| Employprize (formerly Crown Employer Services) | Employprize (formerly Crown Employer Services) | — | employprize.com |
| AccessPoint (now part of Vensure) | AccessPoint (now part of Vensure) | — | accesspointhr.com |
| AlphaStaff | AlphaStaff | — | alphastaff.com |
| Medical Arts Office Services, Inc. | Medical Arts Office Services, Inc. | — | |
| ADP TotalSource | ADP TotalSource | 1 ADP Boulevard | adp.com |
| FrankCrum | FrankCrum | 100 S Missouri Ave | frankcrum.com |
| Acadia HR | Acadia HR | 1000 N Village Ave, Suite 23 | acadiahr.com |
| TrendHR | TrendHR | 1005 Technology Way | trendhr.com |
| Strategic HR Management Services | Strategic HR Management Services | 101 Riverfront Blvd Suite 300 | |
| Strategic Staffing Services | Strategic Staffing Services Inc. | 101 Riverfront Blvd Suite 300 | |
| CoAdvantage | CoAdvantage | 101 Riverfront Blvd, Suite 300 | coadvantage.com |
| Helpside | Employer Solutions Group (ESG) | 1042 Fort Union Blvd # 105 | esghr.com |
| Integrity Outsource | Integrity Outsource | 10429 S 51st St, Suite 205 | integrityoutsource.com |
| StaffScapes | StaffScapes | 1075 W 124th Ave, Suite 700 | staffscapes.com |
| Axcet HR Solutions | AXCET HR Solutions, Inc. | 10975 Grandview Dr. Ste 200 | axcethr.com |
| HR Plus | HR Plus LLC | 118 W. Fifth St. Ste 201 | |
| Stratus.hr | Stratus.hr | 120 W Vine St, Suite 300 | stratus.hr |
| Focus OneSource | Focus OneSource | 1200 Valley West Dr, Suite 706-08 | focusonesource.com |
| Propel HR | Propel HR | 1200 Woodruff Rd, Building A-3 | propelhr.com |
| Anchor QEA, Inc. | Anchor QEA, Inc. | 1201 Third Ave Suite 2600 | |
| E3 HR, Inc | E3 HR, Inc | 121 Summit Ave | |
| eEmployers Solutions | eEmployers Solutions Inc | 12211 Huebner Road | |
| Employee Resource Administration LP | Employee Resource Administration LP | 12400 Coit Rd Suite 660 | |
| Integrity Employee Leasing | Integrity Employee Leasing | 128 W Charlotte Ave | integrityel.com |
| Employer Support Services | Employer Support Services | 12824 Willow Centre Dr, Suite D | employersupport.com |
