| Business | Phone |
| 3hc Inc 2625 Butterfield Rd, Oak Brook 60523 | (630) 928-0955 |
| Advance Innovative Solutions 2625 Butterfield Rd 109s, Oak Brook 60523 | (630) 573-1050 |
| Expert Solutions 2021 Midwest Rd, Oak Brook 60523 | (630) 953-8560 |
| Embedded Concepts & Solutions 2021 Midwest Rd, Oak Brook 60523 | (630) 705-1192 |
| Cmass Technolgoies 210 W 22nd St, Oak Brook 60523 | (630) 368-3363 |
| D P Holdings Inc 701 Harger Rd 190, Oak Brook 60523 | (630) 571-8900 |