| Name | Types | |
|---|---|---|
| SCEJ | DeveloperPublisher | |
| SCI | Publisher | |
| SCI Entertainment Group | Developer | |
| SCI Games | Developer | |
| SCR Adventures | Publisher | |
| SCREAM CATALOGUE | Developer | |
| SCRNPRNT | Developer | |
| SCS Software | DeveloperPublisher | |
| SCaffa | Developer | |
| SCi | DeveloperPublisher | |
| SCi Entertainment | Publisher | |
| SCi Games | Publisher | |
| SCi Games Ltd. | Publisher | |
| SCi GamesEU | Publisher | |
| SCiEU | Publisher | |
| SCiPAL | Publisher | |
| SDR Project | Publisher | |
| SE Mobile and Online | Publisher | |
| SE Software | Developer | |
| SE77E | Developer | |
| SEAROM | Developer | |
| SEEC | DeveloperPublisher | |
| SEGA | DeveloperPublisher | |
| SEGA Enterprises | Publisher | |
| SEGA Racing Studio | Developer | |
| SEGA-AM3 | Developer | |
| SEGARIO | Developer | |
| SEK | Developer | |
| SEMISOFT | Developer | |
| SENOME | Developer | |
| SEP BOA | Developer | |
| SEQUENTIA SOFT | Developer | |
| SERPA GAMES | Developer | |
| SETA | DeveloperPublisher | |
| SETA (JP/NA) | Publisher | |
| SETA Corporation | DeveloperPublisher | |
| SETA Corporation JP | Publisher | |
| SETA CorporationJP | Publisher | |
| SETA/ | Publisher | |
| SETENTIA Studios | Developer | |
| SETOOK | Developer | |
| SF.net | DeveloperPublisher | |
| SF1252 | Developer | |
| SFB Games | DeveloperPublisher | |
| SFBGames | Developer | |
| SFL Interactive | Developer | |
| SG Diffusion | Developer | |
| SG Morumbi | Developer | |
| SGI | Developer | |
| SHADOW BEAST | Developer |