AT&T Inc. provides telecommunications and technology services worldwide. The company operates through two segments, Communications and Latin America. The Communications segment offers wireless voice and data communications services; and sells handsets, wireless data cards, wireless computing devices, carrying cases/protective covers, and wireless chargers through its own company-owned stores, agents, and third-party retail stores. It also provides Virtual Private Networks, AT&T Dedicated Internet, Ethernet, data services, cloud solutions, outsourcing, and managed professional services, as well as customer premises equipment for multinational corporations, small and mid-sized businesses, governmental, and wholesale customers. In addition, this segment offers broadband services, including fiber connections, legacy telephony voice communication services, and other VoIP services and equipment to residential customers. This segment markets its communications services and products under the AT&T, AT&T Business, Cricket, AT&T PREPAID, and AT&T Fiber brand names. The Latin America segment provides postpaid and prepaid wireless services in Mexico under the AT&T and Unefon brand names, as well as sells smartphones through its owned stores, agents and third-party retail stores. The company was formerly known as SBC Communications Inc. and changed its name to AT&T Inc. in 2005. AT&T Inc. was incorporated in 1983 and is based in Dallas, Texas.

Verizon Communications Inc., through its subsidiaries, engages in the provision of communications, technology, information, and entertainment products and services to consumers, businesses, and governmental entities worldwide. It operates in two segments, Verizon Consumer Group (Consumer) and Verizon Business Group (Business). The Consumer segment provides wireless services across the wireless networks in the United States under the Verizon and TracFone brands and through wholesale and other arrangements; and fixed wireless access (FWA) broadband through its wireless networks, as well as related equipment and devices, such as smartphones, tablets, smart watches, and other wireless-enabled connected devices. The segment also offers wireline services in the Mid-Atlantic and Northeastern United States, as well as Washington D.C. through its fiber-optic network, Verizon Fios product portfolio, and a copper-based network. The Business segment provides wireless and wireline communications services and products, including FWA broadband, data, video and conferencing, corporate networking, security and managed network, local and long-distance voice, and network access services to deliver various IoT services and products to businesses, government customers, and wireless and wireline carriers in the United States and internationally. The company was formerly known as Bell Atlantic Corporation and changed its name to Verizon Communications Inc. in June 2000. Verizon Communications Inc. was incorporated in 1983 and is headquartered in New York, New York.

Frontier Communications Parent, Inc., together with its subsidiaries, provides communication and technology services in the United States. It offers broadband, video, voice, and other value-added services. The company also provides data and Internet, including broadband networking services; data-based voice over internet protocol, unified communications, long-distance, and voice messaging services; video services under the Frontier TV brand; access services; hardware and network solutions; and packages of services. It serves large enterprise customers, small and medium businesses, and wholesale customers. The company was formerly known as Frontier Communications Corporation and changed its name to Frontier Communications Parent, Inc. in April 2021. Frontier Communications Parent, Inc. was incorporated in 1935 and is headquartered in Dallas, Texas.

Lumentum Holdings Inc. manufactures and sells optical and photonic products in the Americas, the Asia-Pacific, Europe, the Middle East, and Africa. The company operates through two segments: Cloud & Networking and Industrial Tech. The Cloud & Networking segment offers components, modules, and subsystems to support the high-speed transmission of data over high-capacity fiber optic links in cloud data center, AI/ML, enterprise and communications services networking applications that enable the transmission and transport of data, video, and audio over high-capacity fiber-optic cables. It offers high-speed transceivers, reconfigurable optical add/drop multiplexers, coherent dense wavelength division multiplexing pluggable transceivers, and tunable small form-factor pluggable transceivers. We also sell laser chips for use in high-speed datacom transceivers and data interconnection solutions. The Industrial Tech segment offers solid-state lasers, kilowatt-class fiber lasers, ultrafast lasers, diode lasers, and gas lasers, as well as laser diode products. It serves to customers in semiconductor device, solar cell, display, electric vehicle, and battery manufacturing markets, as well as broader materials processing and precision micromachining end-markets. Lumentum Holdings Inc. was incorporated in 2015 and is headquartered in San Jose, California.

