| Business | Phone |
| Orion Systems Inc 1438 Polo Dr, Bartlett 60103 | (630) 213-9075 |
| Serena Software Inc 217 John Dr, Bartlett 60103 | (630) 213-7654 |
| Datalux Midwest Region 106 W Bartlett Ave, Bartlett 60103 | (630) 233-0285 |
| Point Systems 106 W Bartlett Ave Z, Bartlett 60103 | (630) 483-1285 |