Renamed Vivint, Inc. APX Alarm is a world class organization made of intelligent, friendly, and highly-trained individuals de ... dicated to the families we protect through state-of-the-art residential security systems. APX Alarm (www.apxalarm.com) is a nationwide full-service residential security company that deploys geographically-focused teams of sales representatives and installers to markets around the United States and Canada. As of 2009, APX Alarm is one of the 5 largest home security companies in the US, having sold more than 500,000 accounts since its inception. read more