5 Best Home Security System Companies in 2023

2. ADT, Inc.

No. of mentions: 5

Insider Monkey Score: 4.6 out of 5

Founded in 1874, American District Telegraph, ADT, Inc. (NYSE:ADT) is the oldest home security company in the United States. Initially, it provided its customers with a telegraphed alert system for security. With the integration of emerging technologies, it expanded its offerings to advanced products and services including alarm systems, indoor and outdoor security cameras, doorbells, and a mobile app for remote access and monitoring. It is ranked 2 on our list.