Semapa - Sociedade de Investimento e Gestão (English: Semapa - Investment and Management Company) is a Portuguese conglomerate holding company with interests in the cement, pulp and paper and environmental services sectors.

The company owns 76.7% of The Navigator Company, previously known as Portucel Soporcel, Europe's largest producer of bleached eucalyptus kraft pulp.

[4] It also holds 51% of Secil Group [pt], a manufacturer of cement and its derivatives; and 100% of ETSA, a waste management firm involved in the collection, storage and treatment of animal by-products.

The company is listed on Euronext Lisbon stock exchange and is a constituent of the PSI 20 index.

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