Chambers of Commerce creating the Forum
- Chamber of Commerce of the Płock Region
- Chamber of Commerce and Industry of the Radom Region
- Mazowiecka Chamber of Commerce in Ciechanów
- Ostrowska Izba Rolno-Przemysłowa
- Płońska Izba Gospodarcza
- Poviat Economic Chamber in Sochaczew
- Poviat Chamber of Commerce in Legionowo
- Warsaw Chamber of Commerce
- Eastern Chamber of Commerce in Siedlce