| Bushiroad | 2007 | 1 | 8 |
| Bushiroad Games | — | — | 2 |
| Byking | — | 1 | — |
| Cabbage Soft | — | 4 | 3 |
| Camelot Software Planning | April 4, 1994 | 27 | 1 |
| Candy Soft | — | 4 | 2 |
| Capcom | May 30, 1979 | 230 | 261 |
| Capcom Production Studio 4 | 1999 | 1 | — |
| Caramel Box | — | 4 | 4 |
| Career Soft | June 1996 | 13 | — |
| Carry Lab | 1981 | 2 | — |
| Catear | — | 2 | 2 |
| Cattle Call | March 20, 1998 | 5 | — |
| CAVE | June 15, 1994 | 18 | 6 |
| Cavia | March 2000 | 15 | — |
| Cavyhouse | — | 3 | — |
| CD Bros. | 1994 | — | 1 |
| Cellius | 2007 | 1 | — |
| Chilla's Art | — | 16 | 16 |
| Chiyomaru Studio | — | 2 | — |
| Chorus Worldwide | — | — | 9 |
| Chunsoft | 1984 | 25 | 5 |
| Cing | April 22, 1999 | 1 | — |
| Circus | 2000 | 5 | 2 |
| City Connection | April 2005 | 20 | 22 |
| Clap Hanz | April 2, 1998 | 9 | 1 |
| Claytechworks | July 4, 2018 | 1 | — |
| Climax Entertainment | 1990 | 2 | — |
| Clochette | — | 1 | 1 |
| Clockup | 2002 | 4 | 4 |
| Clover Studio | July 2004 | 1 | — |
| Coconuts Japan | November 1985 | 1 | 1 |
| Colorful Palette | June 2018 | 1 | — |
| Cooking Mama Limited | — | 8 | — |
| COSEN Co., Ltd. | 2014 | — | 9 |
| COVER Corporation | June 13, 2016 | 1 | 2 |
| Crea-Tech | 1988 | 4 | — |
| Creatures | November 8, 1995 | 11 | 3 |
| CRI Middleware | August 2001 | 2 | — |
| CROOZ | May 24, 2001 | 1 | — |
| Crossnet | September 1999 | — | 1 |
| Crosstalk Inc. | October 1979 | 1 | — |
| Crowd | — | 5 | 5 |
| Crypton Future Media | July 1995 | 6 | 3 |
| CTW Inc. | August 14, 2013 | — | 4 |
| CUFFS | 2005 | 2 | 4 |
| Culture Brain | 1980 | 7 | 4 |
| Culture Publishers | — | — | 1 |
| CyberConnect2 | February 16, 1996 | 31 | 3 |
| CyberFront | 1998 | — | 3 |
| CyberStep Holdings | April 2000 | 2 | 5 |
| CyberWorks | — | 1 | 1 |
| Cyclone Zero | July 2007 | 4 | — |
| Cygames | 2011 | 8 | 7 |
| D-Rockets | October 7, 2008 | 1 | — |
| Dangen Entertainment | 2017 | — | 10 |
| Data East | April 20, 1976 | 23 | 21 |
| DATA WEST | May 26, 1986 | 3 | 3 |
| Datam Polystar | May 30, 1990 | 3 | 8 |
| Debonosu Works | — | 2 | — |
| Degica | June 13, 2005 | 1 | 4 |
| Delightworks | — | — | 1 |
| DeNA | March 1999 | 6 | 1 |
| Design Factory | April 2, 2001 | 12 | — |
| Dico | 2011 | 1 | — |
| DigiCube | February 6, 1996 | — | 3 |
| Dimps | March 6, 2000 | 40 | — |
| Dingo Inc. | 1998 | 4 | — |
| Discovery | — | 1 | 1 |
| DMM.com | November 17, 1999 | 1 | 4 |
| Dragami Games | May 13, 2022 | 1 | — |
| Dramatic Create | — | 1 | 7 |
| DreamFactory | 1995 | 5 | — |
| Dwango | August 6, 1997 | 1 | — |
| E Frontier | 1999 | — | 1 |
| East Japan Railway Company | April 1987 | — | 1 |
| Ecole Software | March 31, 1989 | 2 | 1 |
| Edia | April 9, 1999 | — | 1 |
| Eighting | March 15, 1993 | 30 | 1 |
| Electronic Arts Victor | 1990 | — | 2 |
| ELF Corporation | April 27, 1989 | 8 | 1 |
| Enix | 1975 | 6 | 31 |
| Ensemble | — | 2 | — |
| Enterbrain | 2000 | 1 | 6 |
| Entergram | August 5, 1999 | 1 | 11 |
| Entertainment Software Publishing | 1997 | 1 | 4 |
| Epic Records Japan | August 1978 | — | 2 |
| Epoch | 1958 | — | 1 |
| Epoch Co. | May 6, 1958 | 3 | 10 |
| Escu:de | — | 2 | 2 |
| Eushully | 2005 | 10 | 3 |
| Examu | 2007 | 7 | 4 |
| Exe-Create | — | 23 | 1 |
| EXNOA | December 13, 2017 | 2 | 2 |
| Experience | April 2007 | 3 | 1 |
| F&C | March 31, 1997 | 3 | 3 |
| F4samurai | January 8, 2010 | 1 | — |
| Falcon | August 1981 | 1 | — |
| Family Soft | 1987 | 1 | 1 |
| Feelplus | 1992 | 2 | — |