other subsidiaries of AT&T Inc.

AT&T Inc. is an American multinational telecommunications company, publicly traded on the New York Stock Exchange under the ticker symbol "T." While its origins trace back to Alexander Graham Bell's Bell Telephone Company in 1876, the modern AT&T Inc. was formed in 2005 when SBC Communications acquired the original AT&T Corporation and adopted its name. The company is headquartered at the Whitacre Tower in Downtown Dallas, Texas, though it plans to move its global headquarters to Plano, Texas, starting in late 2028. AT&T is a substantial enterprise, reporting revenues of $125.6 billion in 2025 and employing approximately 133,030 people as of the same year.

AT&T offers a wide array of telecommunications products and services. Its core business includes wireless voice and data services, broadband internet (fiber and fixed wireless), and business solutions. The company is recognized as a major wireless carrier in the United States and a significant fiber internet provider, offering services like 5G wireless and multi-gig fiber home internet. Beyond consumer offerings, AT&T provides enterprise solutions such as internet access, private networking, security, voice services, and IoT solutions.

In terms of patent litigation, AT&T Inc., through its subsidiaries, primarily maintains a posture as an operating company defending against suits. The provided case data indicates one tracked case where "other subsidiaries of AT&T Inc." appear as a defendant and zero cases as a plaintiff. This single tracked case, Lemko Corporation v. AT&T Inc. et al., filed on March 17, 2025, is in the U.S. District Court for the Eastern District of Texas, a venue often associated with patent litigation. This demonstrates AT&T's involvement in defending its operations from patent assertions rather than actively pursuing patent infringement claims as a plaintiff.