We provide all our customers customized cost-effective solutions based on their security needs, be it for your home or commercial building. Since 1983, a.p.i. Alarm Inc. is North America’s largest privately owned & operated full-service security company for commercial & residential complexes. a.p.i. Alarm is America’s largest privately owned and operated full-service security company. A position that a.p.i. Alarm has maintained year after year. We provide commercial security with protocols & systems in place along with our highly-trained and efficient staff trained to provide an immediate response.