| Zamp HR | Zamp HR | 43 S 1000 E, Suite 100 | zamphr.com |
| XMI Human Resource Solutions | XMI Human Resource Solutions | 618 Church St, Suite 520 | xmigrowth.com |
| XcelHR | XcelHR | 8120 Woodmont Ave, Suite 1100 | xcelhr.com |
| Vensure Employer Services | VensureHR | 2600 W Geronimo Pl, Suite 100 | vensure.com |
| UniqueHR | UniqueHR | 4646 Corona Dr | uniquehr.com |
| Trion Solutions | Trion Solutions | 340 E Big Beaver Rd, Suite 170 | trionworks.com |
| TriNet | Employers Resource (now part of TriNet) | One Park Place, Suite 600 | trinet.com |
| TrendHR | TrendHR | 1005 Technology Way | trendhr.com |
| Total Team Solutions | Total Team Solutions | 393 Center St | tts-ct.com |
| Total HR Management | Total HR Management | 5855 Green Valley Cir, Suite 110 | totalhrmgmt.com |
| Tandem HR | Tandem HR | 900 Jorie Blvd, Suite 200 | tandemhr.com |
| SWBC Professional Employer Services | SWBC Professional Employer Services | 9311 San Pedro Ave, Suite 600 | swbc.com |
| Surge Resources | Surge Resources | 410 Belmont St | surgenh.com |
| Stratus.hr | Stratus.hr | 120 W Vine St, Suite 300 | stratus.hr |
| Strategic Staffing Services | Strategic Staffing Services Inc. | 101 Riverfront Blvd Suite 300 | |
| Strategic HR Management Services | Strategic HR Management Services | 101 Riverfront Blvd Suite 300 | |
| Stitch Employment Services | Stitch Employment Services, Inc. | 3130 Balfour Road Suite D-508 | |
| StaffScapes | StaffScapes | 1075 W 124th Ave, Suite 700 | staffscapes.com |
| StaffPro | StaffPro, Inc. | 167 Lawrence Avenue | |
| StaffLink Outsourcing | StaffLink Outsourcing | 8200 NW 41st St, Suite 200 | stafflinkusa.com |
| Staffing Boutique, Inc. | Staffing Boutique, Inc. | 99 Hudson Street 5th Floor | |
| StaffCo of Brooklyn, LLC | StaffCo of Brooklyn, LLC | 450 Clarkson Avenue Mail Stop 1280 | |
| Staff One HR | Staff One, LLC | 2054 Vista Parkway Suite 300 | |
| SouthEast Personnel Leasing | SouthEast Personnel Leasing, Inc. (SPLI) | 2739 US-19 | spli.com |
| Rippling (PEO) | Rippling (PEO) | 430 California St, 11th Floor | rippling.com |
