Matt Parry will move to GP3 with Koiranen GP in 2015, joining Jimmy Eriksson and Adderly Fong at the Finnish squad.
Parry, 21, steps up to GP3 after two years in Formula Renault 2.0 Eurocup.
Swede Eriksson stays with the team for a second consecutive season after finishing fourth in last year's championship.
Fong, meanwhile, joins Koiranen from Jenzer Motorsport, which has announced Matheo Tuscher and Ralph Boschung as its drivers for 2015.
Tuscher already raced with Jenzer in 2014, while Boschung joins the squad after competing in the ADAC Formula Masters series.
Marvin Kirchhofer will also stay with the team he drove for last year - ART - after the French squad confirmed him as Alfonso Celis' teammate.