Guerrilla B.V. (trade name: Guerrilla Games) is a Dutch first-party video game developer based in Amsterdam and part of PlayStation Studios. The company was founded as Lost Boys Games in January 2000 through the merger of three smaller development studios as a subsidiary of multimedia conglomerate company Lost Boys. Lost Boys Games became independent the following year and was acquired by Media Republic in 2003, renaming the studio to Guerrilla Games before being purchased by Sony Interactive Entertainment in 2005. As of June 2021, the company employs 360 people under the leadership of joint studio heads Angie Smets, Jan-Bart van Beek, and Michiel van der Leeuw. It is best known for the Killzone and Horizon game series. History Guerrilla is the result of a merger between three Dutch video game studios: Orange Games, Digital Infinity, and Formula Game Development. Orange Games was founded in 1993 by Arjan Brussee, the co-designer of the 1994 game Jazz Jackrabbit; Digital Infinity was founded by Arnout van der Kamp in 1995; and Formula was founded by Martin de Ronde in 1998 and sold to Lost Boys (a multimedia conglomerate company owned by Michiel Mol) in 1999. The three studios merged, forming Lost Boys Games as a subsidiary of Lost Boys on 1 January 2000. With de Ronde as managing director, the new company employed 25 people, growing to 40 by November 2000. Hermen Hulst was hired from a consulting firm to replace de Ronde as managing director the following year. In 2001, when Lost Boys merged with Swedish media company IconMediaLab, Lost Boys Games was spun off into an independent entity, though under the continued ownership of Mol. Lost Boys Games began developing Game Boy Color games with original characters, but the studio found that publishers would rather release games including licensed characters. Because the studio did not want to compromise on significantly altering the characters it had created, it was unable to find a publisher for them. Consequently, Lost Boys Games moved on to work-for-hire projects, creating four handheld games: Dizzy's Candy Quest (Game Boy Color, 2001), Rhino Rumble (Game Boy Color, 2002), Black Belt Challenge (Game Boy Advance, 2002), and Invader (Game Boy Advance, 2002). The latter two games were published by Xicat Interactive. Mol later established a new media company, Media Republic, which acquired 75% of Lost Boys Games in 2003. Shortly thereafter, in July 2003, Lost Boys Games was renamed