| Supergonk | — | 1 | 1 |
| Superior Software | 1982 | — | 1 |
| Superscape | 1983 | 4 | — |
| Supersonic Software | 1989 | 1 | — |
| Suspicious Developments | 2012 | 1 | 1 |
| Swordfish Studios | 2002 | 1 | — |
| System 3 | 1984 | 6 | 4 |
| Tag Games | 2006 | 2 | — |
| Team Soho | 1994 | 2 | — |
| Team17 | December 1990 | 39 | 53 |
| Telstar Electronic Studios | 1993 | — | 1 |
| Thalamus Ltd | 1986 | — | 2 |
| That Silly Studio | December 7, 2016 | 1 | — |
| The Adventure Workshop | 1992 | — | 1 |
| The Assembly Line | 1989 | 1 | — |
| The Bitmap Brothers | 1987 | 3 | — |
| The Chinese Room | 2007 | 2 | — |
| The Code Monkeys | 1988 | 2 | — |
| The Dairymen | September 26, 2000 | — | 1 |
| The Digital Village | 1994 | 1 | — |
| The Fighter Collection | — | — | 1 |
| The Game Creators | 1999 | — | — |
| The Sales Curve | 1988 | — | 3 |
| THQ Digital Studios UK | 2003 | 3 | — |
| Three Fields Entertainment | 2014 | 2 | 1 |
| Tiertex Design Studios | 1987 | 5 | — |
| Time Warner Interactive Ltd. | September 23, 1988 | 1 | 1 |
| Traveller's Tales | 1989 | 29 | — |
| TT Fusion | 2006 | 6 | — |
| TT Games | 2005 | 7 | 3 |
| TT Games Publishing | 2004 | — | 1 |
| Two Point Studios | 2016 | 1 | — |
| U.S. Gold | 1984 | 1 | 19 |
| Ubisoft Leamington | 2002 | 4 | — |
| Ubisoft Reflections | 1984 | 15 | — |
| Ultimate Play the Game | 1982 | — | 3 |
| Upstream Arcade | February 4, 2020 | 1 | — |
| UTV Ignition Games | 2002 | — | 4 |
| Vektor Grafix | 1986 | 3 | — |
| Vikerlane | — | 1 | — |
| Virgin Media | 1984 | 1 | — |
| Virtual Playground | — | 5 | — |
| VIS Entertainment | 1996 | 3 | — |
| Visual Sciences | 1993 | 2 | — |
| Volatile Games | 2006 | 1 | — |
| Vortex Software | 1982 | 1 | 2 |
| Vulcan Software | January 5, 1994 | 3 | 2 |
| White Paper Games | June 28, 2012 | 1 | — |
| Wired Productions | May 15, 2008 | — | 7 |
| Wolf & Wood | January 28, 2015 | 2 | — |
| Wreck Tangle Games | — | 1 | 1 |
| Yogscast Games | — | — | 4 |
| YoYo Games | 2007 | — | — |
| ZeptoLab | 2010 | 6 | 5 |
| Zoo Digital (United Kingdom) | — | 1 | — |
| Zoë Mode | 2007 | 9 | — |
| Zushi Games | 1999 | 1 | 10 |