2K Studios

Name	Years active (as a 2K studio)	Notes
Firaxis Games	2005–present	Acquired on November 7, 2005.[3]
Irrational Games	2006–present	Previously known as 2K Boston/Australia of BioShock fame.
2K Marin	2007–present	A new studio consisting of some former employees from Irrational Games. They ported BioShock to the PlayStation 3 and also developed BioShock 2 for the Xbox 360, PlayStation 3 and PC.
2K China	2006–present	Most commonly known as 2K China.
Visual Concepts	2005–present	Develops 2K Sports titles.
Cat Daddy Games	2005–present	Develops 2K Play titles.
2K Czech	2008–present	Previously known as Illusion Softworks of Mafia fame. The last game is Mafia II.
Frog City Software	2005–2006	Was consolidated into Firaxis Games.[4]
Indie Built	2004–2006	Previously owned by Microsoft. Closed on April 28, 2006.[5]
Venom Games	2004–2008	Created Don King Presents: Prizefighter.
PopTop Software	1993–2006	Was consolidated into Firaxis Games.[4]