Altri SGPS SA is a Portuguese industrial conglomerate headquartered in

Porto Porto (), also known in English language, English as Oporto, is the List of cities in Portugal, second largest city in Portugal, after Lisbon. It is the capital of the Porto District and one of the Iberian Peninsula's major urban areas. Porto c ...

. The group's main companies operate in

wood pulp Pulp is a fibrous Lignocellulosic biomass, lignocellulosic material prepared by chemically, semi-chemically, or mechanically isolating the cellulose fiber, cellulosic fibers of wood, fiber crops, Paper recycling, waste paper, or cotton paper, rag ...

production, cultivation of

forest A forest is an ecosystem characterized by a dense ecological community, community of trees. Hundreds of definitions of forest are used throughout the world, incorporating factors such as tree density, tree height, land use, legal standing, ...

s for the

timber Lumber is wood that has been processed into uniform and useful sizes (dimensional lumber), including beams and planks or boards. Lumber is mainly used for construction framing, as well as finishing (floors, wall panels, window frames). ...

and

paper industry The pulp and paper industry comprises companies that use wood, specifically pulpwood, as raw material and produce pulp, paper, paperboard, and other cellulose-based products. Manufacturing process In the manufacturing process, pulp is intro ...

and co-generation of

energy Energy () is the physical quantity, quantitative physical property, property that is transferred to a physical body, body or to a physical system, recognizable in the performance of Work (thermodynamics), work and in the form of heat and l ...

, including energy production from renewable resources. Prior to 2008 the group also operated in the

steelworks A steel mill or steelworks is an industrial plant for the manufacture of steel. It may be an integrated steel works carrying out all steps of steelmaking from smelting iron ore to rolled product, but may also be a plant where steel semi-fini ...

industry. Altri's holding company is Altri SGPS, SA., which is listed on the

Euronext Lisbon Euronext Lisbon is a stock exchange in Lisbon, Portugal. It is part of Euronext pan-European exchange. The most famous index is PSI-20. Euronext Lisbon trades equities, public and private bonds, participation bonds, warrants, corporate warrant ...

stock exchange A stock exchange, securities exchange, or bourse is an exchange where stockbrokers and traders can buy and sell securities, such as shares of stock, bonds and other financial instruments. Stock exchanges may also provide facilities for ...

. Its major subsidiaries are Celulose do Caima (paper industry) and Celbi (paper industry). Altri's F. Ramada subsidiary, which produced steel and storage systems such as cold rolled steel sheets and strips, machinery, tools and other related products, was spun off on the stock exchange in 2008. Altri was itself born from a spin-out of the industrial assets of the Cofina group in March 2005.

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* Conglomerate companies of Portugal Companies based in Porto Conglomerate companies established in 2005 Pulp and paper companies of Portugal Companies listed on Euronext Lisbon Companies in the PSI-20 {{Portugal-stub