Groep Tenaris S.A.

Part of Tenaris SA, Silcotub SA is a Romanian company that manufactures semi-fabricated and laminated steel products. The company is based in Zalau, Romania and was founded in 1977.

Siderca SAIC engages in operating integrated tubes mills. It produces seamless tubes and delivers a wide range of products for the energy market, the automotive sector, and for agro-industrial applications. The company was founded in 1954 and is headquartered in Buenos Aires, Argentina.

Tubos de Acero de México SA is a manufactures steel pipes. Its principal activities are the production of seamless steel pipe such as casing, tubing & drill pipe used in various phases of oil and gas production as well as transportation. It also manufactures weldable pipe fittings, cold-drawn pipe and other mechanical seamless pipes for industrial usage. Its activities include material selection, project management, double jointing, internal & external coating, internal blasting, anode pad installation, buckle arrestors and tight dimentsional tolerances achieved with internal diamenter machining or cold-end sizing. The company operates in the offshore markets of the Gulf of Mexico, West Africa, Far East, United Kingdom and Scandinavia. TenerisTamsa was founded in 1952 and is headquartered in Mexico City, Mexico.

Part of Tenaris SA, Tenaris Investments SARL is an investment holding Luxembourger company. The company is based in Luxembourg, Luxembourg.