Carlos Slim Helú

SBC Communications, Inc. provides telecommunications services primarily in the United States. It offers various services and products, such as local exchange services, wireless communications, long-distance services, Internet services, telecommunications equipment, and directory advertising and publishing services. The company provides landline telecommunications services, such as local, long-distance voice, switched access, data and messaging services, and satellite television services; mobile wireless voice and data communications services; and directory services, such as advertising, Yellow and White Pages directories, and electronic directory publishing

Teléfonos de México SAB de CV is a telecommunications company. It is engaged in owning and operating a fixed-line telecommunications system, offering connectivity, Internet access, co-location, hosting and interconnection services. The company was founded on December 23, 1920 and is headquartered in Mexico City, Mexico.

Cementos Portland Valderrivas SA engages in cement and building materials manufacturing and has interests in real estate and financial services. It operates through the following segments: manufacture and sale of cement, concrete, aggregates, mortar and others. The company was founded in 1903 and is headquartered in Pamplona, Spain.

América Telecom SA de CV provides cellular and telecommunication services. It provides telecommunication services, through its subsidiary Telcel, in the nine mobile regions into which Mexico is divided. Its other subsidiaries include Corporativo Empresarial en Telecomunicaciones, Orca, Technology Fund One, Enitel Intelsat, Construccion y Servicios Internacionales, Techtel LMDS Comunicaciones Interactivas SA, Telet SA, Americel SA, Comunicacion Celular SA, Consorcio Ecuatoriano de Telecomunicaciones SA, Telecomunicaciones de Guatemala, SA, Telcel CompUSA, Inc., TracFone Wireless, Inc., Arbros Communications, Inc. and Genesis Telecom CA, which operate in various countries in the American continent. The company was founded in December 2001 and is located in Mexico City, Mexico.

Carso Global Telecom SAB de CV is engaged in providing telecommunication services. The company was founded on June 24, 1996 and is headquartered in Mexico City, Mexico.

Inversora Carso SA de CV provides real estate and broking services. It offers purchasing, selling, managing, and constructing real estate properties. The company was founded on January 26, 1966 and is headquartered in Mexico City, Mexico.

The RAND Corp. engages in conducting research and analysis to improve policy and decision-making. Its services include benchmarking, case study analysis, cost analysis, economic analysis, modeling, simulation, and optimization, performance measurement and measurement development, policy analysis, program evaluation, risk assessment and analysis, strategic planning, survey research, and technology assessment and development. The company was founded on May 14, 1948 and is headquartered in Santa Monica, CA.

Carso Infraestructura y Construcciones SA de CV provides engineering and construction services. The firm designs and builds oil and gas pipeline installations, power generation facilities, telecommunications infrastructure, residential buildings, office spaces, industrial complexes, commercial centers and road works, including tunnels, bridges and highways. It also fabricates and assembles equipment and ancillary structures for oil rigs and drilling platforms. The company was founded in 1999 and is headquartered in Mexico City, Mexico.

Inversora Bursátil SA de CV provides securities brokerage and investment management services. Its service portfolio includes shares and public securities. The company is headquartered in Mexico City, Mexico.

Promotora del Desarrollo de America Latina SA de CV acquires, develops, and promotes infrastructure projects. It operates as a subsidiary of Impulsora del Desarrollo y el Empleo en America Latina SAB de CV. The company is headquartered in Mexico City, Mexico

Centro Historico de la Ciudad de Mexico SA de CV owns and operates a tourist center and historical buildings. The private company is based in Mexico City, Mexico.

Inmuebles Carso SA de CV is a holding company. It engages in developing, selling and leasing real estate properties and managing residential real estate developments through its subsidiaries. The company was founded on November 4, 2010 and is headquartered in Mexico City, Mexico.

Mexican Stock Exchange operates as a stock exchange for listed derivatives and OTC markets. It offers market information, market data, listed issuers, listings and prospectus and public offerings to the public. The company is headquartered in Cuauhtémoc, Mexico.