Guillermo José Fernández Vidal

Yell Publicidad SA publishes and distributes directories. It publishes the Spanish telephone directores Páginas Amarillas & Páginas Blancas, besides operating the online Spanish yellow pages (PaginasAmarillas.es) and white pages (PaginasBlancas.es). It also operates sites such as as RestaurantesHoy.com (restaurant listings) & CalleaCalle.com, which gives information about more than 400,000 retail outlets and includes geo-referencing. The company is also present in Argentina, Chile and Peru. Yell Publicidad was founded in 1967 and is headquartered in Madrid, Spain

Ibermática SA is a holding company engaged in the provision of information technology services to clients in the finance, insurance, telecom, energy, and public administration sectors. It offers solutions for infrastructure design and implementation, process engineering, data center administration, systems integration, business intelligence, and content management. It also provides technical consulting, outsourcing, and training. The company was founded in 1973 and is headquartered in San Sebastian, Spain.

Part of Grupo Ezentis SA, Telefonica Sistemas Ingenieria De Productos provides communication services. The private company is based in Madrid, Spain. Telefonica Sistemas Ingenieria De Productos was acquired by Grupo Ezentis SA from Telefónica SA on June 01, 2000 for $84.06 million.

Unisource Iberia SA provides telecommunication services. The private company is based in Alcobendas, Spain. Unisource Iberia was acquired by Telia AB from Unisource NV on September 01, 1999.

Part of Promotora de Informaciones SA, Via Digital SA provides pay-television programs broadcasting services. Via Digital was acquired by Prisa Television SAU from Telefónica SA on July 02, 2003 for $427.64 million.

O2 Czech Republic a.s. provides telecommunication and related services. It operates through Fixed and Mobile segments. The Fixed segment provides services using fixed network and WiFi infrastructure. The Mobile segment engages in mobile telecommunication and data services. The company was founded on December 16, 1993 and is headquartered in Prague, Czech Republic.

Part of Evolvere Capital SAS, Telefonica Publicidad e Informacao Brazil is a Brazilian company that publishes phone directories. The company is based in São Paulo, Brazil. Telefonica Publicidad e Informacao Brazil was acquired by Carvajal Información SAS, a SUB of Evolvere Capital SAS from hibu Plc on July 27, 2006 for $8.10 million.

Part of Telefónica SA, Telefónica de España SA is a private company based in Madrid, Spain. The Spanish company provides a program called ADR, which allows access to the American Depositary Receipts of Telefónica with a US certificate of the shares.

Part of Telefónica SA, Telefónica Investigación y Desarrollo SA is a private company based in Madrid, Spain. The Spanish company engages in research and development of internet of things.

Part of Accor SA, Ecotel SAS supplies and equipment for professionals in the hospitality and food industries, including restaurants, hotels, communities, and food trades. The private company is based in Evry-Courcouronnes, France. The French company offers a wide range of products and brands in plates and services, self-service platforms, table arts, and single-use items. The company was founded in 1987. Francis Martinon has been the CEO of the company since 2018.

Telefonica Group provides telecommunications services.