RSJ is a registered licensed investment firm based in Prague pursuing business activities in asset management. Focusing on trading financial derivatives, RSJ is an active market maker facilitating easier trading for other exchange participants.

RSJ is an official market maker on ICE Futures Europe with an obligation to perform this role throughout almost the entire trading day, an official market maker on CME (Chicago Mercantile Exchange) and a member and major trader on Eurex (a German derivatives exchange based in Frankfurt am Main).