leading security guard companies in the US. ADT. Location: everywhere (more than 200 offices) ... Brink's. Control Risks. Covenant Aviation Security. DynCorp International. Epic Security Systems. In line with security guard company Allied Universal. American Hawk Security. In the US, how many security guard companies are there? In the US, how many companies will be involved in the security services sector in 2022? As of 2022, there were 11,719 security services companies in the US, a 1.8% growth from 2021.