- Abelica Global Ltd
- Adecco Group AG
- Advtech Limited
- Allegiant Physician Services, Inc.
- Allegis Group
- Allied Healthcare International Inc
- AMN Healthcare Services Inc
- Analysts International Corporation
- Aon Hewitt
- ATC Healthcare Inc
- Axiom Management Inc.
- Barrett Business Services Inc
- BG Staffing Inc
- BGRS
- Capita PLC
- Career Design Center Co Ltd
- Columbus Networks Corporation
- Command Center Inc
- Computer Task Group Inc
- Concorde America, Inc.
- Conex MD, Inc.
- CPL Resources PLC
- Cross Country Healthcare Inc
- Datrose
- DIP corp
- DLH Holdings Corp
- Edenred SA
- First Rate Staffing
- Fullcast Holding Co Ltd
- GEE Group Inc
- Genius Technologies, Inc.
- Global IT Holdings, Inc.
- Harvey Nash Group PLC
- Hay Group
- Hays plc
- Healthcare Locum Limited
- Heidrick & Struggles International Inc
- Hotline to HR Inc
- iMing Corp
- Impellam Group PLC
- IMS People
- JobStreet
- Judge Group Inc (The)
- Kelly Outsourcing & Consulting Group
- Kelly Services Inc
- Kforce Inc
- Korn/Ferry International
- Labor Smart Inc
- ManpowerGroup Inc
- Mastech Digital Inc
- Medistaff Corp
- Meitec Corp
- Mercer LLC
- Morneau Shepell Inc.
- NorthgateArinso Inc (dba NGA Human Resources)
- On Assignment Inc
- People Corporation
- Profit Planners Management Inc
- Randstad Holding NV
- Recruit Holdings Co Ltd
- Resources Connection Inc
- Resourcing Solutions Group, Inc.
- Robert Half International Inc
- Segal Group Inc (The)
- ShiftPixy
- SkillStorm Inc
- Southern Home Medical Equipment Inc
- Staffing 360 Solutions Inc
- Staffmark
- SThree PLC
- Team America Inc
- Temp Holdings Co
- TPI International Inc
- TransForce Inc
- TriNet Group Inc
- Trueblue Inc
- TSR Inc
- USG People BV
- Verisk Analytics Inc
- Volt Information Sciences Inc
- Willis Towers Watson Public Limited Company
- Wonolo Inc