The Bank of New York Mellon's Depositary Receipt Division. "When a highly experienced DR issuer like Tenaris appoints us as successor depositary bank, we believe it attests to our proven track record and commitment to the business. We look forward to putting our resources to work for Tenaris."

The Bank of New York Mellon's Depositary Receipt business is conducted through The Bank of New York subsidiary, which acts as depositary for more than 1,300 American and global depositary receipt programs, acting in partnership with leading companies from 63 countries. With an unrivalled commitment to helping securities issuers succeed in the world's rapidly evolving financial markets, the Company delivers the industry's most comprehensive suite of integrated depositary receipt, corporate trust and stock transfer services. Additional information is available at http://www.adrbny.com/.

The Bank of New York Mellon Corporation is a global financial services company focused on helping clients manage and service their financial assets, operating in 34 countries and serving more than 100 markets. The company is a leading provider of financial services for institutions, corporations and high net-worth individuals, providing superior asset management and wealth management, asset servicing, issuer services, clearing services and treasury services through a worldwide client-focused team. It has more than $23 trillion in assets under custody and administration, more than $1.1 trillion in assets under management and services $11 trillion in outstanding debt. Additional information is available at bnymellon.com.

This release is for informational purposes only. The Bank of New York Mellon provides no advice nor recommendation or endorsement with respect to any company or securities. Nothing herein shall be deemed to constitute an offer to sell or a solicitation of an offer to buy securities. Depositary Receipts: Not FDIC, State or Federal Agency Insured; May Lose Value; No Bank, State or Federal Agency Guarantee.