| Xcelerate Restoration Software | Arizona |
| XcelHR | Maryland |
| Xcell Biosciences, Inc. | California |
| XCell Science | California |
| XCellAssay | California |
| XCellCure, LLC | Missouri |
| Xcellimark Digital Agency | Florida |
| XcelPros.com | Illinois |
| XCENT | Pennsylvania |
| Xcentech Computers, LLC | Arizona |
| Xcential Corporation | California |
| Xcerts.com | New York |
| Xchange Software | New Jersey |
| Xchange Telecom | New York |
| XchangeWorx | New York |
| XChat | California |
| Xcision Medical Systems, LLC | Maryland |
| Xcitium | |
| Xclaim, Inc. | California |
| XComP | |
| Xcovery | Florida |
| xCubicle | New York |
| xCures | California |
| Xdata Corporation | Colorado |
| XDuce | |
| XDuce Corporation | New Jersey |
| Xeal Energy | California |
| Xeara | Texas |
| Xebec Data Corporation | Colorado |
| Xebrawerx | Arizona |
| Xebrium, Inc. | California |
| Xecunet | Maryland |
| Xede Consulting Group, Inc. | Michigan |
| Xeeva | Michigan |
| Xellar Biosystems | Massachusetts |
| XELPHAhealth | Texas |
| Xeltek | California |
| XEmacs | Ohio |
| Xembly | Washington |
| XEME Biopharma, Inc. | New Jersey |
| Xemed, LLC | New Hampshire |
| Xemelgo, Inc. | Washington |
| Xen.AI | Delaware |
| XENA Intelligence, Inc. | Kentucky |
| Xenarc Technologies Corporation | California |
| Xenco Medical | California |
| Xencor, Inc. | California |
| Xendee | California |
| Xenetic Biosciences, Inc. | Massachusetts |
| Xenex Disinfection Services, Inc. | Texas |