its mobile subsidiaries

The entity "its mobile subsidiaries" refers to the mobile telecommunications arms of AT&T Inc., primarily AT&T Mobility LLC. AT&T Inc. is a publicly traded multinational telecommunications company headquartered in Dallas, Texas. Traded on the New York Stock Exchange under the ticker T, AT&T is one of the world's largest telecommunications companies. For the fiscal year 2025, AT&T reported revenue of $125.6 billion and had approximately 133,000 employees.

AT&T is a major operating company providing extensive telecommunications services. Its Communications division offers mobile and fixed-line (landline) telephone services, broadband and fiber internet, and business solutions. AT&T Mobility is the third-largest wireless carrier in the United States, providing nationwide mobile voice and data services to consumer and business customers under the AT&T and Cricket Wireless brands. The company also operates FirstNet, a dedicated nationwide network for first responders and public safety agencies.

The company’s patent litigation posture, based on the provided data, is that of a large operating company defending its products and services. The single tracked case shows AT&T and its subsidiaries as defendants, with zero cases as a plaintiff, a common position for companies targeted by patent assertion entities. This lawsuit was filed in the U.S. District Court for the Eastern District of Texas, a venue frequently chosen by patent plaintiffs.

The tracked case, Headwater Research LLC v. AT&T Inc. et al., involves a patent assertion entity targeting AT&T's mobile operations. Headwater Research is a non-practicing entity that has filed similar patent infringement lawsuits against other major telecommunications and technology companies, including Verizon and Samsung, involving patents related to mobile and wireless technology.