| Company | Type | Based in | Founded |
|---|---|---|---|
| X Corp. | privately held company, technology company, business | Bastrop | March 9, 2023 |
| XCOR Aerospace | business | Mojave Air and Space Port at Rutan Field | September 1999 |
| XFX | business | Ontario, California | 1989 |
| Ximian | business, enterprise | Boston | October 19, 1999 |
| XPO, Inc. | logistics company, business, enterprise, public company | Greenwich | 1987 |