American Tower is a holding company. Through its subsidiaries, the company is a real estate investment trusts and an independent owner, operator and developer of multitenant communications real estate. The company's primary business is the leasing of space on communications sites to wireless service providers, radio and television broadcast companies, wireless data providers, government agencies and municipalities and tenants in a number of other industries. The company also provides tower-related services, including site acquisition, zoning and permitting and structural analysis, which primarily support the company's site leasing business, including the addition of new tenants and equipment on its sites.

Microsoft is a technology company. The company develops and supports software, services, devices, and solutions. The company provides an array of services, including cloud-based solutions as well as solution support and consulting services. The company also delivers relevant online advertising. The company's products include operating systems; cross-device productivity applications; server applications; business solution applications; desktop and server management tools; software development tools; and video games. The company also designs, manufactures, and sells devices, including personal computers, tablets, gaming and entertainment consoles, other devices, and related accessories.

Qualcomm is engaged in the development and commercialization of foundational technologies for the wireless industry. The company's segments include: Qualcomm CDMA Technologies, which is a developer and supplier of integrated circuits and system software based on code division multiple access, orthogonal frequency division multiple access and other technologies; Qualcomm Technology Licensing, which grants licenses or otherwise provides rights to use portions of its intellectual property portfolio, which, among other rights, include certain patent rights essential to and/or useful in the manufacture and sale of certain wireless products; and Qualcomm Strategic Initiatives, which makes investments.

T-Mobile US provides mobile communications services, including voice, messaging and data, under its brands, T-Mobile and Metro? by T-Mobile, in the United States, Puerto Rico and the United States Virgin Islands. The company provides mobile communications services using its 4G Long-Term Evolution network and its 5G technology network. The company also provides various wireless devices, including handsets, tablets and other mobile communication devices, and accessories for sale, as well as financing through Equipment Installment Plans and leasing through JUMP! On Demand?. The company provides reinsurance for handset insurance policies and extended warranty contracts offered to its mobile communications customers.

Verizon Communications is a holding company. Through its subsidiaries, the company provides communications, information and entertainment products and services to consumers, businesses and governmental agencies. The company has two reportable segments, Verizon Consumer Group (Consumer) and Verizon Business Group (Business). The company's Consumer segment provides consumer-focused wireless and wireline communications services and products under the Verizon brand and through wholesale and other arrangements. The company's Business segment provides, among others, wireless and wireline communications services and products, video and data services, corporate networking solutions, security and managed network services.