| 'X' Companies | Period (Timeline) | Item #: Game | Item #: Non-Game |
|---|---|---|---|
| X Plus | 2021 to 2023 (3 years) | ||
| X-Factor | 1989 to 1992 (4 years) | ||
| X-Infra [Korea] | 2002 (1 year) | ||
| X-Large | 1991 (1 year) | ||
| X-line | 2007 (1 year) | ||
| X-Out | 1989 to 1990 (2 years) | ||
| X-Rated | 1987 to 1999 (13 years) | ||
| X-Soft | 1988 to 1989 (2 years) | ||
| X-Static | 1992 (1 year) | ||
| X-Works | 1993 (1 year) | ||
| Xain Soft. [Japan] | 1987 to 1989 (3 years) | ||
| Xanaro Technologies | 1985 (1 year) | ||
| Xatrix Ent., Inc. | 1993 (1 year) | ||
| Xavier Orion Games | 2017 (1 year) | ||
| Xaviersine Audio Products | 1984 to 1985 (2 years) | ||
| XCEL | 2005 (1 year) | ||
| Xcellent Soft. | 1986 (1 year) | ||
| XDF [Japan] | 1992 (1 year) | ||
| Xdra, Ltd. | 1993 to 1995 (3 years) | ||
| Xeneder Team | 2023 (1 year) | ||
| Xenex | |||
| XenoHorizon | 2014 (1 year) | ||
| Xentrix | 1990 to 1991 (2 years) | ||
| Xerox | 1973 to 1988 (16 years) | ||
| XEST PD [Austria] | |||
| Xetec | 1987 (1 year) | ||
| Xex [Japan] | 1986 (1 year) | ||
| XianFeng Katong [China] | 1996 (1 year) | ||
| Xicat Interactive | 2000 to 2003 (4 years) | ||
| Xin Xin | 2016 (1 year) | ||
| Xing Ent. [Japan] | 1994 to 2001 (8 years) | ||
| Xing Li [China] | 2011 (1 year) | ||
| XingXing [China] | |||
| Xinyu Games [China] | 2010 (1 year) | ||
| Xiphias | 1991 to 1993 (3 years) | ||
| XL Coin Machine Co., Inc. [Boston, MA, USA] | 1938 (1 year) | ||
| XL2S Ent. | 2005 (1 year) | ||
| Xland Computer Games | 1991 to 1995 (5 years) | ||
| XLsoft International | 1988 (1 year) | ||
| Xonox, Inc. [Hopkins, MN, USA] | 1983 to 1984 (2 years) | ||
| XOR | 1985 to 1993 (9 years) | ||
| XORsoft | 1984 (1 year) | ||
| Xortrapa Soft. [Spain] | 1990 (1 year) | ||
| XPEC Ent., Inc. [China] | 2013 (1 year) | ||
| Xplosive | 1996 to 2008 (13 years) | ||
| Xplosive Slots | |||
| Xray [Japan] | 1994 to 1997 (4 years) | ||
| XS Games | 2002 to 2010 (9 years) | ||
| XSEED Games | 2006 to 2024 (19 years) | ||
| XSIV Games [Stealth Productions] | 1999 (1 year) | ||
| Xtal Soft. [Japan] | 1982 to 1990 (9 years) | ||
| Xuse | 1998 (1 year) | ||
| Xxxxxxxx Corp. [Korea] | 2003 (1 year) | ||
| XYPE | 2003 (1 year) | ||
| XYZ [Japan] | 1994 to 1996 (3 years) |