| Company | Type | Based in | Founded |
|---|---|---|---|
| XBIZ | business, online magazine | Los Angeles | 1998 |
| Xcel Energy | business, public company | Minneapolis | 1998 |
| XFX | business | Ontario, California | 1989 |
| Xilinx | business, enterprise | San Jose | 1984 |
| Ximian | business, enterprise | Boston | October 19, 1999 |
| XPO, Inc. | logistics company, business, enterprise, public company | Greenwich | 1987 |
| XYZ Films | film studio | Los Angeles | 2008 |