AT&T Inc. is an American multinational telecommunication holding company that is Delaware-registered but headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the world's largest telecommunications company by revenue and the third largest provider of mobile telephone services in the U.S. As of 2022, AT&T was ranked 13th on the Fortune 500 rankings of the largest United States corporations, with revenues of $168.8 billion.

AT&T* has completed its previously announced acquisition of AlienVault®, accelerating AT&T’s vision for giving organizations of all sizes access to more effective cybersecurity solutions. The market-facing AT&T cybersecurity solutions business division will be led by AlienVault President and CEO Barmak Meftah. Meftah will become president of AT&T Cybersecurity Solutions and CEO of AlienVault. He will report to Thaddeus Arroyo, CEO, AT&T Business. Meftah will combine the strengths of AlienVault’s foundational Unified Security Management platform and Open Threat Exchange with AT&T’s suite of managed cybersecurity services, solutions and network visibility to better protect businesses. AT&T’s new standalone cybersecurity solutions business division will focus on making AT&T’s extensive cybersecurity capabilities and technologies accessible to businesses of all sizes around the globe.