This Research Note examines the major Johnson Controls UK businesses relating to building automation, fire and security systems, highlighting their latest financial data, year ending 30th September 2024.  It is based on the annual reports of 3 companies, Johnson Controls Building Efficiency (UK), Tyco Fire & Integrated Solutions (UK) and ADT Fire & Security.  We also assess the inorganic growth initiatives of Johnson Controls (JCI) in the UK through a series of 8 acquisitions in the last 3 years. Johnson Controls in the UK ADT Fire and Security plc is the largest of JCI’s three UK entities, with 2,466 employees and £395.0m in revenue in 2024, focusing on electronic security, fire systems, and building management services. Tyco Fire & Integrated Solutions (UK) Ltd sits in the middle with 937 employees and £213.5m turnover, specializing specifically in fire protection systems. Johnson Controls Building Efficiency (UK) reports 526 employees and £131.7m revenue, concentrating on air conditioning and […]