| Business | Phone |
| Aegis Services Ltd 845 N Michigan Ave 1b, Chicago 60611 | (312) 787-7000 |
| Alert Security Consultants 2453 W Morse Ave, Chicago 60645 | (773) 465-5174 |
| Alert Up Ii Parr Security 5642 S Racine Ave, Chicago 60636 | (773) 778-6650 |
| All Security Svc Inc 11057 S Homewood Ave, Chicago 60643 | (773) 233-1808 |
| At Stake 70 W Madison St, Chicago 60602 | (312) 214-1015 |
| Bernardi Securities 105 W Adams St # 1900, Chicago 60603 | (312) 578-8486 |
| Bis Systems Inc 8233 S Pulaski Rd, Chicago 60652 | (773) 582-0072 |
| Gar Wood Securities Llc 440 S La Salle St 2201, Chicago 60605 | (312) 566-0740 |
| Chase Investigations 453 E 111th Pl, Chicago 60628 | (773) 785-2414 |
| Chicago Consulting Group 680 N Lake Shore Dr, Chicago 60611 | (312) 335-8192 |
| District Security Svc Inc 222 W Adams St, Chicago 60606 | (312) 236-8528 |