| Stack Browser | Delaware |
| Stack Builders, Inc. | |
| Stack Exchange, Inc. | New York |
| STACK Infrastructur | |
| Stack Overflow | New York |
| Stack Overflow Blog | New York |
| Stack Overlap, LLC | |
| Stack Sports | Texas |
| StackArmor | |
| Stackbit | California |
| Stackblaze, Inc. | |
| StackBlitz, Inc. | |
| Stackby | |
| StackCommerce | California |
| StackFrame | Florida |
| StackGen | |
| Stackgenie | |
| StackHawk, Inc. | Colorado |
| StackIdentity | California |
| Stackify, LLC | Missouri |
| Stackit Digital, Inc. | |
| Stackline | Washington |
| Stacklok | Washington |
| StackOne | California |
| StackPath, LLC | Texas |
| Stackpop | |
| Stackshare | California |
| StackStorm | California |
| Stadia Maps, Inc. | Michigan |
| Stadion Capital | Ohio |
| Stadium | |
| Staff Finders, Inc. | Oregon |
| Staff Trak | Ohio |
| Staffall | Rhode Island |
| Staffinder | Washington |
| Staffing 360 Solutions, Inc. | New York |
| Staffing Engine | Colorado |
| StaffingSoft, Inc. | Texas |
| StaffKit, Inc. | Missouri |
| Staffmark Group | Ohio |
| Stafford Associates | New York |
| Stafftacular, LLC | |
| Stage Group Holdings, Inc. | |
| Stage1.Design | Michigan |
| Stage2 Innovations | Michigan |
| StageBio | Maryland |
| StageDotO Ventures | Idaho |
| StageTools, LLC | Virginia |
| Stagwell | New York |
| Staid Logic | Ohio |