| .dat | Russia | 2003 | 1 | — |
| 07th Expansion | Japan | 2000 | 14 | 5 |
| 1 Simple Game | Mexico | July 2013 | 1 | 1 |
| 1-Up Studio | Japan | June 30, 2000 | 2 | — |
| 10tacle Studios | Germany | 2003 | 1 | 3 |
| 10tons | Finland | 2003 | 5 | 5 |
| 11 Bit Studios | Poland | October 7, 2010 | 4 | 6 |
| 110 Industries | Switzerland | 2017 | — | 1 |
| 13cm | Japan | 1993 | 1 | 1 |
| 14 Degrees East | United States | March 3, 1999 | 2 | — |
| 1492 Studio | France | 2007 | 1 | — |
| 17-BIT | United States | 2009 | 1 | 1 |
| 1C Company | Russia | 1991 | 13 | 79 |
| 1C Online Games | Cyprus | May 28, 2010 | 1 | — |
| 1P2P Studio | France | January 15, 2018 | 1 | — |
| 1st Playable Productions | United States | 2005 | 3 | — |
| 2015, Inc. | United States | 1997 | 1 | — |
| 20th Century Studios | United States | 1985 | — | 1 |
| 24 Entertainment | People's Republic of China | — | 1 | — |
| 2Awesome Studio | Netherlands | 2014 | 1 | 8 |
| 2Bad Games | France | — | 1 | 1 |
| 2K | United States | January 25, 2005 | 1 | 72 |
| 2K Australia | Australia | 2000 | 3 | — |
| 2K China | People's Republic of China | 2006 | 4 | — |
| 2K Los Angeles | United States | 2002 | 6 | — |
| 2K Marin | United States | December 17, 2007 | 4 | — |
| 2K Play | United States | September 10, 2007 | — | 8 |
| 2K Sports | United States | January 25, 2005 | — | 44 |
| 2ndBoss | Brazil | — | 3 | 3 |
| 2tainment | Germany | — | 1 | 2 |
| 2XL Games | — | 2005 | 1 | — |
| 3 Sprockets | Australia | — | 1 | 1 |
| 3-Fold Games | United Kingdom | October 2016 | 1 | 1 |
| 34BigThings | Italy | May 2014 | 6 | 4 |
| 38 Studios | United States | 2006 | 2 | — |
| 3D Oyuncu | Turkey | — | 1 | — |
| 3D Realms | United States | 1994 | 6 | 13 |
| 3D-Ages | Japan | 2003 | — | 1 |
| 3d6 Games | United States | 1999 | 1 | — |
| 3DClouds | Italy | 2014 | 6 | — |
| 3Division Entertainment | Slovakia | — | 1 | — |
| 3goo | Japan | 2009 | 1 | 2 |
| 3R Games | Poland | 2010 | 1 | — |
| 3Romans | United States | — | 2 | — |
| 40 Giants Entertainment | Brazil | — | 1 | — |
| 49Games | Germany | 2004 | 2 | — |
| 4A Games | Malta | 2006 | 1 | — |
| 4J Studios | United Kingdom | 2005 | 4 | — |
| 4mm Games | United States | 2008 | 1 | — |
| 505 Games | Italy | 2006 | 2 | 47 |
| 5am Games | Switzerland | — | 1 | — |
| 5pb. Inc. | Japan | April 6, 2005 | 10 | 5 |
| 5th Cell | United States | August 28, 2003 | 8 | — |
| 7A Games | Poland | January 23, 2017 | 1 | — |
| 7th Level | United States | April 28, 1993 | 4 | 2 |
| 8-4 | Japan | October 5, 2005 | — | 1 |
| 8-Bit Legit | United States | — | — | 3 |
| 8floor | United Kingdom | December 8, 2011 | 16 | 274 |
| 989 Studios | United States | 1995 | 11 | 10 |
| 9Heads Game Studio | Brazil | — | 1 | 1 |
| [2.21] | France | August 27, 2021 | 1 | — |