The NedPhO was formed in 1985 from the merger of three orchestras: the Amsterdam Philharmonic Orchestra, the Utrecht Symphony Orchestra Utrecht and the Netherlands Chamber Orchestra. The Netherlands Chamber Orchestra (Dutch: Nederlands Kamer Orkest, NKO) continues to give concerts under its own name, with both it and the NedPhO as part of the Netherlands Philharmonic Orchestra Foundation (Stichting Nederlands Philharmonisch Orkest), which is headquartered in Amsterdam. The NedPhO Foundation comprises the largest orchestra organisation in the Netherlands, with 130 musicians on staff.