| Entity Name | Type | License # | City | Status | Action |
|---|---|---|---|---|---|
| SUN COMMUNICATIONS LLC | Business | 127001084 | TROY | CANCELLED | Verify |
| SUN COMMUNICATIONS LLC | Business | 192000187 | TROY | CANCELLED | Verify |
| SUNDANCE INTERNATIONAL LLC | Business | 127001771 | STREAMWOOD | ACTIVE | Verify |
| SUNSET P I | Business | 117001028 | AURORA | INOPERATIVE | Verify |
| SUPERIOR AIR-GROUND AMBULANCE SERVICE INC | Business | 262000107 | ELMHURST | NOT RENEWED | Verify |
| SUPERIOR FIRE & SECURITY LLC | Business | 127001587 | KINGSTON | ACTIVE | Verify |
| SUPERIOR LOCK SERVICE | Business | 192000348 | CHICAGO | ACTIVE | Verify |
| SUPERIOR PROTECTION SYSTEMS INC | Business | 127000977 | TINLEY PARK | NOT RENEWED | Verify |
| SUPERIOR PROTECTION SYSTEMS INC | Business | 127000858 | ROLLING MEADOWS | NOT RENEWED | Verify |
| SUPERIOR PROTECTION SYSTEMS INC | Business | 128000076 | ELMHURST | NOT RENEWED | Verify |
| SUPERIOR SECURITY AGENCY | Business | 117000005 | CHICAGO | NOT RENEWED | Verify |
| SUPERIOR SECURITY COMPANY | Business | 122000745 | CHICAGO | NOT RENEWED | Verify |
| SUPPORT SERVICES GROUP INVESTIGATIONS INC | Business | 117000993 | COLUMBIA | NOT RENEWED | Verify |
| SUPREME INVESTIGATIONS PLLC | Business | 117001922 | CHICAGO | ACTIVE | Verify |
| SUPREME SECURITY CONSULTANTS INC | Business | 122001393 | MARKHAM | NOT RENEWED | Verify |
| SURE BIOMETRICS PLLC | Business | 262000162 | LANSING | ACTIVE | Verify |
| SURE FACTS INVESTIGATIONS COMPANY | Business | 117000017 | CALUMET CITY | NOT RENEWED | Verify |
| SURE GUARD SECURITY INC | Business | 127001264 | HAZEL CREST | NOT RENEWED | Verify |
| SURE SECURITY SYSTEMS INC | Business | 127000889 | SPRINGFIELD | NOT RENEWED | Verify |
| SURE SECURITY SYSTEMS INC | Business | 128000055 | PEORIA | NOT RENEWED | Verify |
| SURE SECURITY SYSTEMS INC | Business | 128000048 | SAVOY | NOT RENEWED | Verify |
| SURE SECURITY SYSTEMS INC | Business | 127000929 | CHICAGO | NOT RENEWED | Verify |
| SURVEILLANCE MONITORING CORPORATION | Business | 127001718 | MOKENA | NOT RENEWED | Verify |
| SURVEILLANCE TECHNOLOGIES, LLC | Business | 127001747 | BARTONVILLE | ACTIVE | Verify |
| SURVEILLANCE TRIANGLE INC. | Business | 127001745 | CHICAGO | ACTIVE | Verify |
| SWANSON SECURITY COMPANY INC | Business | 127000323 | PALOS PARK | ACTIVE | Verify |
| SYLAVEN SECURITY CONSULTING INC | Business | 122001022 | DOLTON | ACTIVE | Verify |
| SYMTEC LLC | Business | 127001612 | NORTHBROOK | ACTIVE | Verify |
| T C ENGINEERING LTD | Business | 127000181 | DOWNERS GROVE | NOT RENEWED | Verify |
| T E D ELECTRIC COMPANY | Business | 127000110 | ELMHURST | NOT RENEWED | Verify |
| T FORCE SECURITY INC | Business | 122000018 | CHICAGO | NOT RENEWED | Verify |
| T FORCE SECURITY INC | Business | 122000018 | CHICAGO | NOT RENEWED | Verify |
| T FORCE SECURITY INC | Business | 122000018 | CHICAGO | NOT RENEWED | Verify |
| T FORCE SECURITY INC | Business | 122000018 | CHICAGO | NOT RENEWED | Verify |
| T FORCE TRAINING ACADEMY | Business | 102000160 | CHICAGO | ACTIVE | Verify |
| T J LOCKSMITHING LLC | Business | 192000273 | WHEELING | ACTIVE | Verify |
| T L S INVESTIGATIONS | Business | 117000666 | BELVIDERE | NOT RENEWED | Verify |
| T P S INVESTIGATIONS | Business | 118000115 | CICERO | NOT RENEWED | Verify |
| T P S INVESTIGATIONS | Business | 117000361 | HILLSIDE | NOT RENEWED | Verify |
| T R A SECURITY SERVICES INC | Business | 201000236 | OLYMPIC FIELDS | ACTIVE | Verify |
| T R A SECURITY SERVICES INC | Business | 122000137 | CHICAGO HEIGHTS | NOT RENEWED | Verify |
| T R A SECURITY SERVICES INC | Business | 127000043 | CHICAGO HEIGHTS | NOT RENEWED | Verify |
| T R A SECURITY SERVICES INC | Business | 117000123 | CHICAGO HEIGHTS | CANCELLED | Verify |
| T W INVESTIGATIONS LTD | Business | 117000890 | GURNEE | NOT RENEWED | Verify |
| T-N-T (THE SHIELD) SECURITY TRAINING | Business | 102000344 | CHICAGO | ACTIVE | Verify |
| T. L. BRANNON INVESTIGATIONS, P.C. | Business | 117001035 | VANDALIA | NOT RENEWED | Verify |
| T&W ALARMS INC | Business | 127001589 | CALUMET CITY | ACTIVE | Verify |
| TAC 213 LLC | Business | 122001662 | PARK FOREST | ACTIVE | Verify |
| TAC 213 LLC | Business | 117001952 | PARK FOREST | ACTIVE | Verify |
| TAC SECURITY SERVICES PLLC | Business | 122001563 | CHICAGO | ACTIVE | Verify |