Stichting Prosiris was founded in 1993 and is the legal body supporting the activities of the Osiris Trio.
The board of Stichting Prosiris consists of:
Mr Frans de Ruiter, chairman
Ms Marjon Koenekoop, secretary
Mr Evert Snel, treasurer
Stichting Prosiris is registered at the Kamer van Koophandel / Chamber of Commerce under the number 41226299
SBI-code: 6420 - Financial Holdings