According to documents, Rockstar parent Take-Two has taken a controlling stake in the company (more than 75%) and changed its registered address to the GTA firm’s London HQ.
Ruffian announced last year that it was working on multiple games alongside Grand Theft Auto developer Rockstar.
The studio is home to developers who have worked on both the Manhunt and Grand Theft Auto series.
The Dundee developer is best known for 2010’s Crackdown 2, as well as supplementary work on Kinect Star Wars, Halo: The Master Chief Collection and Crackdown 3: Wrecking Zone.
A recent Kotaku report claimed work on the unannounced next GTA title was “still early in development” and that it could be “moderately sized” upon release, partly to reduce employee stress and crunch, before being regularly expanded over time.