Guardian Alarm Acquires Controllor Security Systems

Guardian Alarm Acquires National Central Alarm Systems

January 15, 2026

Professional Services

Guardian Alarm, a Southfield, Michigan–based full-service security company, has acquired National Central Alarm Systems, a Huntington, West Virginia–based security provider established in 1949. The acquisition expands Guardian Alarm's footprint into West Virginia and brings Guardian's monitoring technology, resources, and service capabilities to National Central Alarm Systems' residential and commercial customers.

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.

Investcorp Acquires Guardian Fire Services

December 3, 2025

Industrial Services

Investcorp has acquired Guardian Fire Services, a Nashville-based provider of fire protection and life safety services, from Northern Lakes Capital. Guardian operates 17 branches across the U.S., serving commercial, industrial, healthcare and educational customers; management will remain meaningful shareholders as Investcorp supports the company's continued growth.