| name | games | status | region | founded | closed | activity | |
|---|
| Big John Games |
10 | | | | | 2010/2015 | |
| Bohemia Interactive |
32 | active | CS | 1999 | | 2001/2019 | HQ: Prague, Czech Republic Website: http://www.bistudio.com Acquired Altar Games … |
| DaiOhjyo |
2 | | | 2001 | | 2001/2002 | |
| Donohoe Digital |
4 | | | | | 2003/2004 | |
| duplicate: Bohemia Interactive Studio |
2 | | | | | 2003/2007 | |
| Haoh |
5 | | JAP | 2004 | | 2001/2006 * | |
| John Sands Electronics |
15 | | AU | 1837 | | 1983/1984 | John Sands (Australia) Ltd. produces and distributes greeting cards in Australasia … |
| John Tiller Software |
| | | | | | |
| Johnson Scanatron Ltd |
2 | | | | | 1986/1987 | |
| Kohgakusha |
3 | active | JP | 1976 | | 1980/1982 | Foremost a magazine and book company specialized on IT print media. Most famous … |
| Microhobby Cassette |
6 | | | | | 1985/1990 | |
| New System House Oh ! |
3 | | | | | 1988/1988 | |
| OHBA-Do |
4 | | | | | 2002/2002 | |
| Ohio Scientific |
52 | bought | US | 1975 | 1981 | 1977/1981 | Ohio Scientific, Inc. Ohio Scientific Instruments, Ohio Scientific of Puerto Rico … |
| SYSTEM HOUSE OH! |
13 | | | | | 1987/1991 | |
| Team SOHO |
3 | | | | | 2001/2004 | |
| Toho |
28 | active | JP | 1932 | | 1984/1998 | Mainly a film company, most famous for its Godzilla movies. |
| Tohoku Shinsha |
6 | | | | | 1996/1998 | |
| Wokoha |
1 | | US | | | | |
| XenoHorizon |
1 | | | | | 2014/2014 | |
| YOH |
2 | | | | | 1989/1990 | |
| Yohan Games |
4 | | | | | 2013/2013 | |
