Tenaris Comments on Recent Developments in Venezuela

LUXEMBOURG -- (MARKET WIRE) -- 05/22/09 -- Tenaris S.A. (NYSE: TS) (BAE: TS) (MXSE: TS) (MILAN: TEN) ("Tenaris") announced today that Venezuela's President Hugo Chavez has announced the decision to nationalize its majority-owned subsidiaries Tavsa, Tubos de Acero de Venezuela S.A. and Matesi, Materiales Siderurgicos S.A. and its minority interest in Complejo Siderurgico de Guayana, C.A. No details have been provided regarding the expropriation process. Tenaris is a leading global supplier of steel tubes and related services for the world's energy industry and certain other industrial applications. Contact: Giovanni Sardagna Tenaris 1-888-300-5432 www.tenaris.com This announcement was originally distributed by Hugin. The issuer is solely responsible for the content of this announcement.