NOS, SGPS, S.A. provides cable and satellite television, and voice and Internet access services primarily in Portugal. The company operates through Telco and Audiovisuals segments. It is involved in the provision of electronic communication services, including data and multimedia communication services; voice over IP services, mobile virtual network operator services, and related consultancy services; and cable and satellite television distribution activities. The company also produces and distributes films and series channels; and manages the advertising space on Pay TV channels and in the cinemas. In addition, it is involved in the production and sale of videos; cinema exhibition and distribution business; and the acquisition/negotiation of Pay TV and video-on-demand rights. Further, the company imports, distributes, commercializes, and produces audiovisual products; and designs, constructs, manages, and exploits electronic communications networks and their equipment and infrastructure, as well as manages technologic assets and renders related services. Additionally, it is involved in the implementation, installation, and operation of towers and other sites for the placement of telecommunications equipment; management of real estate; commercialization of public events and cable TV contents; purchase, sale, renting, and operation of property and commercial establishments; realization of urbanization and building construction; investment management; and provision of publicity services. The company was formerly known as ZON Optimus, SGPS, S.A. and changed its name to NOS, SGPS, S.A. in June 2014. The company was founded in 1999 and is headquartered in Lisbon, Portugal. NOS, SGPS, S.A. operates as a subsidiary of Zopt SGPS SA.