Security company for services

ADT: Known for home security systems and monitoring services.
Securitas: Provides a wide range of security services including guarding, monitoring, and consulting.
G4S: Offers security solutions including manned security, electronic security, and risk management services.
Allied Universal: Provides security services for a variety of industries including commercial, residential, and retail.
Prosegur: Offers integrated security solutions globally, including surveillance, alarms, and cash handling.