| Work in Progress | Nevada |
| Work Market, Inc. | New York |
| Work Media, LLC | |
| Work Shield, Inc. | |
| Work-Bench | New York |
| work4labs | California |
| Workable Software Ltd | Massachusetts |
| Workable Web Solutions | Maryland |
| Workamajig | Arizona |
| Workana, LLC | |
| Workarea | Pennsylvania |
| Workato | California |
| Workbar, LLC | Massachusetts |
| Workbeast | Florida |
| WorkBoard, Inc. | California |
| Workbox Company | Illinois |
| Workbox, Inc. | California |
| Workbrew | |
| WorkClout | California |
| Workday, Inc. | California |
| Workdays, Inc. | |
| Workera | California |
| Workfall Pte Ltd | |
| Workflow | California |
| WorkflowMania, Inc. | Texas |
| Workforce Logic | Florida |
| WorkForce Software, LLC | Michigan |
| Workfront, Inc. | Utah |
| WorkFusion, Inc. | New York |
| Workglue, Inc. | Colorado |
| Workgroup Connections | Missouri |
| WorkHands | |
| Workhelix, Inc. | |
| Workhorse Collective, LLC | District of Columbia |
| Workhorse Development, Inc. | |
| Workhorse Marketing | Texas |
| WorkHouse | New York |
| WorkHub Platform, Inc. | California |
| Workhuman | Massachusetts |
| Workhy | New Jersey |
| Working Excellence | |
| Working Lab Capital | District of Columbia |
| Working Not Working | |
| Working Planet | Rhode Island |
| Working Systems | Washington |
| Working Web Solutions | |
| WorkingNet.com | Maryland |
| WorkingPoint, Inc. | |
| Workinman Interactive, LLC | |
| Workiom, Inc. | |