| Business | Phone |
| Advance Management 200 E Big Beaver Rd, Troy 48083 | (248) 457-4557 |
| Conoco Phillips 1650 Research Dr, Troy 48083 | (248) 526-0013 |
| Defined Employee Management 700 Tower Dr, Troy 48098 | (248) 879-9723 |
| Oakland Management Svc 360 E Maple Rd # M, Troy 48083 | (248) 583-9714 |
| Finsilver Friedman Management 3310 W Big Beaver Rd, Troy 48084 | (248) 458-1141 |