Guardian Alarm Acquires National Central Alarm Systems

Guardian Alarm Acquires Controllor Security Systems

January 9, 2026

Professional Services

Guardian Alarm, a Southfield, Michigan-based full-service security company, has acquired Controllor Security Systems, a long-established Metro Detroit security provider serving residential and commercial customers for more than 40 years. The acquisition expands Guardian Alarm's presence in Michigan and brings Controllor's local customers access to Guardian's broader portfolio of monitoring, video surveillance, access control and life-safety services.

Guardian Alarm Acquires ProAlert Security Systems

December 19, 2024

Professional Services

Guardian Alarm, a Southfield, Michigan–based full-service security company, has completed its acquisition of Cincinnati-based ProAlert Security Systems. The deal expands Guardian Alarm's customer base and capabilities in the Cincinnati market, allowing it to deliver security and fire alarm services to more residential and commercial customers.

Guardian Alarm Acquires S&S Security Alarms

January 1, 2025

Professional Services

Guardian Alarm, a large full-service U.S. security company, has acquired S&S Security Alarms of Searcy, Arkansas. The deal marks Guardian Alarm's entry into Arkansas and Guardian will continue to operate the local business under the S&S Security Alarms name to serve residential and commercial customers with enhanced capabilities and innovation.

Guardian Alarm Acquires Columbus-Based SDG Security

September 30, 2024

Professional Services

Guardian Alarm has completed the acquisition of Columbus-based SDG Security, expanding its footprint in Ohio and enabling the company to offer its residential and commercial security and fire alarm services to more customers in the Columbus market. The deal brings SDG's customers and local team into Guardian Alarm's operations; SDG co-owner Bruce Reedy commented on confidence in Guardian Alarm continuing SDG's tradition of service.

Clarion Security Acquires Federal Alarm

April 7, 2025

Professional Services

Clarion Security, a Memphis-based security guard services provider, has acquired Federal Alarm, a Memphis alarm installation and monitoring company. The deal expands Clarion's service portfolio by adding alarm installation, monitoring, fire alarm, access control and video surveillance capabilities and broadens its regional footprint in the Mid‑South.

Centroid Systems Acquires Guardian Eagle

June 14, 2022

Cybersecurity

Centroid Systems, LLC has completed the acquisition of Guardian Eagle, a St. Petersburg, Florida-based database security consulting firm. The deal expands Centroid's data security capabilities and expert resources to strengthen its end-to-end cloud transformation, consulting and managed services and to extend its presence in the U.S. Southeast.