Top 10 Security and Investigations companies for December 2025

Listed below are the leading companies by employees as of December 2025 in the Security and Investigations industry View additional information on some of the top companies such as their contact details, employees, location, growth areas, and much more.Understand the competition, and find opportunities for growth.

	Company	Industry	Location	Employees
1	G4S	Security and Investigations
2	Allied Universal	Professional Services
3	Prosegur	Security and Investigations
4	Securitas Security Services USA, Inc.	Security and Investigations
5	ADT	Consumer Services
6	GardaWorld	Security and Investigations
7	Kroll	Business Consulting and Services
8	Convergint	Security and Investigations
9	Certis	Security and Investigations
10	The GEO Group, Inc.	Security and Investigations