5 Biggest Private Security Companies in the World

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1. Allied Universal Security Services

2021 Revenue: $20 billion

Allied Universal Security Services is an American private security and staffing company, based in Conshohocken, Pennsylvania and Santa Ana, California. Formed in 2016 by the merger of AlliedBarton and Universal Services of America, Allied Universal is the world’s largest provider of security guards.

Serving clients in various industries, including commercial real estate, healthcare, education, financial institutions, government, and retail, the private security company offers access control, armed and unarmed security, fire and life safety, and emergency response. Additionally, the company also provides facility services such as janitorial and maintenance services, concierge services, and reception services.

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