| MONDAY SECURITY CORPORATION | Business | 127000958 | CAHOKIA | NOT RENEWED | Verify |
| M & R ELECTRONIC SYSTEMS INC | Business | 127000971 | LINCOLNSHIRE | ACTIVE | Verify |
| K & F ELECTRIC INC | Business | 127000988 | BELLEVILLE | NOT RENEWED | Verify |
| CHICAGOLAND SECURITY, INC. | Business | 127001004 | ELK GROVE VILLAGE | NOT RENEWED | Verify |
| SECURE ONE SECURITY SYSTEMS INC | Business | 127001015 | DOWNERS GROVE | NOT RENEWED | Verify |
| TRICOR SECURITY GROUP INC | Business | 127001017 | CICERO | INOPERATIVE | Verify |
| SENTRY FIRE PROTECTION SYSTEMS COMPANY INC | Business | 127001018 | RIVER GROVE | NOT RENEWED | Verify |
| STEALTH SECURITY SYSTEMS INC | Business | 127001074 | ALGONQUIN | NOT RENEWED | Verify |
| E NORMAN SECURITY SYSTEMS INC | Business | 127001076 | NAPERVILLE | ACTIVE | Verify |
| UNITED CABLING SYSTEMS INC | Business | 127001078 | ELK GROVE VILLAGE | NOT RENEWED | Verify |
| LV TECH INC | Business | 127001091 | MARENGO | ACTIVE | Verify |
| SECURITY TECHNOLOGIES GROUP INC. | Business | 127001094 | WOOD DALE | CANCELLED | Verify |
| PREFERRED SECURITY INC | Business | 127001099 | AURORA | NOT RENEWED | Verify |
| CUSTOM AUDIO & VIDEO INSTALLATIONS INC | Business | 127001101 | TROY | NOT RENEWED | Verify |
| VALOR POWER, LIGHT AND COMMUNICATIONS, INC. | Business | 127001105 | RIVER GROVE | NOT RENEWED | Verify |
| GMK SECURITY SYSTEMS INC | Business | 127001110 | WEST CHICAGO | NOT RENEWED | Verify |
| FRUHAUF ENTERPRISES INC | Business | 127001113 | LOMBARD | NOT RENEWED | Verify |
| SAFEHOME SECURITY | Business | 127001119 | CARY | INOPERATIVE | Verify |
| ABLE SECURITY SYSTEMS INC | Business | 127001124 | SPRINGFIELD | NOT RENEWED | Verify |
| CASTLE PROTECTION GROUP INC | Business | 127001129 | CHICAGO | NOT RENEWED | Verify |
| FIRECOM ILLINOIS INC | Business | 127001131 | SCHAUMBURG | NOT RENEWED | Verify |
| NDM ELECTRIC INC | Business | 127001148 | CHICAGO | CANCELLED | Verify |
| CHICAGO ALARMS INC | Business | 127001165 | WEST DUNDEE | NOT RENEWED | Verify |
| FIRE MASTER TECHNOLOGIES LLC | Business | 127001167 | NEW LENOX | NOT RENEWED | Verify |
| BURKE SOUND & COMMUNICATION INC | Business | 127001189 | ELGIN | NOT RENEWED | Verify |
| SPINEWIRE TECHNOLOGIES INC | Business | 127001196 | CHICAGO | NOT RENEWED | Verify |
| FIRE & SECURITY SERVICES INC | Business | 127001202 | OSWEGO | NOT RENEWED | Verify |
| ONGUARD HOME PROTECTION LLC | Business | 127001231 | CARY | CLOSED | Verify |
| CASTLEROCK SECURITY GROUP INC | Business | 127001233 | SCHAUMBURG | NOT RENEWED | Verify |
| INTELLIGENT SYSTEMS SERVICES INC | Business | 127001256 | WOOD DALE | ACTIVE | Verify |
| LOW VOLTAGE WORKS INC | Business | 127001258 | ELMHURST | ACTIVE | Verify |
| NORTHROP GRUMMAN INFORMATION TECHNOLOGY INC | Business | 127001271 | CHICAGO | NOT RENEWED | Verify |
| M J ALARM SERVICES LLC | Business | 127001284 | ELGIN | INOPERATIVE | Verify |
| UNITED SECURITY SERVICES INC | Business | 127001305 | CHICAGO | INOPERATIVE | Verify |
| GLOBAL ELECTRONICS INTEGRATORS INC | Business | 127001309 | MANTENO | NOT RENEWED | Verify |
| MEDLIN COMMUNICATIONS INC | Business | 127001328 | BURR RIDGE | INOPERATIVE | Verify |
| G4S SECURE INTEGRATION LLC | Business | 127001336 | ROMEOVILLE | CANCELLED | Verify |
| KOENER ELECTRIC INC | Business | 127001395 | PEORIA | ACTIVE | Verify |
| ADVANTAGE ELECTRIC & TECHNOLOGIES LLC | Business | 127001400 | ALSIP | ACTIVE | Verify |
| LEADING EDGE TECHNOLOGIES | Business | 127001434 | ROCKFORD | CLOSED | Verify |
| HERITAGE TECHNOLOGY SOLUTIONS | Business | 127001438 | CRESTWOOD | ACTIVE | Verify |
| DRS TECHNOLOGIES INC | Business | 127001440 | CHICAGO | NOT RENEWED | Verify |
| DRS TECHNOLOGIES INC | Business | 127001440 | CHICAGO | NOT RENEWED | Verify |
| COMPUTER POWER SYSTEMS INC | Business | 127001464 | GRAYSLAKE | NOT RENEWED | Verify |
| KG HERMAN COMPANIES INC | Business | 127001465 | PRAIRIE VIEW | INOPERATIVE | Verify |
| REX ELECTRIC & TECHNOLOGIES LLC | Business | 127001476 | CHICAGO | ACTIVE | Verify |
| GEARY ELECTRIC INC | Business | 127001488 | NORTHBROOK | NOT RENEWED | Verify |
| AMERICAN FIRE & SECURITY LLC | Business | 127001489 | ORLAND PARK | NOT RENEWED | Verify |
| RIVERBEND SECURITY SOLUTIONS LLC | Business | 127001491 | ALTON | NOT RENEWED | Verify |
| PREFERRED SECURITY SOLUTIONS LLC | Business | 127001492 | CHICAGO | NOT RENEWED | Verify |