| Xigla Software | Florida |
| Xignite, Inc. | California |
| Xilinx | California |
| Xilio Therapeutics, Inc. | Massachusetts |
| Xilis, Inc. | North Carolina |
| Xillent Studio | California |
| XiltriX | California |
| XIM, Inc. | California |
| Ximedica | Rhode Island |
| Ximple Solutions | Maryland |
| Xinuos, Inc. | California |
| Xiph.Org | Massachusetts |
| Xiphos Systems Corporation | |
| xiQ, Inc. | California |
| XiRepair, LLC | Alabama |
| Xirsys | California |
| Xisle Graphix | North Carolina |
| XIT Communications | |
| Xitoring, LLC | |
| Xitron, LLC | Michigan |
| Xivic, Inc. | California |
| XKEY Labs | California |
| Xkitz Electronics | California |
| XL Development | California |
| XL Digital Marketing | Texas |
| XL Modeling | New York |
| XL Technologies, LLC | Florida |
| XL.net | Illinois |
| XL8, Inc. | |
| XLerant | Connecticut |
| XLerateHealth | Kentucky |
| XLHost | Ohio |
| XLhub | Michigan |
| XLineSoft | Virginia |
| XLN Systems | Ohio |
| XLR8 Development, LLC | Arizona |
| XLR8 Software | Utah |
| xlrINT, LLC | Texas |
| XLsoft Corporation | California |
| Xlyme, Inc. | Colorado |
| Xman Software | California |
| XMANNA Software Technologies | |
| Xmatters | California |
| XMC, Inc. | Tennessee |
| xMD Diagnostics, Inc. | Maryland |
| Xmetryx, Inc. | Arizona |
| Xmind Ltd | |
| XMission LC | Utah |
| XML Files | California |
| XML.com | California |