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10 Largest Security Companies in the World (2026 Update)
A security company specializes in providing both armed and unarmed security services to residential and commercial clients. These companies offer a range of services, including guard and patrol services, bodyguards, guard dogs, and parking security. Many also deliver advanced operational services aimed at preventing unauthorized activity or entry, regulating traffic, managing access control, and fire and theft prevention and detection.
The security industry is experiencing rapid growth worldwide, with the U.S. security sector alone valued at approximately $350 billion. As businesses and individuals increasingly prioritize safety and security, the demand for comprehensive security solutions continues to rise.
Here are the 10 Largest Security Companies in the World (2026)
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G4S Secure Solution – London, England, UK
Revenue (2020): $9.76 billion
Founded in 2004 through the merger of Securicor (London) and Group 4 Falck (Denmark), G4S Secure Solution offers a diverse range of services, including security personnel, monitoring equipment, response units, and secure prisoner transportation. The company operates in over 90 countries, making it the world’s third-largest private employer and a significant player on the London Stock Exchange.
G4S segments its services into security solutions for commercial and government organizations, as well as cash solutions for managing cash cycles for banks and retailers.
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Securitas Services – Stockholm, Sweden
Revenue (2020): $9.23 billion
Founded in 1934, Securitas is a global leader in security services and operates in 53 countries. The company has expanded through strategic acquisitions and now offers specialized services such as brand protection, due diligence, background checks, investigations, and IT security.
Securitas is known for its commitment to innovative security solutions, including cyber surveillance and executive protection.
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Allied Universal – Santa Ana, California, USA
Revenue (2020): $8.3 billion
This major American provider of security and janitorial services was formed in 2016 from the merger of Universal Services of America and AlliedBarton Security Services. Allied Universal is now the largest security guard provider in the U.S., offering a wide array of security products and services, including advanced alarm detection and IP-based video systems.
In recent years, the company has faced challenges including a ransomware incident in 2019, but continues to grow, especially after acquiring G4S for $5.1 billion.
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Booz Allen Hamilton – McLean, Virginia, USA
Revenue (2020): $6.7 billion
Founded in 1914, Booz Allen Hamilton provides consulting and engineering services to various sectors, including government and nonprofit organizations. The firm has made significant strides in cybersecurity, becoming a major provider for the SEC following a substantial contract award.
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ADT – Boca Raton, Florida, USA
Revenue (2020): $5.13 billion
ADT Inc. specializes in electronic security and fire protection services for both residential and commercial clients. With roots dating back to 1863, ADT has evolved and expanded through numerous acquisitions, becoming a trusted name in security systems.
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CACI International – Arlington County, Virginia, USA
Revenue (2020): $4.35 billion
CACI is a major provider of professional services and technology solutions, primarily for defense, intelligence, and homeland security sectors. Established in 1962, the company continues to grow through acquisitions, enhancing its capabilities in IT and information management.
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The Brink’s – Richmond, Virginia, USA
Revenue (2020): $3.94 billion
Brink’s is known for its armored transportation and security services, operating in over 100 countries. The company has expanded its service offerings through strategic acquisitions and is recognized for its secure logistics solutions.
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DynCorp – McLean, Virginia, USA
Revenue (2020): $3.04 billion
DynCorp is a private military contractor with a long history of providing support services to the U.S. federal government. As a key player in military operations, the company offers a range of services, including flight operations, training, and security for various government agencies.
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Garda Security Canada – Montreal, Quebec, Canada
Revenue (2020): $666.79 million
Garda Security specializes in protective services, aviation services, and cash services. The company is known for its international protective services, which include crisis management and diplomatic protection. GardaWorld has expanded significantly through acquisitions over the years.
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Control Risks Group Holdings – London, United Kingdom
Revenue (2020): $223.3 million
Control Risks provides risk consultancy services with a focus on political and security risks. Established in 1975, the company supports clients in navigating complex environments, offering expert analysis and crisis management training.
Find G4S Secure Solution Jobs Near Me
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Find Garda Security Canada Jobs Near Me
As the security landscape continues to evolve, these companies are at the forefront, adapting to new challenges and leveraging technology to provide innovative solutions for safety and security. If you’re considering a career in the security industry, exploring opportunities with these major players can be a promising path.
- Services
- Largest Advertising Companies
- Largest Law Firms
- Largest Insurance Companies
- Largest For Profit Education Companies
- Largest Lobbyist Companies
- Largest Consulting Firms
- Largest Photography Companies
- Largest Engineering Companies
- Largest Marketing Companies
- Largest Multi Level Marketing Companies
- Largest HR Companies
- Largest PR Firms
- Largest Warehousing Companies
- Largest Waste Management Companies
- Largest Janitorial Companies
- Largest Temp Agencies
- Largest Security Companies
- Largest Recruiting Firms
Author
Caitlin Mazur is a freelance writer at Zippia. Caitlin is passionate about helping Zippia’s readers land the jobs of their dreams by offering content that discusses job-seeking advice based on experience and extensive research. Caitlin holds a degree in English from Saint Joseph’s University in Philadelphia, PA.