CommScope Holding Company, Inc. provides infrastructure solutions for communications, data center, and entertainment networks worldwide. The company operates through Connectivity and Cable Solutions (CCS); Outdoor Wireless Networks (OWN); Networking, Intelligent Cellular and Security Solutions (NICS), and Access Network Solutions (ANS) segments. The CCS segment provides network solutions for indoor and outdoor network applications; and fiber optic and copper connectivity and cable solutions for use in telecommunications, cable television, residential broadband networks, data centers and business enterprises. The OWN segment provides base station antennas, radio frequency filters, tower connectivity, microwave antennas, metro cell products, cabinets, steel towers, accessories, wireless Spectrum management business and Comsearch products. The NICS segment offers indoor and outdoor Wi-Fi and long-term evolution (LTE) access points, access and aggregation switches; an Internet of Things suite, on-premises and cloud-based control and management systems; and software and software-as-a-service applications. The ANS segment offers cable modem termination systems, video infrastructure, distribution and transmission equipment and cloud solutions that enable facility-based service providers to construct a state-of-the-art residential and metro distribution network. It offers its products and services through independent distributors, specialized resellers and distributors, wireless and wireline operators, original equipment manufacturers, and system integrators, as well as directly to customers. The company was formerly known as Cedar I Holding Company, Inc. and changed its name to CommScope Holding Company, Inc. in January 2011. CommScope Holding Company, Inc. was founded in 1976 and is based in Claremont, North Carolina.

Ribbon Communications Inc. provides communications technology in the United States, Europe, the Middle East, Africa, the Asia Pacific, and internationally. It operates through two segments, Cloud and Edge, and IP Optical Networks. The Cloud and Edge segment provides software and hardware products, solutions, and services for voice over internet protocol communications, voice over long-term evolution, and voice over 5G communications, and unified communications and collaboration. It also offers session border controllers; and network transformation products, such as signaling products, call controllers, media gateways, and application servers. This segment serves private, public, or hybrid cloud infrastructures, as well as data centers, enterprise premises, and service provider networks. The IP Optical Networks segment provides hardware and software products and solutions for IP networking, switching, routing, and optical transport for technologies, such as 5G, distributed cloud computing, and corresponding applications. It also offers multiple solutions, including 5G-native solutions for mobile-backhaul, metro and edge aggregation, core networking, data center interconnect, multi-service access, and transport solutions for wholesale carriers. This segment serves utilities, government, defense, finance, transportation, and education and research industries, as well as service providers and enterprises. The company was formerly known as Sonus Networks, Inc. and changed its name to Ribbon Communications Inc. in November 2017. Ribbon Communications Inc. was founded in 1997 and is headquartered in Plano, Texas.

Consolidated Communications Holdings, Inc., together with its subsidiaries, provides broadband and business communication solutions for consumer, commercial, and carrier channels in the United States. It offers high-speed broadband Internet access, SIP trunking, and voice over Internet protocol (VoIP) phone services; commercial data connectivity services in various markets, including Ethernet services, private line data services, software defined wide area network, and multi-protocol label switching services; networking services; cloud-based services; and data center and disaster recovery solutions. The company also provides voice services, such as local phone and long-distance services; and high-speed fiber data transmission services to regional and national interexchange; and wireless carriers, including Ethernet, cellular backhaul, dark fiber, and colocation services. In addition, it sells business equipment, as well as offers related hardware and maintenance support, video, and other miscellaneous services. Further, the company offers video services comprising high-definition television, digital video recorders (DVR), and/or a whole home DVR; and in-demand streaming TV services that provide endless entertainment options. Additionally, it provides network access services that include interstate and intrastate switched access, network special access, and end user access; and telephone directory publishing, video advertising, billing and support, and other miscellaneous services. The company was founded in 1894 and is headquartered in Mattoon, Illinois.

ATN International, Inc., through its subsidiaries, engages in the provision of digital infrastructure and communications services to residential, business, and government customers in the United States and internationally. The company operates through International Telecom and US Telecom segments. The company offers mobile, data, voice, broadband, and fixed services; handsets and accessories; and wholesale roaming, long distance voice services, and site maintenance services. It also leases critical network infrastructure, including towers and transport facilities; and provides managed information technology services, such as network, application, infrastructure, and hosting services. The company was formerly known as Atlantic Tele-Network, Inc. and changed its name to ATN International, Inc. in June 2016. ATN International, Inc. was founded in 1987 and is headquartered in Beverly, Massachusetts.