| Business | Phone |
| Analog Devices Inc 2500 W Higgins Rd 1215, Schaumburg 60194 | (847) 519-1862 |
| Linear Technology Corp 2040 E Algonquin Rd 512, Schaumburg 60173 | (847) 925-0860 |
| Tti Inc 1435 N Plum Grove Rd D, Schaumburg 60173 | (847) 882-0375 |
| Omron Management Ctr-America 1 Commerce Dr, Schaumburg 60173 | (847) 884-0322 |